注册jdbc驱动程序的三种方式

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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lib

try{       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();}

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