Why Does `executeQuery()` Fail with Data Manipulation Statements in MySQL?

Error: "Cannot issue data manipulation statements with executeQuery()."

When executing queries in MySQL, it's important to use the appropriate method based on the type of operation being performed. The error "can not issue data manipulation statements with executeQuery()" occurs when a data manipulation statement is attempted using the executeQuery() method.

Understanding Data Manipulation Statements

Data manipulation statements are SQL commands used to modify data in a database. These typically include INSERT, UPDATE, and DELETE statements, as well as statements that can change data structures (e.g., CREATE TABLE, ALTER TABLE).

Using executeUpdate() for Data Manipulation

To perform data manipulation in Java using JDBC, the executeUpdate() method should be used. This method is specifically designed to execute data manipulation statements. It returns an integer representing the number of rows affected by the statement.

Example

Consider the following Java code:

Statement statement = connection.createStatement();
int rowCount = statement.executeUpdate("INSERT INTO tableA VALUES (1, 'John Doe')");

In this example, the executeUpdate() method is used to execute an INSERT statement, which adds a new row to tableA. The rowCount variable will contain the number of rows affected by the statement (1 in this case).

Conclusion

To successfully execute data manipulation statements in Java with JDBC, it is essential to use the executeUpdate() method instead of executeQuery(). By following this guideline, you can avoid the "can not issue data manipulation statements with executeQuery()" error and ensure proper data manipulation in your applications.

The above is the detailed content of Why Does `executeQuery()` Fail with Data Manipulation Statements in MySQL?. For more information, please follow other related articles on the PHP Chinese website!