JDBC

JDBC

连接数据库的三种方法：

1、Driver  = new com.mysql.jdbc.Driver();

Properties   user password

Deiver.connect(url,pro)

2、Driver new com.mysql.jdbc.Driver()

       DriverManager.registerDriver(driver)

       DriverManager.getConnection()

3、Class.forName(“com.mysql.jdbc.Driver”);

DriverManager.getConnection()

加载配置文件properties：

       类.class.getResourceAsResult();

       只能加载，不能写，容易出问题。

DriverManager

       registerDriver

       getConnection

Connection

       Statement

              executeQuery

                     ResultSet

              executeUpdate

       PreparedStatement

              executeQuery

                     ResultSet

              executeUpdate

       CallableStatement

              executeQuery

                     ResultSet

preparedStatement与statement

缓存 高效 防攻击

ResultSet

Next()   getInt(1)或者getInt(“id”)