Run multiple MySQL queries from PHP | Why is this not working?

Question

I am trying to run multiple queries on some mysql dbs from a php file. However it is not working. Can anyone point out where I am going wrong?

Here is the contents of th

Answer 1

The most important thing to do in such a case is debugging:

• Remove the @ prefix to see errors
• Add a echo mysql_error() if mysql_query() returns false to see mySQL's error messages

in your specific case, mysql_query() is not able to execute more than one statement. The easiest solution is to use two separate commands.

Answer 2

You are making only one query. Read docs for mysql_query

mysql_query() sends a unique query (multiple queries are not supported) to the currently active database on the server that's associated with the specified link_identifier.

You should split each query in it's own string and send it one by one to MySQL.

$query1 = "TRUNCATE TABLE db2.table1;";
$query2 = "INSERT INTO db2.table1
SELECT 
       column1, column2, column3, column4
       FROM db1.table1;";

$query3 = "TRUNCATE TABLE db2.table2;";
$query4 = "INSERT INTO db2.table2
SELECT 
       column1, column2, column3, column4 
       FROM db1.table2;";
$query5= "ANALYZE TABLE db2.table2;";

$result1 = @mysql_query($query1);  
$result2 = @mysql_query($query2);  
$result3 = @mysql_query($query3);  
$result4 = @mysql_query($query4);  
$result5 = @mysql_query($query5); 

Or use some other interface function that supports multiple queries. Personally I don't know if there is such a thing.