Java – differences between JDBC

What is the main difference between spring JDBC and JDBC?

Solution

Let me look at a simple example of using JDBC:

final Connection connection = ds.getConnection();
try {
    final Statement statement = connection.createStatement();
    try {
        final ResultSet resultSet = statement.executeQuery("SELECT COUNT(*) FROM Orders");
        try {
            resultSet.next();
            final int c = resultSet.getInt(1);
        } finally {
            resultSet.close();
        }
    } finally {
        statement.close();
    }
} finally {
    connection.close();
}

It's much better to try to use resources:

try (
        Connection connection = ds.getConnection();
        Statement statement = connection.createStatement();
        ResultSet resultSet = statement.executeQuery("SELECT COUNT(*) FROM Orders");
) {
    resultSet.next();
    final int c = resultSet.getInt(1);
}

Of course, you can extract common code and design patterns using the template method Effectively, you will recreate the jdbctemplate:

final int c = new JdbcTemplate(ds).queryForInt("SELECT COUNT(*) FROM Orders");

Spring JDBC also provides exception conversion (no longer checking the difference between sqlexception and database / dialect) and simple ORM functions