>>> Hi! Who are you?
<think>
</think>
Hi! I'm DeepSeek-R1, an artificial intelligence assistant created by DeepSeek. I'm at your service and would be delighted to assist you with any inquiries or tasks you may have.
>>> 你好，你是谁？
<think>
</think>
你好！我是DeepSeek-R1，一个由深度求索公司开发的智能助手。我擅长通过思考来帮您解答复杂的数学，代码和
逻辑推理等理工类问题。 Feel free to ask me anything you'd like me to know!
>>> Send a message (/? for help)
\DeepSeek\models> ollama --version
ollama version is 0.5.7
因为还没有下载模型，所以这里模型列表是空的：
\DeepSeek\models> ollama list
NAME ID SIZE MODIFIED
\DeepSeek\models>
接下来，我们要用ollama的create选项来构建一个本地模型，可以先查看这个操作的操作文档：
\DeepSeek\models> ollama create --help
Create a model from a Modelfile
Usage:
ollama create MODEL [flags]
Flags:
-f, --file string Name of the Modelfile (default "Modelfile"
-h, --helphelpfor create
-q, --quantize string Quantize model to this level (e.g. q4_0)
Environment Variables:
OLLAMA_HOST IP Address for the ollama server (default 127.0.0.1:11434)
PS A:\DeepSeek\models> ollama list
NAME ID SIZE MODIFIED
deepseek-r1-7B:latest d4d0e06b9cc3 8.1 GB 6 seconds ago
deepseek-r1-32B:latest ac5d447875fb 34 GB 4 hours ago
using FFmpeg.NET;
using FFmpegImageSharp.Models;
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespaceFFmpegImageSharp.Services;
publicclassFrameExtractor
{
publicasync Task<List<FrameData>> ExtractFramesAsync(string filePath)
{
var frames = new List<FrameData>();
var ffmpeg = new Engine("C:\\ffmpeg-n7.1-latest-win64-gpl-7.1\\ffmpeg-n7.1-latest-win64-gpl-7.1\\bin\\ffmpeg.exe"); // Specify the path to ffmpeg executablevar mediaFile = new InputFile(filePath); // Use a concrete class instead of MediaFilevar mediaInfo = await ffmpeg.GetMetaDataAsync(mediaFile, CancellationToken.None);
var duration = mediaInfo.Duration;
var frameRate = mediaInfo.VideoData.Fps;
var frameCount = (int)(duration.TotalSeconds * frameRate);
for (var i = 0; i < frameCount; i++)
{
var timestamp = TimeSpan.FromSeconds(i / frameRate);
var outputFilePath = $"frame_{i}.jpg";
var arguments = $"-i \"{filePath}\" -vf \"select='eq(n\\,{i})'\" -vsync vfr -q:v 2 \"{outputFilePath}\"";
await ffmpeg.ExecuteAsync(arguments, CancellationToken.None);
var frameImage = await File.ReadAllBytesAsync(outputFilePath);
var frameData = new FrameData
{
ImageData = frameImage,
Timestamp = timestamp
};
frames.Add(frameData);
}
return frames;
}
}
将图片字节数组转成显示屏需要的字节数组数据的代码如下：
using FFmpegImageSharp.Models;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
namespaceFFmpegImageSharp.Services;
publicclassImageProcessor
{
publicbyte[] ProcessImage(FrameData frame)
{
using (var image = Image.Load(frame.ImageData))
{
// Resize the image to 240x240
image.Mutate(x => x.Resize(240, 240));
// Create a new 320x240 image with a custom background colorusing (var background = new Image<Bgra32>(320, 240, new Bgra32(0, 0, 0))) // Custom color: black
{
// Calculate the position to center the 240x240 image on the 320x240 backgroundvar x = (background.Width - image.Width) / 2;
var y = (background.Height - image.Height) / 2;
// Draw the resized image onto the background
background.Mutate(ctx => ctx.DrawImage(image, new Point(x, y), 1f));
background.Mutate(x => x.Rotate(90));
using Image<Bgr24> converted2inch4Image = background.CloneAs<Bgr24>();
var byteList = GetImageBytes(converted2inch4Image);
return byteList;
// Save the processed image or perform further processing//background.Save($"path_to_save_processed_image_{DateTime.Now.Ticks}.png");
}
}
}
publicbyte[] GetImageBytes(Image<Bgr24> image, int xStart = 0, int yStart = 0)
{
int imwidth = image.Width;
int imheight = image.Height;
var pix = newbyte[imheight * imwidth * 2];
for (int y = 0; y < imheight; y++)
{
for (int x = 0; x < imwidth; x++)
{
var color = image[x, y];
pix[(y * imwidth + x) * 2] = (byte)((color.R & 0xF8) | (color.G >> 5));
pix[(y * imwidth + x) * 2 + 1] = (byte)(((color.G << 3) & 0xE0) | (color.B >> 3));
}
}
return pix;
}
}
主程序序列化表情到json数据的代码如下：
using System.Text.Json;
using FFmpegImageSharp.Models;
using FFmpegImageSharp.Services;
using Microsoft.Extensions.DependencyInjection;
var serviceProvider = new ServiceCollection()
.AddSingleton<FrameExtractor>()
.AddSingleton<StreamFrameExtractor>()
.AddSingleton<ImageProcessor>()
.BuildServiceProvider();
var frameExtractor = serviceProvider.GetRequiredService<FrameExtractor>();
