Can I Execute Multiple Queries in a Single Statement Using JDBC Connector/J in MySQL?

Executing Multiple Queries in MySQL with JDBC Connector/J

In MySQL Connector/J, executing multiple queries separated by a semicolon is typically not supported. Instead, queries must be executed separately.

Reason for the Error

When using the execute method to execute a SQL statement that contains multiple semicolon-separated queries, you will encounter a MySQLSyntaxErrorException. This is because, in most databases, including MySQL, the semicolon is used as a statement terminator, rather than as part of the statement syntax.

MySQL-Specific Option

MySQL provides an option called allowMultiQueries that can be enabled to allow the execution of multiple queries in a single statement. However, this is not compliant with the JDBC specification and may make your code less portable.

Best Practice

For optimal portability and compatibility with the JDBC specification, it is recommended to execute multiple queries separately. Here's an example:

Statement statement = connection.createStatement();
statement.execute("select fullName from user where user_id=1");
ResultSet resultSet1 = statement.getResultSet();

statement.execute("select fullName from user where user_id=2");
ResultSet resultSet2 = statement.getResultSet();

By executing queries separately, you avoid potential syntax errors and ensure that your code is compliant with JDBC standards.

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