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08.04.2008 at 02:34PM PDT, ID: 23620562

	[x] Attachment Details

IF EXISTS .. THEN -- MSSQL to Mysql

[x]

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8.9

Zone:

MySQL Server

Tags:

Mysql, Mysql, 5.0.51b

I am porting SQL scripts from MSSQL to Mysql.
Can someone give me a simple example of the Mysql eqivilent to:

IF EXISTS (SELECT...) /* see if table exists */
BEGIN
(update... set... from... where statement)
END

I am currently setting an SQL string in a stored procedure to select from Information_schema.tables
and the select statement works fine when tested outside of the stored procedure, but I get the error:

"ERROR 1064 (42000): You have an error [...] near 'IF EXISTS (SELECT table_name, table_schema FROM Information_schema.tables"

when I do the PREPARE inside the procedure.

Here is a snippit of the code

SET @SQL_String:=CONCAT(
'IF EXISTS (SELECT table_name, table_schema FROM Information_schema.tables
WHERE table_name = [...] THEN
(update... set... from... where statement)
'); /*end concat */
END IF;);

Again the SELECT statement works just fine, but when I put it inside the IF EXISTS () THEN
it gives the above error. I suppose the real questions is "Does IF EXISTS (SELECT ...) THEN
work in Mysql and what is its syntax/structure?". I cannot find the syntax in the Mysql.com web pages,
but it seems all the stuff one can do is not always there.

(Sorry -- I dragged this out longer than I intended ;^)

Kat

#	Title
1	concat
2	Export schema
3	MySQL to MSSQL
4	MySQL Database Administration
5	MySQL CONCAT
6	MSSQL Backup