jdbc与TiDB数据库交互的过程

以下是使用jdbc操作TiDB数据库，得到的交互过程和指令的说明

==>代表发送给数据库的指令

// 加载驱动程序
Class.forName(driver);

// 连接数据库
Connection conn = DriverManager.getConnection(url, user, password);
==>(cmd=mysql.ComQuery)/* mysql-connector-java-5.1.45 ( Revision: 9131eefa398531c7dc98776e8a3fe839e544c5b2 ) */
    SELECT  @@session.auto_increment_increment AS auto_increment_increment, @@character_set_client AS character_set_client, @@character_set_connection AS character_set_connection, 
            @@character_set_results AS character_set_results, @@character_set_server AS character_set_server, @@collation_server AS collation_server, @@init_connect AS init_connect, 
            @@interactive_timeout AS interactive_timeout, @@license AS license, @@lower_case_table_names AS lower_case_table_names, @@max_allowed_packet AS max_allowed_packet, 
            @@net_buffer_length AS net_buffer_length, @@net_write_timeout AS net_write_timeout, @@query_cache_size AS query_cache_size, @@query_cache_type AS query_cache_type, 
            @@sql_mode AS sql_mode, @@system_time_zone AS system_time_zone, @@time_zone AS time_zone, @@tx_isolation AS tx_isolation, @@wait_timeout AS wait_timeout
==>(cmd=mysql.ComQuery)SET character_set_results = NULL
==>(cmd=mysql.ComQuery)SET autocommit=1 

// 关闭自动提交
conn.setAutoCommit(false);
==>(cmd=mysql.ComQuery)SET autocommit=0 

// 创建statement用来执行SQL语句 
Statement statement = conn.createStatement(); 

// 要执行的SQL语句 
ResultSet rs1 = statement.executeQuery("select * from nation");
==>(cmd=mysql.ComQuery)select * from nation

ResultSet rs2 = statement.executeQuery("select * from region");
==>(cmd=mysql.ComQuery)select * from region

// 提交
conn.commit();
==>(cmd=mysql.ComQuery)commit

// 关闭连接
conn.close()
==>(cmd=mysql.ComQuery)rollback
==>(cmd=mysql.ComQuit))