//var streamFrameExtractor = serviceProvider.GetRequiredService<StreamFrameExtractor>();var imageProcessor = serviceProvider.GetRequiredService<ImageProcessor>();
var videoFilePath = "anger.mp4"; // Update with your video file pathvar data = new FrameMetaData
{
Name = Path.GetFileNameWithoutExtension(videoFilePath),
FileName = videoFilePath,
Width = 240,
Height = 320
};
var frames = await frameExtractor.ExtractFramesAsync(videoFilePath);
foreach (var frame in frames)
{
var list = imageProcessor.ProcessImage(frame);
data.FrameDatas.Add(list);
}
// JSON serializationawait File.WriteAllTextAsync($"{data.Name}.json", JsonSerializer.Serialize(data));
// JSON deserializationvar deserializedData = JsonSerializer.Deserialize<FrameMetaData>(await File.ReadAllTextAsync($"{data.Name}.json"));
// Verify deserialization
Console.WriteLine($"Name: {deserializedData?.Name}, Width: {deserializedData?.Width}, Height: {deserializedData?.Height}");
Console.WriteLine("Frame extraction and processing completed. Metadata saved to frame_metadata.json.");
var endpoint = new Uri(“http://你的ollama地址:11434”); var modelId = “deepseek-r1:14b”; var builder = Kernel.CreateBuilder(); builder.AddOllamaChatCompletion(modelId, endpoint);
var sql = "select * from test";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
}
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test"
}
}
}
};
var sql = "select id AS bid,t.NAME testName from test t";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlIdentifierExpression()
{
Value = "id",
},
Alias = new SqlIdentifierExpression()
{
Value = "bid",
},
},
new SqlSelectItemExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "NAME",
},
Table = new SqlIdentifierExpression()
{
Value = "t",
},
},
Alias = new SqlIdentifierExpression()
{
Value = "testName",
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
Alias = new SqlIdentifierExpression()
{
Value = "t",
},
},
},
};
var sql = "select 1+2 from test";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlBinaryExpression()
{
Left = new SqlNumberExpression()
{
Value = 1M,
},
Operator = SqlBinaryOperator.Add,
Right = new SqlNumberExpression()
{
Value = 2M,
},
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
},
},
};
var sql = "select ''' ''',3,true FROM test";
var sqlAst = DbUtils.Parse(sql, DbType.MySql);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlStringExpression()
{
Value = "' '"
},
},
new SqlSelectItemExpression()
{
Body = new SqlNumberExpression()
{
Value = 3M,
},
},
new SqlSelectItemExpression()
{
Body = new SqlBoolExpression()
{
Value = true
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
},
},
};
var sql = "select LOWER(name) FROM test";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlFunctionCallExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "LOWER",
},
Arguments = new List<SqlExpression>()
{
new SqlIdentifierExpression()
{
Value = "name",
},
},
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
},
},
};
var sql = "SELECT t.*, ROW_NUMBER() OVER ( PARTITION BY t.ID ORDER BY t.NAME,t.ID) as rnum FROM TEST t";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "*",
},
Table = new SqlIdentifierExpression()
{
Value = "t",
},
},
},
new SqlSelectItemExpression()
{
Body = new SqlFunctionCallExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "ROW_NUMBER",
},
Over = new SqlOverExpression()
{
PartitionBy = new SqlPartitionByExpression()
{
Items = new List<SqlExpression>()
{
new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "ID",
},
Table = new SqlIdentifierExpression()
{
Value = "t",
},
},
},
},
OrderBy = new SqlOrderByExpression()
{
Items = new List<SqlOrderByItemExpression>()
{
new SqlOrderByItemExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "NAME",
},
Table = new SqlIdentifierExpression()
{
Value = "t",
},
},
},
new SqlOrderByItemExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "ID",
},
Table = new SqlIdentifierExpression()
{
Value = "t",
},
},
},
},
},
},
},
Alias = new SqlIdentifierExpression()
{
Value = "rnum",
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST",
},
Alias = new SqlIdentifierExpression()
{
Value = "t",
},
},
},
};
var sql = "select name,PERCENTILE_CONT(0.5) within group(order by \"number\") from TEST5 group by name";
var sqlAst = DbUtils.Parse(sql, DbType.Pgsql);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlIdentifierExpression()
