Apache——DBUtils

public class BasicDao {

    private static QueryRunner queryRunner;

    static {
        queryRunner = new QueryRunner();
    }

    //返回结果集(ArrayList集合)
    public List queryResultSet(String sql, Class clazz, Object... parameters) {
        Connection connection = JDBCUtilsByDruid.getConnection();
        try {
            return queryRunner.query(connection, sql, new BeanListHandler(clazz), parameters);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            JDBCUtilsByDruid.close(null, null, connection);
        }
    }

    //返回单行结果(单个对象)
    public T querySingle(String sql, Class clazz, Object... parameters) {
        Connection connection = JDBCUtilsByDruid.getConnection();
        try {
            return queryRunner.query(connection, sql, new BeanHandler(clazz), parameters);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            JDBCUtilsByDruid.close(null, null, connection);
        }
    }

    //返回单行单列
    public Object queryScalar(String sql, Object... parameters) {
        Connection connection = JDBCUtilsByDruid.getConnection();
        try {
            return queryRunner.query(connection, sql, new ScalarHandler<>(), parameters);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            JDBCUtilsByDruid.close(null, null, connection);
        }
    }

    //执行DML语句
    public int update(String sql, Object... paramenters) {
        Connection connection = JDBCUtilsByDruid.getConnection();
        try {
            int affectedRow = queryRunner.update(connection, sql, paramenters);
            return affectedRow;
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            JDBCUtilsByDruid.close(null, null, connection);
        }
    }
}