Mysql, sqlserver Oracle database connection mode

Programming connection mode

sql server The default port number is ：1433
URL:"jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=dbname"

DRIVERNAME:"com.microsoft.jdbc.sqlserver.SQLServerDriver";

mysql The default port number is ：3306

URL:jdbc:mysql://localhost:3306/test?         user=root&password=&useUnicode=true&characterEncoding=gbk

DRIVERNAME:"com.mysql.jdbc.Driver";

oracle The default port number is ：1521

URL:"jdbc:oracle:thin:@localhost :1521:orcl";

DRIVERNAME:"oracle.jdbc.driver.OracleDriver";

DOS yes Disk Operation System For short , Meaning for Disk operating system

Create a table and add comments  

CREATE TABLE `t_account_phone_pool` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `create_time` datetime DEFAULT NULL COMMENT ' Creation time ',
  `update_time` datetime DEFAULT NULL COMMENT ' Modification time ',
  `is_enable` tinyint(1) NOT NULL DEFAULT '1' COMMENT ' Data available  0： Unavailable ;1： You can use ',
  `is_delete` tinyint(1) NOT NULL DEFAULT '0' COMMENT ' Logical deletion  0： Not delete ;1： Delete ',
  `create_user` varchar(20) DEFAULT NULL COMMENT ' founder ',
  `update_user` varchar(20) DEFAULT NULL COMMENT ' Modifier ',
  `account_name` varchar(20) NOT NULL COMMENT ' Account name ',
  `phone` varchar(20) NOT NULL COMMENT ' number ',
  `send_limit_count` int(11) NOT NULL COMMENT ' Send limit times ',
  PRIMARY KEY (`id`),
  KEY `idx_phone_account_name` (`phone`,`account_name`),
  KEY `idx_phone` (`phone`),
  KEY `idx_account_name` (`account_name`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8 COMMENT=' Account number - Number pool table ';

Command to view field comments in the table （ explain ）

show full columns from tablename;