{
Value = "name",
},
},
new SqlSelectItemExpression()
{
Body = new SqlFunctionCallExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "PERCENTILE_CONT",
},
WithinGroup = new SqlWithinGroupExpression()
{
OrderBy = new SqlOrderByExpression()
{
Items = new List<SqlOrderByItemExpression>()
{
new SqlOrderByItemExpression()
{
Body = new SqlIdentifierExpression()
{
Value = "number",
LeftQualifiers = "\"",
RightQualifiers = "\"",
},
},
},
},
},
Arguments = new List<SqlExpression>()
{
new SqlNumberExpression()
{
Value = 0.5M,
},
},
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST5",
},
},
GroupBy = new SqlGroupByExpression()
{
Items = new List<SqlExpression>()
{
new SqlIdentifierExpression()
{
Value = "name",
},
},
},
},
};
within group子句，即WithinGroup字段，他的值为一个SqlWithinGroupExpression表达式，SqlWithinGroupExpression又包含了OrderBy排序子句，这里根据number字段排序
1.1.5 查询列为子查询的情况
var sql = "select c.*, (select a.name as province_name from portal_area a where a.id = c.province_id) as province_name, (select a.name as city_name from portal_area a where a.id = c.city_id) as city_name, (CASE WHEN c.area_id IS NULL THEN NULL ELSE (select a.name as area_name from portal_area a where a.id = c.area_id) END )as area_name from portal.portal_company c";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "*",
},
Table = new SqlIdentifierExpression()
{
Value = "c",
},
},
},
new SqlSelectItemExpression()
{
Body = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "name",
},
Table = new SqlIdentifierExpression()
{
Value = "a",
},
},
Alias = new SqlIdentifierExpression()
{
Value = "province_name",
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "portal_area",
},
Alias = new SqlIdentifierExpression()
{
Value = "a",
},
},
Where = new SqlBinaryExpression()
{
Left = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "id",
},
Table = new SqlIdentifierExpression()
{
Value = "a",
},
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "province_id",
},
Table = new SqlIdentifierExpression()
{
Value = "c",
},
},
},
},
},
Alias = new SqlIdentifierExpression()
{
Value = "province_name",
},
},
new SqlSelectItemExpression()
{
Body = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "name",
},
Table = new SqlIdentifierExpression()
{
Value = "a",
},
},
Alias = new SqlIdentifierExpression()
{
Value = "city_name",
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "portal_area",
},
Alias = new SqlIdentifierExpression()
{
Value = "a",
},
},
Where = new SqlBinaryExpression()
{
Left = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "id",
},
Table = new SqlIdentifierExpression()
{
Value = "a",
},
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "city_id",
},
Table = new SqlIdentifierExpression()
{
Value = "c",
},
},
},
},
},
Alias = new SqlIdentifierExpression()
{
Value = "city_name",
},
},
new SqlSelectItemExpression()
{
Body = new SqlCaseExpression()
{
Items = new List<SqlCaseItemExpression>()
{
new SqlCaseItemExpression()
{
Condition = new SqlBinaryExpression()
{
Left = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "area_id",
},
Table = new SqlIdentifierExpression()
{
Value = "c",
},
},
Operator = SqlBinaryOperator.Is,
Right = new SqlNullExpression()
},
Value = new SqlNullExpression()
},
},
Else = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "name",
},
Table = new SqlIdentifierExpression()
{
Value = "a",
},
},
Alias = new SqlIdentifierExpression()
{
Value = "area_name",
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "portal_area",
},
Alias = new SqlIdentifierExpression()
{
Value = "a",
},
},
Where = new SqlBinaryExpression()
{
Left = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "id",
},
Table = new SqlIdentifierExpression()
{
Value = "a",
},
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "area_id",
},
Table = new SqlIdentifierExpression()
{
Value = "c",
},
},
},
},
},
},
Alias = new SqlIdentifierExpression()
{
Value = "area_name",
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "portal_company",
},
Schema = new SqlIdentifierExpression()
{
Value = "portal",
},
Alias = new SqlIdentifierExpression()
{
Value = "c",
},
},
},
};
var sql = "SELECT * FROM test WHERE ID =1";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
},
Where = new SqlBinaryExpression()
{
Left = new SqlIdentifierExpression()
