1. Load the Driver
1. Class.forName() | Class.forName().newInstance() | new DriverName()
2. 实例化时自动向DriverManager注册,不需显式调用DriverManager.registerDriver方法
2. Connect to the DataBase
DriverManager.getConnection()
3. Execute the SQL
1. Connection.CreateStatement()
2. Statement.executeQuery()
3. Statement.executeUpdate()
4. Retrieve the result data
循环去的结果 while(rs.next())
5. Show the result data
将数据库中的各种类型转换为Java中的类型(getXXX方法)
6. Close
1. close the resultSet;
2. close the statement;
3. close the connection;