Why Does executeQuery() Throw \'Cannot Issue Data Manipulation Statements\' in JDBC?

Query Execution Error: "Cannot Issue Data Manipulation Statements with executeQuery()

When attempting to execute MySQL queries using executeQuery() for statements that modify data, such as INSERT, UPDATE, or DELETE, an error is encountered: "Cannot issue data manipulation statements with executeQuery()." This error message indicates that the executeQuery() method is not suitable for data manipulation operations.

Understanding the Role of executeQuery() and executeUpdate()

In JDBC, two primary methods for executing SQL statements are executeQuery() and executeUpdate(). Each method serves a specific purpose:

• executeQuery() retrieves data from a database and returns a result set. It is typically used for SELECT statements.
• executeUpdate() modifies data in the database by performing INSERT, UPDATE, or DELETE operations. It returns an integer indicating the number of affected rows.

Resolving the Error

To resolve the error, replace the executeQuery() call with the appropriate data manipulation method, executeUpdate(), for statements that modify data.

For example, the following code snippet corrects the error by using executeUpdate() for the data manipulation queries:

executeUpdate(query1);
executeUpdate(query2);

Additional Information

The executeUpdate() method can handle not only data manipulation statements but also JDBC DDL (Data Definition Language) statements that do not return result sets, such as CREATE TABLE or ALTER TABLE.

Remember to use the correct method based on the type of SQL statement you want to execute to avoid errors and ensure proper data handling.

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