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-6.0.6 ( Revision: 3dab84f4d9bede3cdd14d57b99e9e98a02a5b97d ) */ 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, @@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 NAMES utf8 ==>(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 stmt = conn.createStatement(); // 要执行的SQL语句 ResultSet rs1 = stmt.executeQuery("select * from nation"); ==>(cmd=mysql.ComQuery)select * from nation ResultSet rs2 = stmt.executeQuery("select * from region"); ==>(cmd=mysql.ComQuery)select * from region // 提交 conn.commit(); ==>(cmd=mysql.ComQuery)commit // 关闭连接
rs1.close();
rs2.close();
stmt.close(); conn.close(); ==>(cmd=mysql.ComQuery)rollback ==>(cmd=mysql.ComQuit))
在jdbc建立连接时，会获取服务器的参数，以下是TiDB2.0.0与mysql5.7的对比
可以看到基本上差异不大,有部分参数与数据库服务器设置有关。
[TiDB2.0.0]
auto_increment_increment=1 character_set_client=utf8 character_set_connection=utf8 character_set_results=latin1 character_set_server=latin1 init_connect= interactive_timeout=28800 license=Apache License 2.0 lower_case_table_names=2 max_allowed_packet=67108864 net_buffer_length=16384 net_write_timeout=60 query_cache_size=1048576 query_cache_type=OFF sql_mode=STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION system_time_zone=CST time_zone=SYSTEM tx_isolation=REPEATABLE-READ wait_timeout=28800
[Mysql5.7]
auto_increment_increment=1 character_set_client=utf8 character_set_connection=utf8 character_set_results=null character_set_server=utf8 init_connect=SET NAMES utf8 interactive_timeout=28800 license=GPL lower_case_table_names=0 max_allowed_packet=4194304 net_buffer_length=16384 net_write_timeout=60 query_cache_size=1048576 query_cache_type=OFF sql_mode=ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION system_time_zone=CST time_zone=SYSTEM tx_isolation=REPEATABLE-READ wait_timeout=28800
posted on
2018-06-06 10:29 猫不急 阅读(
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