Do I need a new query object for each MySQL statement?

Question

I'm trying to compile several MySQL statements and execute them in the same request, but I keep getting a MySQL syntax error:

local.sql = "";
for (local.i in this.hitArray)
{
    local.sql &= "UPDATE posts SET viewCount = posts.viewCount + 1 WHERE posts.id = #local.i.postId#;";
}
local.service.setSQL(local.sql);

Raw SQL dump (local.sql var):

UPDATE posts SET viewCount = posts.viewCount + 1 WHERE posts.id = 95;UPDATE posts SET viewCount = posts.viewCount + 1 WHERE posts.id = 95;UPDATE posts SET viewCount = posts.viewCount + 1 WHERE posts.id = 95;

It appears the query is chocking right at the end of the first statement.

Answer 1

MySQL disables multiple statements by default to prevent sql injection. You must add the allowMultiQueries flag to your connection string to enable them.

Note: Obviously if you enable multiple statements, it is very important all of your queries use cfqueryparam or addParam because you are now at risk for sql injection.