通过SQL语句生成实体类
DECLARE @TableName sysname = '表名';
DECLARE @Result VARCHAR(MAX) = 'public class ' + @TableName + '
{';
SELECT @Result = @Result + '
/// <summary>
/// ' + CAST(t.Summary AS VARCHAR(MAX)) + '
/// </summary>
public ' + ColumnType + NullableSign + ' ' + ColumnName + ' { get; set; }
'
FROM
(
SELECT REPLACE(col.name, ' ', '_') ColumnName,
col.column_id ColumnId,
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,
ISNULL(ep.value, col.name) AS Summary
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 ep
ON ep.major_id = col.object_id
AND ep.minor_id = col.column_id
WHERE col.object_id = OBJECT_ID(@TableName)
) t
ORDER BY ColumnId;
SET @Result = @Result + '
}';
PRINT @Result;