SQLServer 根据表名生成实体类

青旅半醒 2021-07-05 02:48 550阅读 0赞

declare @TableName sysname = 'T1'
    declare @Result varchar(max) = ' /// <summary> /// ' + @TableName +
    
    ' /// </summary> public class ' + @TableName + ' {'
    
    select @Result = @Result + ' /// <summary> /// ' + CONVERT(NVARCHAR(500), ISNULL(ColName, '无')) +
    
    ' /// </summary> public ' + ColumnType + NullableSign + ' ' + ColumnName + ' { get; set; } '
    from
    (
        SELECT
            replace(col.name, ' ', '_') ColumnName,
            column_id ColumnId,
            prop.value 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 'char'
                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
            join sys.types typ on
                col.system_type_id = typ.system_type_id AND col.user_type_id = typ.user_type_id
                LEFT JOIN sys.extended_properties prop ON col.object_id = prop.major_id AND col.column_id = prop.minor_id
        where object_id = object_id(@TableName)
    ) t
    --order by ColumnId
    
    set @Result = @Result + ' }'
    
    print @Result