StudentDao里的插入方法
public void addStudent(Student student) throws SQLException{
		Connection conn=DBUtil.getConnection();
		String sql="insert student"+
		"(number,name,sex,age,birthday)"+
		"values("+
		"?,?,?,?,?)";
		PreparedStatement ps=conn.prepareStatement(sql);
		ps.setString(1, student.getNumber());
		ps.setString(2, student.getName());
		ps.setString(3, student.getSex());
		ps.setInt(4, student.getAge());
		ps.setDate(5, new Date(student.getBirthday().getTime()));
		ps.execute();
		conn.close();
	}

action里的
public class StudentAction {
	public static void main(String[] args) throws Exception {
		StudentDao sd=new StudentDao();
		Student stu=new Student();
		stu.setNumber("140521203");
		stu.setName("张三");
		stu.setAge(19);
		stu.setSex("男");
		stu.setBirthday(new SimpleDateFormat("yyyy-MM-dd").parse("1996-03-20"));
		sd.addStudent(stu);
		List<Student> sl=sd.query();
		for (Student student : sl) {
			System.out.println(student.toString());
		}
	}
}

控制台报错：

Exception in thread "main" java.sql.SQLException: Could not retrieve transation read-only status server
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:951)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:941)
	at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3936)
	at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3907)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2408)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2375)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2359)
	at china_mozhu.dao.StudentDao.addStudent(StudentDao.java:28)
	at china_mozhu.action.StudentAction.main(StudentAction.java:21)
Caused by: java.sql.SQLException: Unknown system variable 'tx_read_only'
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4187)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4119)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2570)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2731)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2809)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2758)
	at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1612)
	at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3930)
	... 6 more