sql 基于数据库表或视图创建类

Posted 2021-05-13

DECLARE @TableName varchar(2048) = 'PPB_DirectoryManager_TS_MailboxCacheExchange'

select * from information_schema.columns WHERE TABLE_NAME = @TableName

-- C# Classes
select

              'public ' +
              (CASE    WHEN DATA_TYPE = 'bit' THEN 'bool'
                                           WHEN DATA_TYPE = 'nvarchar' THEN 'string'
                                           WHEN DATA_TYPE = 'varchar' THEN 'string'
                                           WHEN DATA_TYPE = 'date' THEN 'DateTime'
                                           WHEN DATA_TYPE = 'datetime' THEN 'DateTime'
                                           WHEN DATA_TYPE = 'datetime2' THEN 'DateTime'
                                           WHEN DATA_TYPE = 'uniqueidentifier' THEN 'Guid'
                                           WHEN DATA_TYPE = 'int' THEN 'int'
                                           WHEN DATA_TYPE = 'bigint' THEN 'long'
                                           WHEN DATA_TYPE = 'smallint' THEN 'short'
                                           WHEN DATA_TYPE = 'tinyint' THEN 'short'
                                           WHEN DATA_TYPE = 'decimal' THEN 'decimal'
                                           WHEN DATA_TYPE = 'numeric' THEN 'decimal'
                                           WHEN DATA_TYPE = 'varbinary' THEN 'byte[]'

                                           ELSE 'object' END) +

              (CASE WHEN IS_NULLABLE = 'YES' AND DATA_TYPE NOT IN ('nvarchar', 'varchar') THEN '?' ELSE '' END) +
              ' ' + COLUMN_NAME + ' { get; set; }'


from information_schema.columns WHERE TABLE_NAME = @TableName




-- SQL Add
select

              '@' + COLUMN_NAME + ' ' + DATA_TYPE +

              CASE     WHEN DATA_TYPE IN ('nvarchar', 'varchar', 'varbinary') THEN
                                                          CASE     WHEN ISNULL(CHARACTER_MAXIMUM_LENGTH, -999) = -1 THEN '(MAX)' 
                                                                                      WHEN ISNULL(CHARACTER_MAXIMUM_LENGTH, -999) >= 0 THEN '(' + CONVERT(varchar(max), CHARACTER_MAXIMUM_LENGTH) + ')' 
                                                                                      ELSE '' END

                                           WHEN DATA_TYPE IN ('datetime2', 'datetimeoffset') THEN
                                                          (CASE    WHEN DATETIME_PRECISION IS NOT NULL THEN '(' + CONVERT(varchar(max), DATETIME_PRECISION) + ')' ELSE '' END)

                                           WHEN DATA_TYPE IN ('decimal', 'numeric') THEN
                                                          (CASE    WHEN NUMERIC_PRECISION IS NOT NULL THEN '(' + CONVERT(varchar(max), NUMERIC_PRECISION) + ', ' + CONVERT(varchar(max), NUMERIC_SCALE) +')' ELSE '' END)

                             ELSE '' END +

              ' = NULL,'

from information_schema.columns WHERE TABLE_NAME = @TableName




-- SQL Update
select

              '[' + COLUMN_NAME + '] = @' + COLUMN_NAME + ','

from information_schema.columns WHERE TABLE_NAME = @TableName