问题
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?
回答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 '}';
回答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!
回答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.
回答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
回答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
回答6:
You could also use LINQ to SQL with MySQL. But then, you should research a bit to find the correct provider you'd have to install.
I think it pretty much has it covered here:
LINQ to MySQL
回答7:
NHibernate can connect to MySQL and is Free:
http://community.jboss.org/wiki/DatabasesSupportedByNHibernate
回答8:
Subsonic (open source) works with MySQL (5.0+) with special support for InnoDB -
http://subsonicproject.com/
回答9:
I use NHibernate with MyGeneration
MyGeneration is a program that can read your database schema and generate code based on a template (in the case of NHibernate, the Entities and Mappings)
回答10:
The first example is very good but some types are missing so I'm sharing adding missing types (set, float etc ..)
select 'table_name' INTO @table; #table name
select 'db_name' 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 'shorte_prodottoe_prodotto' ,'int?' union all
select 'bigint' ,'int?' union all
select 'float' ,'float' union all
select 'smallint' ,'sbyte' union all
select 'int' ,'int?' union all
select 'double' ,'double?' union all
select 'decimal' ,'double?' union all
select 'date' ,'DateTime?' union all
select 'boolean' ,'bool' union all
select 'set' ,'string' union all
select 'tinyint' ,'bool?'
) tps on c.data_type like tps.orign
where table_schema=@schema and table_name=@table union
select '}';
来源：https://stackoverflow.com/questions/7771455/create-c-sharp-classes-based-of-mysql-table