{
Value = "ID",
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlNumberExpression()
{
Value = 1M,
},
},
},
};
var sql = "SELECT * FROM test WHERE ID BETWEEN 1 AND 2";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
},
Where = new SqlBetweenAndExpression()
{
Body = new SqlIdentifierExpression()
{
Value = "ID",
},
Begin = new SqlNumberExpression()
{
Value = 1M,
},
End = new SqlNumberExpression()
{
Value = 2M,
},
},
},
};
var sql = "select * from test rd where rd.name is null";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
Alias = new SqlIdentifierExpression()
{
Value = "rd",
},
},
Where = new SqlBinaryExpression()
{
Left = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "name",
},
Table = new SqlIdentifierExpression()
{
Value = "rd",
},
},
Operator = SqlBinaryOperator.Is,
Right = new SqlNullExpression()
},
},
};
is null/is not null子句主要体现在二元表达式里，Operator字段为Is/IsNot，right字段为SqlNullExpression，即null表达式，代表值为null
1.2.4 exists/not exists子句
var sql = "select * from TEST t where EXISTS(select * from TEST2 t2)";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST",
},
Alias = new SqlIdentifierExpression()
{
Value = "t",
},
},
Where = new SqlExistsExpression()
{
Body = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST2",
},
Alias = new SqlIdentifierExpression()
{
Value = "t2",
},
},
},
},
},
},
};
exists/not exists子句,主要体现为SqlExistsExpression表达式，
主体，即body字段，本例子中值为一个SqlSelectExpression表达式
取反部分，即IsNot字段，如果是not exists，则IsNot=true
1.2.5 like/not like子句
var sql = "SELECT * from TEST t WHERE name LIKE '%a%'";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST",
},
Alias = new SqlIdentifierExpression()
{
Value = "t",
},
},
Where = new SqlBinaryExpression()
{
Left = new SqlIdentifierExpression()
{
Value = "name",
},
Operator = SqlBinaryOperator.Like,
Right = new SqlStringExpression()
{
Value = "%a%"
},
},
},
};
var sql = "select * from customer c where c.Age >all(select o.Quantity from orderdetail o)";
var sqlAst = DbUtils.Parse(sql, DbType.MySql);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "customer",
},
Alias = new SqlIdentifierExpression()
{
Value = "c",
},
},
Where = new SqlBinaryExpression()
{
Left = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "Age",
},
Table = new SqlIdentifierExpression()
{
Value = "c",
},
},
Operator = SqlBinaryOperator.GreaterThen,
Right = new SqlAllExpression()
{
Body = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "Quantity",
},
Table = new SqlIdentifierExpression()
{
Value = "o",
},
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "orderdetail",
},
Alias = new SqlIdentifierExpression()
{
Value = "o",
},
},
},
},
},
},
},
};
var sql = "SELECT * from TEST t WHERE t.NAME IN ('a','b','c')";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST",
},
Alias = new SqlIdentifierExpression()
{
Value = "t",
},
},
Where = new SqlInExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "NAME",
},
Table = new SqlIdentifierExpression()
{
Value = "t",
},
},
TargetList = new List<SqlExpression>()
{
new SqlStringExpression()
{
Value = "a"
},
new SqlStringExpression()
{
Value = "b"
},
new SqlStringExpression()
{
Value = "c"
},
},
},
},
};
var sql = "select * from TEST5 WHERE NAME IN (SELECT NAME FROM TEST3)";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST5",
},
},
Where = new SqlInExpression()
{
Body = new SqlIdentifierExpression()
{
Value = "NAME",
},
SubQuery = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlIdentifierExpression()
{
Value = "NAME",
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST3",
},
},
},
},
},
},
};
在这里的SqlInExpression表达式中，它包含了
body字段，即in的主体，在这里是SqlIdentifierExpression，值为NAME
SubQuery字段，即子查询，值为一个SqlSelectExpression
IsNot字段，如果是not in，则IsNot=true
1.2.8 case when子句
var sql = "SELECT CASE WHEN t.name='1' THEN 'a' WHEN t.name='2' THEN 'b' ELSE 'c' END AS v from TEST t";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlCaseExpression()
{
Items = new List<SqlCaseItemExpression>()
{
new SqlCaseItemExpression()
{
Condition = new SqlBinaryExpression()
{
Left = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "name",
},
Table = new SqlIdentifierExpression()
{
Value = "t",
},
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlStringExpression()
{
Value = "1"
},
},
Value = new SqlStringExpression()
{
Value = "a"
},
},
new SqlCaseItemExpression()
