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Asked: 2026-06-10T20:49:08+00:00

Iam using a Java Swing Application to Update a column in Mysql table. Here

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Iam using a Java Swing Application to Update a column in Mysql table. Here is My code(part)

String qunty = txtWithdraw.getText();
String partno = txtNo.getText();
int qty = Integer.parseInt(qunty);
con = DriverManager.getConnection(url + db, "username", "password");
        Statement st = con.createStatement();
String sell = "update Store_info_table set qnty_received = qnty_received - " + qty +      "where Part_number = '" + partno + "'";
                st.executeUpdate(sell);

I am getting the Exception that:

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 'Part_number = 'DF6534'' at line 1

I want to Update the qnty_received field so that it is equal to the Original value minus the value passed by the user i.e (int qty). What Error Am I making?

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1 Answer

  1. Editorial Team

    Add a space before the where:

     " where Part_number = '" + partno + "'";

    As a good practice, I recommend you to use PreparedStatement and set your parameters with the same. Concatenating the parameters dynamically may force the db engine to parse a new SQL statement every time.

    A SQL statement is precompiled and stored in a PreparedStatement
    object. This object can then be used to efficiently execute this
    statement multiple times.

    See: PreparedStatement

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