How to dynamically create database tables in MyBatis?

2 years ago
Benjamin Taylor
2 minutes

MyBatis is an open-source persistence framework for persisting Java objects, but it does not handle the creation of database tables. Database tables are usually created within the database management system.

Before using MyBatis, if you want to create database tables, you can use tools provided by database management systems (such as MySQL’s SQL statements, Navicat, etc.) to create tables. You can use SQL statements similar to the following:

CREATE TABLE IF NOT EXISTS `user` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(50) DEFAULT NULL,
  `age` INT(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

The above is creating a table named user, which includes fields for id, name, and age.

It is generally not recommended to create database tables in Java code using MyBatis, as changes to table structures should typically be handled by a database administrator or through database scripts. However, if it is necessary to dynamically create database tables in Java code, you can use MyBatis’s SqlSession to execute SQL statements.

SqlSession sqlSession = sqlSessionFactory.openSession();
try {
    Connection connection = sqlSession.getConnection();
    Statement statement = connection.createStatement();
    statement.executeUpdate("CREATE TABLE IF NOT EXISTS `user` (  `id` INT(11) NOT NULL AUTO_INCREMENT,  `name` VARCHAR(50) DEFAULT NULL,  `age` INT(11) DEFAULT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;");
    connection.commit();
} finally {
    sqlSession.close();
}

The code above uses SqlSession to establish a connection to the database and uses Statement to execute SQL statements for creating a table. It is important to be cautious when using this method, as dynamically creating tables may pose potential risks and issues.

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