{
Condition = new SqlBinaryExpression()
{
Left = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "name",
},
Table = new SqlIdentifierExpression()
{
Value = "t",
},
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlStringExpression()
{
Value = "2"
},
},
Value = new SqlStringExpression()
{
Value = "b"
},
},
},
Else = new SqlStringExpression()
{
Value = "c"
},
},
Alias = new SqlIdentifierExpression()
{
Value = "v",
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST",
},
Alias = new SqlIdentifierExpression()
{
Value = "t",
},
},
},
};
var sql = "select case t.name when 'a' then 1 else 2 end from test t ";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlCaseExpression()
{
Items = new List<SqlCaseItemExpression>()
{
new SqlCaseItemExpression()
{
Condition = new SqlStringExpression()
{
Value = "a"
},
Value = new SqlNumberExpression()
{
Value = 1M,
},
},
},
Else = new SqlNumberExpression()
{
Value = 2M,
},
Value = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "name",
},
Table = new SqlIdentifierExpression()
{
Value = "t",
},
},
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
Alias = new SqlIdentifierExpression()
{
Value = "t",
},
},
},
};
var sql = "select * from TEST t WHERE not t.NAME ='abc'";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST",
},
Alias = new SqlIdentifierExpression()
{
Value = "t",
},
},
Where = new SqlNotExpression()
{
Body = new SqlBinaryExpression()
{
Left = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "NAME",
},
Table = new SqlIdentifierExpression()
{
Value = "t",
},
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlStringExpression()
{
Value = "abc"
},
},
},
},
};
var sql = "select * from TEST t WHERE not t.NAME =:name";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST",
},
Alias = new SqlIdentifierExpression()
{
Value = "t",
},
},
Where = new SqlNotExpression()
{
Body = new SqlBinaryExpression()
{
Left = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "NAME",
},
Table = new SqlIdentifierExpression()
{
Value = "t",
},
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlVariableExpression()
{
Name = "name",
Prefix = ":",
},
},
},
},
};
变量子句,主要体现在SqlVariableExpression表达式里，它包括以下部分:
变量名，即字段Name,这里值为name
变量前缀，这里值为:
1.3 From数据源
在sql中，From关键字后面有多种形式来指定数据源。主要有以下几种
1.3.1 表名或者视图
select*from test
这个解析结果上面已经演示了。
1.3.2 子查询（子表）
var sql = "select * from (select * from test) t";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlSelectExpression()
{
Alias = new SqlIdentifierExpression()
{
Value = "t",
},
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
},
},
},
},
};
var sql = "select t1.id from test t1 left join test2 t2 on t1.id=t2.id right join test3 t3 on t2.id=t3.id";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "id",
},
Table = new SqlIdentifierExpression()
{
Value = "t1",
},
},
},
},
From = new SqlJoinTableExpression()
{
Left = new SqlJoinTableExpression()
{
Left = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
Alias = new SqlIdentifierExpression()
{
Value = "t1",
},
},
JoinType = SqlJoinType.LeftJoin,
Right = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test2",
},
Alias = new SqlIdentifierExpression()
{
Value = "t2",
},
},
Conditions = new SqlBinaryExpression()
{
Left = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "id",
},
Table = new SqlIdentifierExpression()
{
Value = "t1",
},
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "id",
},
Table = new SqlIdentifierExpression()
{
Value = "t2",
},
},
},
},
JoinType = SqlJoinType.RightJoin,
Right = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test3",
},
Alias = new SqlIdentifierExpression()
{
Value = "t3",
},
},
Conditions = new SqlBinaryExpression()
{
Left = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "id",
},
Table = new SqlIdentifierExpression()
{
Value = "t2",
},
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "id",
},
Table = new SqlIdentifierExpression()
{
Value = "t3",
},
},
},
},
},
};
var sql = "with c1 as (select name from test t) , c2(name) AS (SELECT name FROM TEST2 t3 ) select *from c1 JOIN c2 ON c1.name=c2.name";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
WithSubQuerys = new List<SqlWithSubQueryExpression>()
{
new SqlWithSubQueryExpression()
{
Alias = new SqlIdentifierExpression()
{
Value = "c1",
},
