SQLServer之數據庫表轉化為實體類【帶注釋】

1.在開發過程中，有時候需要將數據庫表轉化為實體類。手敲除了不方便，還容易出錯。本着DRY+懶人原則,參考了一位老司機的博客【見底部】，並在其基礎上進行了優化。【原先是不帶注釋的】

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

SELECT  @Result = @Result  + CHAR(13) + '    ///<summary>' + CHAR(13)
        + '    ///' + CAST(desr AS NVARCHAR) + CHAR(13)
        + '    ///</summary>' + '
    public ' + ColumnType + NullableSign + ' ' + colname + ' '  + ' { 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;

最終效果如下:

參考鏈接：https://www.cnblogs.com/bayes/p/6206297.html