Convert T-SQL to MySQL

Question

Is there an easy way to convert Transact-SQL to MySQL?

---

I am attempting to convert a database archive of stock ticker symbols and company names.

Answer 1

I've just achieved a tsql script.

My solution is :

1. export table informations (schema pk)
2. export table data
3. export FK

I'm not very proud of my code, but it worked for me.

4 files wich are in the same folder:

Batch wich call sqlcmd

@echo off

set host= (local)
set schema=database
set user=user
set pass=pass

cd %cd%
rem tables 
SQLCMD -S %host% -d %schema% -U %user% -P %pass% -s "" -h-1 -W -i "%CD%\mysql_export_table.sql" -o "%CD%\%schema%_tables.sql" 
rem data
SQLCMD -S %host% -d %schema% -U %user% -P %pass% -s "" -h-1 -W -i "%CD%\mysql_export_data.sql" -o "%CD%\%schema%_data.sql" 
rem fk
SQLCMD -S %host% -d %schema% -U %user% -P %pass% -s "" -h-1 -W -i "%CD%\mysql_export_fk.sql" -o "%CD%\%schema%_fk.sql" 

then tsql script to export table schema mysql_export_table.sql

SET NOCOUNT ON;
SET QUOTED_IDENTIFIER ON;
DECLARE @table_name as varchar(max)



DECLARE view_cursor CURSOR FOR 
SELECT Table_name FROM information_schema.tables where TABLE_TYPE = 'BASE TABLE' and table_name not like 'sys%'

OPEN view_cursor

FETCH NEXT FROM view_cursor 
INTO @table_name

WHILE @@FETCH_STATUS = 0
BEGIN


     select ''
     select '/*** TABLE '+@table_name+' ***/ '
     select 'DROP TABLE IF EXISTS ' + QUOTENAME(@table_name, '`') + ';'
     select ''
     select 'CREATE TABLE ' + QUOTENAME(@table_name, '`') + ' ('

-- column declaration 

     select  
     CHAR(9)
+ QUOTENAME(Column_Name, '`') + ' ' +
DATA_TYPE
+
coalesce( '(' + cast(coalesce(replace(CHARACTER_MAXIMUM_LENGTH, -1, 2500), null) as varchar) + ')', '')
+ ' ' +
case IS_NULLABLE WHEN 'NO' then 'NOT ' else '' end + 'NULL'
+ ' ' +
case when COLUMNPROPERTY(object_id(TABLE_NAME), COLUMN_NAME, 'IsIdentity') = 1 then 'AUTO_INCREMENT' else '' end
--coalesce( 'DEFAULT ' + replace(replace(replace(COLUMN_DEFAULT, '(', ''), ')', ''), 'getdate', null), '')
+','
FROM information_schema.COLUMNS where TABLE_NAME = @table_name
-- PK
select  coalesce('PRIMARY KEY (' +STUFF((
SELECT distinct ', ' + QUOTENAME(Col.Column_Name,'`') from
    INFORMATION_SCHEMA.TABLE_CONSTRAINTS Tab inner join  
    INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE Col  on Col.Constraint_Name = Tab.Constraint_Name AND Col.Table_Name = Tab.Table_Name
WHERE        
    Constraint_Type = 'PRIMARY KEY '
    AND Col.Table_Name = @table_name
    FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)') , 1, 1, '')+ ')', '') 

select ') Engine InnoDB;'

    FETCH NEXT FROM view_cursor 
    INTO @table_name
END 
CLOSE view_cursor;
DEALLOCATE view_cursor;

then script for data mysql_export_data.sql

SET NOCOUNT ON;
SET QUOTED_IDENTIFIER ON;
DECLARE @table_name as varchar(max)
declare @column_names as varchar(max)


DECLARE view_cursor CURSOR FOR 
SELECT Table_name FROM information_schema.tables where TABLE_TYPE = 'BASE TABLE' and table_name not like 'sys%'

OPEN view_cursor

FETCH NEXT FROM view_cursor 
INTO @table_name

WHILE @@FETCH_STATUS = 0
BEGIN
     select ''
     select '/*** TABLE '+@table_name+' ***/ '

     select @column_names = STUFF(( SELECT ', ' + QUOTENAME(Column_Name, '`') from INFORMATION_SCHEMA.COLUMNS WHERE  Table_Name = @table_name  ORDER BY ORDINAL_POSITION FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)') , 1, 1, '')

     select 'REPLACE INTO '+ QUOTENAME(@table_name, '`') +'('+ @column_names+ ') VALUES '
     select @column_names = 'SELECT DISTINCT ''('+ STUFF(( SELECT ', '','''''' + coalesce(replace(cast(' + QUOTENAME(Column_Name)  +' as varchar(200)), '''''''',''''), '''') + ''''''''' from INFORMATION_SCHEMA.COLUMNS WHERE  Table_Name = @table_name  ORDER BY ORDINAL_POSITION FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)') , 1, 4, '') + '+''),'' FROM ' + QUOTENAME(@table_name)
     exec (@column_names)

    FETCH NEXT FROM view_cursor 
    INTO @table_name
END 
CLOSE view_cursor;
DEALLOCATE view_cursor;

Finally FK script

SET NOCOUNT ON;
SET QUOTED_IDENTIFIER ON;
-- FK
-- foreign keys
SELECT 
     'ALTER TABLE',
     ' '+ QUOTENAME(OBJECT_NAME(fkcol.[object_id]), '`'),
--ADD CONSTRAINT `recherche_ibfk_1` FOREIGN KEY (`notaire_compte_id`) REFERENCES `notaire_compte` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;
    ' ADD CONSTRAINT',
    ' ' + QUOTENAME(fk.name, '`'), 
    ' FOREIGN KEY',
    ' (' + QUOTENAME(fkcol.name, '`') +')',
    ' REFERENCES',    
    ' ' + QUOTENAME(OBJECT_NAME(pkcol.[object_id]), '`'),
    ' (' + QUOTENAME(pkcol.name, '`') + ');',
    CHAR(13)

FROM sys.foreign_keys AS fk
INNER JOIN sys.foreign_key_columns AS fkc
ON fk.[object_id] = fkc.constraint_object_id
INNER JOIN sys.columns AS fkcol
ON fkc.parent_object_id = fkcol.[object_id]
AND fkc.parent_column_id = fkcol.column_id
INNER JOIN sys.columns AS pkcol
ON fkc.referenced_object_id = pkcol.[object_id]
AND fkc.referenced_column_id = pkcol.column_id
ORDER BY fkc.constraint_column_id;

I know, i know... it's very ugly ...

The goal of this script is not to convert TSQL to Mysql but to export database from MSSQL to Mysql

On the table result you'll have to execute a regex replace (notepad++) replace ",\r\n\r\n)" by "\r\n\r\n)"

On the data result replace ",\r\n\r\n/" by ";\r\n\r\n/"

Execution order : Table -> Data -> FK