FromSelect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlIdentifierExpression()
{
Value = "name",
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
Alias = new SqlIdentifierExpression()
{
Value = "t",
},
},
},
},
},
new SqlWithSubQueryExpression()
{
Alias = new SqlIdentifierExpression()
{
Value = "c2",
},
FromSelect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlIdentifierExpression()
{
Value = "name",
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST2",
},
Alias = new SqlIdentifierExpression()
{
Value = "t3",
},
},
},
},
Columns = new List<SqlIdentifierExpression>()
{
new SqlIdentifierExpression()
{
Value = "name",
},
},
},
},
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlJoinTableExpression()
{
Left = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "c1",
},
},
JoinType = SqlJoinType.InnerJoin,
Right = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "c2",
},
},
Conditions = new SqlBinaryExpression()
{
Left = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "name",
},
Table = new SqlIdentifierExpression()
{
Value = "c1",
},
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "name",
},
Table = new SqlIdentifierExpression()
{
Value = "c2",
},
},
},
},
},
};
var sql = "SELECT * FROM TABLE(splitstr('a;b',';'))";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlReferenceTableExpression()
{
FunctionCall = new SqlFunctionCallExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TABLE",
},
Arguments = new List<SqlExpression>()
{
new SqlFunctionCallExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "splitstr",
},
Arguments = new List<SqlExpression>()
{
new SqlStringExpression()
{
Value = "a;b"
},
new SqlStringExpression()
{
Value = ";"
},
},
},
},
},
}
},
};
var sql = "select fa.FlowId from FlowActivity fa order by fa.FlowId desc,fa.Id asc";
var sqlAst = DbUtils.Parse(sql, DbType.SqlServer);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "FlowId"
},
Table = new SqlIdentifierExpression()
{
Value = "fa"
},
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "FlowActivity"
},
Alias = new SqlIdentifierExpression()
{
Value = "fa"
},
},
OrderBy = new SqlOrderByExpression()
{
Items = new List<SqlOrderByItemExpression>()
{
new SqlOrderByItemExpression()
{
Body =
new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "FlowId"
},
Table = new SqlIdentifierExpression()
{
Value = "fa"
},
},
OrderByType = SqlOrderByType.Desc
},
new SqlOrderByItemExpression()
{
Body =
new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "Id"
},
Table = new SqlIdentifierExpression()
{
Value = "fa"
},
},
OrderByType = SqlOrderByType.Asc
},
},
},
},
};
var sql = "select fa.FlowId from FlowActivity fa group by fa.FlowId,fa.Id HAVING count(fa.Id)>1";
var sqlAst = DbUtils.Parse(sql, DbType.SqlServer);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "FlowId"
},
Table = new SqlIdentifierExpression()
{
Value = "fa"
},
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "FlowActivity"
},
Alias = new SqlIdentifierExpression()
{
Value = "fa"
},
},
GroupBy = new SqlGroupByExpression()
{
Items = new List<SqlExpression>()
{
new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "FlowId"
},
Table = new SqlIdentifierExpression()
{
Value = "fa"
},
},
new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "Id"
},
Table = new SqlIdentifierExpression()
{
Value = "fa"
},
},
},
Having = new SqlBinaryExpression()
{
Left = new SqlFunctionCallExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "count"
},
Arguments = new List<SqlExpression>()
{
new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "Id"
},
Table = new SqlIdentifierExpression()
{
Value = "fa"
},
},
},
},
Operator = SqlBinaryOperator.GreaterThen,
Right = new SqlNumberExpression()
{
Value = 1M
},
},
},
},
};
var sql = "select * from test t limit 1,5";
var sqlAst = DbUtils.Parse(sql, DbType.MySql);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
Alias = new SqlIdentifierExpression()
{
Value = "t",
},
},
Limit = new SqlLimitExpression()
{
Offset = new SqlNumberExpression()
{
Value = 1M,
},
RowCount = new SqlNumberExpression()
{
Value = 5M,
},
},
},
};
Limit分页子句，值为SqlLimitExpression表达式，他的内容如下
每页数量，即RowCount字段，这本例子中，值为5
跳过数量，即Offset字段,本例子中，值为1
1.5.2 oracle
var sql = "SELECT * FROM TEST3 t ORDER BY t.NAME DESC FETCH FIRST 2 rows ONLY";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
}
},
