Create C# classes based of MySQL table

Question

Is there anything built into .Net or visual studio that will allow my to create classes based off of a MySql table. I guess I am talking about persistence. I just want the class to be a 1 to 1 mapping of the table. Does anything free exist?

Solution 1

maybe you need something like this:

select 'my_table' into @table; #table name
select 'my_database' into @schema; #database name
select concat('public class ',@table,'{') union
select concat('public ',tps.dest,' ',column_name,'{get;set;}') from  information_schema.columns c
join( #datatypes mapping
select 'char' as orign ,'string' as dest union all
select 'varchar' ,'string' union all
select 'longtext' ,'string' union all
select 'datetime' ,'DateTime?' union all
select 'text' ,'string' union all
select 'bit' ,'int?' union all
select 'bigint' ,'int?' union all
select 'int' ,'int?' union all
select 'double' ,'double?' union all
select 'decimal' ,'double?' union all
select 'date' ,'DateTime?' union all
select 'tinyint' ,'bool?'
) tps on c.data_type like tps.orign
where table_schema=@schema and table_name=@table union
select '}';

Solution 2

I adjusted the sql of MeelStorm because it was appearing some errors regarding the language. I put other types of data as well and I drop the class declaration because this is unnecessary to me. So the final result is:

select concat('public ',tps.dest,' ',column_name,'{get;set;}') as code 
from  information_schema.columns c
join(
select 'char' as orign ,'string' as dest union all
select 'varchar' ,'string' union all
select 'longtext' ,'string' union all
select 'datetime' ,'DateTime' union all
select 'text' ,'string' union all
select 'bit' ,'int' union all
select 'bigint' ,'int' union all
select 'int' ,'int' union all
select 'double' ,'double' union all
select 'decimal' ,'double' union all
select 'date' ,'DateTime' union all
select 'tinyint' ,'bool'
) tps on c.data_type like tps.orign
where table_schema='your_schema' and table_name='your_table' 
order by c.ordinal_position

Hope it helps. Cheers!

Solution 3

here is great work done :

http://www.code4copy.com/post/generate-c-sharp-model-class-mysql-table

Create a procedure as follows :

-- --------------------------------------------------------------------------------
-- Routine DDL
-- Note: comments before and after the routine body will not be stored by the server
-- --------------------------------------------------------------------------------
DELIMITER $$

CREATE DEFINER=`root`@`localhost` PROCEDURE `GenCSharpModel`(in pTableName VARCHAR(255) )
BEGIN
DECLARE vClassName varchar(255);
declare vClassCode mediumtext;
declare v_codeChunk varchar(1024);
DECLARE v_finished INTEGER DEFAULT 0;
DEClARE code_cursor CURSOR FOR
    SELECT code FROM temp1; 

DECLARE CONTINUE HANDLER 
        FOR NOT FOUND SET v_finished = 1;

set vClassCode ='';
/* Make class name*/
    SELECT (CASE WHEN col1 = col2 THEN col1 ELSE concat(col1,col2)  END) into vClassName
    FROM(
    SELECT CONCAT(UCASE(MID(ColumnName1,1,1)),LCASE(MID(ColumnName1,2))) as col1,
    CONCAT(UCASE(MID(ColumnName2,1,1)),LCASE(MID(ColumnName2,2))) as col2
    FROM
    (SELECT SUBSTRING_INDEX(pTableName, '_', -1) as ColumnName2,
        SUBSTRING_INDEX(pTableName, '_', 1) as ColumnName1) A) B;

    /*store all properties into temp table*/
    CREATE TEMPORARY TABLE IF NOT EXISTS  temp1 ENGINE=MyISAM  
    as (
    select concat( 'public ', ColumnType , ' ' , FieldName,' { get; set; }') code
    FROM(
    SELECT (CASE WHEN col1 = col2 THEN col1 ELSE concat(col1,col2)  END) AS FieldName, 
    case DATA_TYPE 
            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 'mediumint' then 'INT'
            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'
            when 'year' THEN 'UINT'
            else 'UNKNOWN_' + DATA_TYPE
        end ColumnType
    FROM(
    select CONCAT(UCASE(MID(ColumnName1,1,1)),LCASE(MID(ColumnName1,2))) as col1,
    CONCAT(UCASE(MID(ColumnName2,1,1)),LCASE(MID(ColumnName2,2))) as col2, DATA_TYPE
    from
    (SELECT SUBSTRING_INDEX(COLUMN_NAME, '_', -1) as ColumnName2,
    SUBSTRING_INDEX(COLUMN_NAME, '_', 1) as ColumnName1,
    DATA_TYPE, COLUMN_TYPE FROM INFORMATION_SCHEMA.COLUMNS  WHERE table_name = pTableName) A) B)C);

    set vClassCode = '';
    /* concat all properties*/
    OPEN code_cursor;

            get_code: LOOP

                FETCH code_cursor INTO v_codeChunk;

                IF v_finished = 1 THEN
                    LEAVE get_code;
                END IF;

                -- build code
                select  CONCAT(vClassCode,'\r\n', v_codeChunk) into  vClassCode ;

            END LOOP get_code;

        CLOSE code_cursor;

drop table temp1;
/*make class*/
select concat('public class ',vClassName,'\r\n{', vClassCode,'\r\n}');
END

However a little manual work will require.

Solution 4

You can use the Entity Framework for this. It connects well with MySQL. I've been following this tutorial: http://www.devart.com/dotconnect/mysql/articles/tutorial_ef.html

Solution 5

there appears to be a way to get EntityFramework working with MySQL

Using MySQL with Entity Framework

http://weblogs.asp.net/gunnarpeipman/archive/2010/12/09/getting-mysql-work-with-entity-framework-4-0.aspx

View more solutions

Comments

[Ortiga]

@KrisKrause true, in fact I do use fluent, but i think OP is more interested in MyGeneration: [...]that will allow my to create classes based off of a MySql table

[pdwetz]

Nice; needed a quick way for doing this while in a pinch. Created a gist with a few minor changes. gist.github.com/pdwetz/5368441

[Stephanie]

Utterly brilliant lightweight solution. Worked 1st time.

[ijavid]

use select concat('public ',tps.dest, IF(tps.dest = 'string', '', IF(is_nullable = 'NO', '', '?')) ... and remove ? from mappings for correct NULLable mapping

[Talon]

you could add select 'tinytext' ,'string' union all if your database has tinytext datatype

[Michael Moreno]

The link leads to a hacked website

[NEER]

Use if(c.IS_NULLABLE = 'NO', REPLACE(tps.dest, '?', '') instead of tps.dest

[Admin]

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