存储过程中没有带有JDBC临时表的ResultSet

Question

I have a stored procedure which creates a temp table and populates the temp table. After populating it, it returns the rows inside the table with ( SELECT ).

When running it from MySQL workbench works tremendously but in JAVA with JDBC, the ResultSet is empty. I have gone through some posts which say that we should not use PreparedStatment but even Statement doesn't work.

For test, I divided the job in stored procedure. Now I call:

CallableStatement ps = connection.prepareCall("{CALL myProcedure(?)}");
ps.setString(1, "value");
ps.execute();

which creates the temp table and populates it. Thereafter with same connection I try to do

Statement st = connection.createStatement();
ResultSet rs = st.executeQuery("SELECT * FROM tmp_table");

Still ResultSet is empty. What can I do? Any help is appreciated.

Answer 1

Thank you folks for help! I found the error. The error was in code.

I send a parameter when calling procedure. For testing purposes I did

SET @param = "value";

Later on, I removed it but I forgot to remove it when inserting data into temporary table which used that @param . MySQL somehow could see that @param and IN param is same because of name but JDBC could not see that and Therefore, it was not returning any data.