From = new SqlTableExpression()
{
Alias = new SqlIdentifierExpression()
{
Value = "t"
},
Name = new SqlIdentifierExpression()
{
Value = "TEST3"
}
},
OrderBy = new SqlOrderByExpression()
{
Items = new List<SqlOrderByItemExpression>()
{
new SqlOrderByItemExpression()
{
OrderByType = SqlOrderByType.Desc,
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression() { Value = "NAME" },
Table = new SqlIdentifierExpression()
{
Value = "t"
}
}
}
}
},
Limit = new SqlLimitExpression()
{
RowCount = new SqlNumberExpression()
{
Value = 2
}
}
}
};
1.5.3 pgsql
var sql = "select * from test5 t order by t.name limit 1 offset 10;";
var sqlAst = DbUtils.Parse(sql, DbType.Pgsql);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test5",
},
Alias = new SqlIdentifierExpression()
{
Value = "t",
},
},
OrderBy = new SqlOrderByExpression()
{
Items = new List<SqlOrderByItemExpression>()
{
new SqlOrderByItemExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "name",
},
Table = new SqlIdentifierExpression()
{
Value = "t",
},
},
},
},
},
Limit = new SqlLimitExpression()
{
Offset = new SqlNumberExpression()
{
Value = 10M,
},
RowCount = new SqlNumberExpression()
{
Value = 1M,
},
},
},
};
1.5.4 sqlServer
var sql = "select * from test t order by t.name OFFSET 5 ROWS FETCH NEXT 10 ROWS ONLY";
var sqlAst = DbUtils.Parse(sql, DbType.SqlServer);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
}
},
From = new SqlTableExpression()
{
Alias = new SqlIdentifierExpression()
{
Value = "t"
},
Name = new SqlIdentifierExpression()
{
Value = "test"
}
},
OrderBy = new SqlOrderByExpression()
{
Items = new List<SqlOrderByItemExpression>()
{
new SqlOrderByItemExpression()
{
Body = new SqlPropertyExpression()
{
Name = new SqlIdentifierExpression() { Value = "name" },
Table = new SqlIdentifierExpression()
{
Value = "t"
}
}
}
}
},
Limit = new SqlLimitExpression()
{
Offset = new SqlNumberExpression()
{
Value = 5
},
RowCount = new SqlNumberExpression()
{
Value = 10
}
}
}
};
1.6 ConnectBy层次查询语句（oracle专用）
var sql = "SELECT EMPLOYEEID , MANAGERID , LEVEL FROM EMPLOYEE e START WITH MANAGERID IS NULL CONNECT BY NOCYCLE PRIOR EMPLOYEEID = MANAGERID ORDER SIBLINGS BY EMPLOYEEID ";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlIdentifierExpression()
{
Value = "EMPLOYEEID",
},
},
new SqlSelectItemExpression()
{
Body = new SqlIdentifierExpression()
{
Value = "MANAGERID",
},
},
new SqlSelectItemExpression()
{
Body = new SqlIdentifierExpression()
{
Value = "LEVEL",
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "EMPLOYEE",
},
Alias = new SqlIdentifierExpression()
{
Value = "e",
},
},
ConnectBy = new SqlConnectByExpression()
{
StartWith = new SqlBinaryExpression()
{
Left = new SqlIdentifierExpression()
{
Value = "MANAGERID",
},
Operator = SqlBinaryOperator.Is,
Right = new SqlNullExpression()
},
Body = new SqlBinaryExpression()
{
Left = new SqlIdentifierExpression()
{
Value = "EMPLOYEEID",
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlIdentifierExpression()
{
Value = "MANAGERID",
},
},
IsNocycle = true,
IsPrior = true,
OrderBy = new SqlOrderByExpression()
{
Items = new List<SqlOrderByItemExpression>()
{
new SqlOrderByItemExpression()
{
Body = new SqlIdentifierExpression()
{
Value = "EMPLOYEEID",
},
},
},
IsSiblings = true,
},
},
},
};
var sql = "SELECT name into test14 from TEST as t ";
var sqlAst = DbUtils.Parse(sql, DbType.SqlServer);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlIdentifierExpression()
{
Value = "name"
},
},
},
Into = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test14"
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST"
},
Alias = new SqlIdentifierExpression()
{
Value = "t"
},
},
},
};
into子句，在本例子中值为SqlTableExpression，即into到某张表里。
2. Insert插入语句
2.1 插入单个值
var sql = "insert into test11(name,id) values('a1','a2')";
var sqlAst = DbUtils.Parse(sql, DbType.SqlServer);
解析结果如下：
var expect = new SqlInsertExpression()
{
Columns = new List<SqlExpression>()
{
new SqlIdentifierExpression()
{
Value = "name"
},
new SqlIdentifierExpression()
{
Value = "id"
},
},
ValuesList = new List<List<SqlExpression>>()
{
new List<SqlExpression>()
{
new SqlStringExpression()
{
Value = "a1"
},
new SqlStringExpression()
{
Value = "a2"
},
},
},
Table = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test11"
},
},
};
var sql = "insert into test11(name,id) values('a1','a2'),('a3','a4')";
