SQL表生成C#实体类

最新推荐文章于 2023-06-16 16:43:50 发布

Izrj

最新推荐文章于 2023-06-16 16:43:50 发布

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文章标签： sql c# 数据库

原文链接：https://www.cnblogs.com/jhli/p/11552105.html

版权

该博客内容展示了如何使用SQL查询动态生成C#类代码，包括字段声明、数据类型映射和可空性处理。通过DECLARE和DECLARE变量设置表名，然后遍历表的列信息，将每列转化为C#属性，最后输出完整的类定义。

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BEGIN   TRAN 
DECLARE @TableName sysname = '表名';
DECLARE @Result VARCHAR(MAX) = 'public class ' + @TableName + '
{';

SELECT  
@Result = @Result  + CHAR(13) --+ '    ///<summary>' + CHAR(13)
     --   + '    ///' + CAST(desr AS NVARCHAR) + CHAR(13)
      --  + '    ///</summary>' + '
	  +'[Column('''+colname+''')]
	  '
    +'public ' + ColumnType + NullableSign + ' ' + UPPER(LEFT(colname,1))+right(colname,LEN(colname)-1)  + ' '  + ' { get; set; }
    '
FROM    (SELECT    column_id ColumnId,
                    ISNULL(t.desctr, '') AS desr,
                    col.name colname,
                     CASE typ.name
                      WHEN 'bigint' THEN 'long'
                      WHEN 'binary' THEN 'byte[]'
                      WHEN 'bit' THEN 'bool'
                      WHEN 'char' THEN 'string'
                      WHEN 'date' THEN 'DateTime'
                      WHEN 'datetime' THEN 'DateTime'
                      WHEN 'datetime2' THEN 'DateTime'
                      WHEN 'datetimeoffset' THEN 'DateTimeOffset'
                      WHEN 'decimal' THEN 'decimal'
                      WHEN 'float' THEN 'float'
                      WHEN 'image' THEN 'byte[]'
                      WHEN 'int' THEN 'int'
                      WHEN 'money' THEN 'decimal'
                      WHEN 'nchar' THEN 'string'
                      WHEN 'ntext' THEN 'string'
                      WHEN 'numeric' THEN 'decimal'
                      WHEN 'nvarchar' THEN 'string'
                      WHEN 'real' THEN 'double'
                      WHEN 'smalldatetime' THEN 'DateTime'
                      WHEN 'smallint' THEN 'short'
                      WHEN 'smallmoney' THEN 'decimal'
                      WHEN 'text' THEN 'string'
                      WHEN 'time' THEN 'TimeSpan'
                      WHEN 'timestamp' THEN 'DateTime'
                      WHEN 'tinyint' THEN 'byte'
                      WHEN 'uniqueidentifier' THEN 'Guid'
                      WHEN 'varbinary' THEN 'byte[]'
                      WHEN 'varchar' THEN 'string'
                      ELSE 'UNKNOWN_' + typ.name
                    END ColumnType ,
                    CASE WHEN col.is_nullable = 1
                              AND typ.name IN ( 'bigint', 'bit', 'date',
                                                'datetime', 'datetime2',
                                                'datetimeoffset', 'decimal',
                                                'float', 'int', 'money',
                                                'numeric', 'real',
                                                'smalldatetime', 'smallint',
                                                'smallmoney', 'time',
                                                'tinyint', 'uniqueidentifier' )
                         THEN '?'
                         ELSE ''
                    END NullableSign
          FROM      sys.columns col
                   LEFT  JOIN ( SELECT  ISNULL(CAST(g.value AS VARCHAR), '') desctr ,
                                        g.minor_id AS minor_id
                                FROM    sys.extended_properties g
                                WHERE   g.major_id = OBJECT_ID(@TableName)
                              ) t ON t.minor_id = col.column_id
                    JOIN sys.types typ ON col.system_type_id = typ.system_type_id
                                          AND col.user_type_id = typ.user_type_id   
          WHERE     object_id = OBJECT_ID(@TableName)
        ) t
ORDER BY ColumnId;

SET @Result = @Result + '
}';

PRINT @Result;

ROLLBACK TRAN

SQL表 生成C#实体类

SQL表生成C#实体类