在一个 go 中执行多个本机查询

Question

I'm wondering if it is possible to execute several semicolon-separated SQL update queries with one SQLQuery#executeUpdate() call in Hibernate (3.2).

I have string containing multiple updates like this:

String statements = "UPDATE Foo SET bar=1*30.00 WHERE baz=1; 
                     UPDATE Foo SET bar=2*45.50 WHERE baz=2;...";

I'm trying to do

 Query query = session.createSQLQuery(statements);
 query.executeUpdate();

But keep getting the following error

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 
You have an error in your SQL syntax; check the manual that corresponds to 
your MySQL server version for the right syntax to use near 
'UPDATE Foo SET bar=Y WHERE ' at line 3

If I execute the contents of the statements by hand I get no errors so I'm assuming the multiple semicolon-separated queries are causing trouble somewhere in Hibernate or JDBC.

Is it better to just split the statements string and do createSQLQuery(statement).executeUpdate() individually for each line?

Answer 1

An alternative is to use a CASE statement. For example:

UPDATE Foo
    SET bar = 
    CASE baz
       WHEN 1 THEN 'X'
       WHEN 2 THEN 'Y'
    END CASE
WHERE baz in (1,2)

Answer 2

well you have to at least embrace X and Y with single quotes, I'd say.

Answer 3

What you can do is use batch statements, basically before you execute your query call the addBatch(string query); method, then when all your queries are in the batch just call the executeBatch() method. That will perform them all for you in the order you added the mto the batch.

also: the error in your syntax is you need put in quotes 'Y' or 'X'