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? ??? ??? MySQL ???? ORM ?? SQL Server ????? C# ???? ???? ??? ??????

ORM ?? SQL Server ????? C# ???? ???? ??? ??????

Dec 21, 2024 am 02:46 AM

How to Generate C# Classes from SQL Server Tables Without an ORM?

SQL Server ??? ???? ??? ??

??:
??? ???? ??? ???? ??? ??? ? ????? SQL Server ???? ???? ???? ?? ORM?

???:
?? SQL ????? ???? ?? ???? ?? ??? ??? ??? ? ????.

declare @TableName sysname = 'TableName';
declare @Result varchar(max) = 'public class ' + @TableName + ' {';

select @Result = @Result + '
    public ' + ColumnType + NullableSign + ' ' + ColumnName + ' { get; set; }
'
from
(
    select 
        replace(col.name, ' ', '_') ColumnName,
        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 'double'
            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 'float'
            when 'smalldatetime' then 'DateTime'
            when 'smallint' then 'short'
            when 'smallmoney' then 'decimal'
            when 'text' then 'string'
            when 'time' then 'TimeSpan'
            when 'timestamp' then 'long'
            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
    where object_id = object_id(@TableName)
) t
order by ColumnId;

set @Result = @Result + '
}';

print @Result;

?:
"Name", "Phone" ?? ?? "Person"??? ???? ?? ??? ???? ??? ????. ?:

public class Person
{
    public string Name { get; set; }
    public string Phone { get; set; }
}

? ??? ORM ?? SQL Server ????? C# ???? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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