注册jdbc驱动程序的三种方式

注册jdbc驱动程序的三种方式 1、比较常用try{ Class.forName("com.mysql.jdbc.Driver");//加载数据库驱动 String url="jdbc:mysql://localhost:3306/databasename";//数据库连接子协议 Connection conn=DriverManager.getConnection(url,"username","password"); Statement
stmt=conn.createStatement(); ResultSet rs=stmt.executeQuery("select * from tablename"); while(rs.next()){//不断指向下一条记录 System.out.println("DeptNo:"+rs.getInt(1)); System.out.println("\tDeptName:"+rs.getString(2)); System.out.println("\tLOC:"+rs.getString(3));}
rs.close(); stmt.close(); conn.close();}catch(ClassNotFoundException e){ System.out.println("找不到指定的驱动程序类！");}catch(SQLException e){ e.printStackTrace();}2、通过系统的属性设置try{
System.setProperty("jdbc.driver","com.mysql.jdbc.Driver");//系统属性指定数据库驱动 String url="jdbc:mysql://localhost:3306/databasename";//数据库连接子协议 Connection conn=DriverManager.getConnection(url,"username","password"); Statement stmt=conn.createStatement();
ResultSet rs=stmt.executeQuery("select * from tablename"); while(rs.next()){//不断指向下一条记录 System.out.println("DeptNo:"+rs.getInt(1)); System.out.println("\tDeptName:"+rs.getString(2)); System.out.println("\tLOC:"+rs.getString(3));} rs.close(); stmt.close();
conn.close();}catch(SQLException e){ e.printStackTrace();}3、看起来比较直观的一种方式，注册相应的db的jdbc驱动，3在编译时需要导入对应的libtry{ new com.mysql.jdbc.Driver();//创建driver对象，加载数据库驱动 String url="jdbc:mysql://localhost:3306/databasename";//数据库连接子协议
Connection conn=DriverManager.getConnection(url,"username","password"); Statement stmt=conn.createStatement(); ResultSet rs=stmt.executeQuery("select * from tablename"); while(rs.next()){//不断指向下一条记录 System.out.println("DeptNo:"+rs.getInt(1)); System.out.println("\tDeptName:"+rs.getString(2));
System.out.println("\tLOC:"+rs.getString(3));} rs.close(); stmt.close(); conn.close();}catch(SQLException e){ e.printStackTrace();}