`executeQuery()` vs. `executeUpdate()`: When Should I Use Which JDBC Method for Data Manipulation in Java?

executeQuery() vs. executeUpdate(): Understanding Data Manipulation in Java

When working with data in a relational database like MySQL, it's essential to understand the distinction between two key JDBC methods: executeQuery() and executeUpdate().

In the provided code, the error "can not issue data manipulation statements with executeQuery()" occurs because the query1 and query2 attempts manipulate data. To perform such operations, you must use the executeUpdate() method instead.

executeUpdate() is designed for statements that alter data in a database, such as INSERT, UPDATE, or DELETE statements. On the other hand, executeQuery() is used for statements that retrieve data and return a result set, such as SELECT statements.

According to the executeUpdate() javadoc:

Executes the given SQL statement, which may be an INSERT, UPDATE, or DELETE statement or an SQL statement that returns nothing, such as an SQL DDL statement.

In the specific context of the code provided, if you intend to modify data in tableA or tableB, you should replace executeQuery() with executeUpdate(). By making this adjustment, you'll be able to successfully execute both queries and perform the desired data manipulation.

The above is the detailed content of `executeQuery()` vs. `executeUpdate()`: When Should I Use Which JDBC Method for Data Manipulation in Java?. For more information, please follow other related articles on the PHP Chinese website!