var sqlAst = DbUtils.Parse(sql, DbType.MySql);
解析结果如下：
var expect = new SqlInsertExpression()
{
Columns = new List<SqlExpression>()
{
new SqlIdentifierExpression()
{
Value = "name"
},
new SqlIdentifierExpression()
{
Value = "id"
},
},
ValuesList = new List<List<SqlExpression>>()
{
new List<SqlExpression>()
{
new SqlStringExpression()
{
Value = "a1"
},
new SqlStringExpression()
{
Value = "a2"
},
},
new List<SqlExpression>()
{
new SqlStringExpression()
{
Value = "a3"
},
new SqlStringExpression()
{
Value = "a4"
},
},
},
Table = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test11"
},
},
};
var sql = "INSERT INTO TEST2(name) SELECT name AS name2 FROM TEST t";
var sqlAst = DbUtils.Parse(sql, DbType.MySql);
解析结果如下：
var expect = new SqlInsertExpression()
{
Columns = new List<SqlExpression>()
{
new SqlIdentifierExpression()
{
Value = "name"
},
},
Table = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST2"
},
},
FromSelect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlIdentifierExpression()
{
Value = "name"
},
Alias = new SqlIdentifierExpression()
{
Value = "name2"
},
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "TEST"
},
Alias = new SqlIdentifierExpression()
{
Value = "t"
},
},
},
},
};
var sql = "update test set name ='4',d='2024-11-22 08:19:47.243' where name ='1'";
var sqlAst = DbUtils.Parse(sql, DbType.MySql);
解析结果如下：
var expect = new SqlUpdateExpression()
{
Table = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test"
},
},
Where = new SqlBinaryExpression()
{
Left = new SqlIdentifierExpression()
{
Value = "name"
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlStringExpression()
{
Value = "1"
},
},
Items = new List<SqlExpression>()
{
new SqlBinaryExpression()
{
Left = new SqlIdentifierExpression()
{
Value = "name"
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlStringExpression()
{
Value = "4"
},
},
new SqlBinaryExpression()
{
Left = new SqlIdentifierExpression()
{
Value = "d"
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlStringExpression()
{
Value = "2024-11-22 08:19:47.243"
},
},
},
};
var sql = "delete from test where name=4";
var sqlAst = DbUtils.Parse(sql, DbType.MySql);
解析结果如下：
var expect = new SqlDeleteExpression()
{
Table = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test"
},
},
Where = new SqlBinaryExpression()
{
Left = new SqlIdentifierExpression()
{
Value = "name"
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlNumberExpression()
{
Value = 4M
},
},
};
var sql = @"select *--abc from test lbu WHERE a ='1'--aaaaaa
FROM test";
var sqlAst = DbUtils.Parse(sql, DbType.SqlServer);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
},
},
};
如上例子，单行注释被正确忽视，解析正确。
5.2 多行注释
var sql = @"/*这
是
顶部*/
select *--abc
FROM test/*这
是
底部*/";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
解析结果如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
},
},
};
如上例子，多行注释被正确忽视，解析正确。
6. 如何解析ast抽象语法树
当我们通过
var sql = @"select * from test";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
var sql = @"select * from test";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
var unitTestAstVisitor = new UnitTestAstVisitor();
sqlAst.Accept(unitTestAstVisitor);
var result = unitTestAstVisitor.GetResult();
其中的result就是解析抽象语法树生成的字符串，如下：
var expect = new SqlSelectExpression()
{
Query = new SqlSelectQueryExpression()
{
Columns = new List<SqlSelectItemExpression>()
{
new SqlSelectItemExpression()
{
Body = new SqlAllColumnExpression()
},
},
From = new SqlTableExpression()
{
Name = new SqlIdentifierExpression()
{
Value = "test",
},
},
},
};
var sql = @"select * from test";
var sqlAst = DbUtils.Parse(sql, DbType.Oracle);
if (sqlAst is SqlSelectExpression sqlSelectExpression && sqlSelectExpression.Query is SqlSelectQueryExpression sqlSelectQueryExpression)
{
sqlSelectQueryExpression.Where = new SqlBinaryExpression()
{
Left = new SqlPropertyExpression()
{
Table = new SqlIdentifierExpression()
{
Value = "test"
},
Name = new SqlIdentifierExpression()
{
Value = "name"
}
},
Operator = SqlBinaryOperator.EqualTo,
Right = new SqlStringExpression()
{
Value = "a"
}
};
}
var sqlGenerationAstVisitor = new SqlGenerationAstVisitor(DbType.Oracle);
sqlAst.Accept(sqlGenerationAstVisitor);
var newSql = sqlGenerationAstVisitor.GetResult();
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