直接注册驱动：
Class.forName("com.mysql.jdbc.Driver");
//实现
try {
Class.forName("com.mysql.jdbc.Driver");
String url="jdbc:mysql://localhost:3306/test";
Connection con= DriverManager.getConnection(url, "root", "123");
System.out.println(con);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}2.通过DriverManager.registerDriver()注册驱动
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//实现
String url="jdbc:mysql://localhost:3306/test";
//extends Hashtable<Object,Object>
Properties info=new Properties();
info.setProperty("user", "root");
info.setProperty("password", "123");
//向驱动管理器注册驱动 ，是把mysql驱动类的对象放置到集合中
try {
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
Connection con=DriverManager.getConnection(url, info);
System.out.println(con);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}3.新建厂商实现的com.mysql.jdbc.Driver类
java.sql.Driver driver=new com.mysql.jdbc.Driver();
//实现：
try {
//com.mysql.jdbc.Driver是Java.sql.Driver的厂商的实现
java.sql.Driver driver=new com.mysql.jdbc.Driver();
//要连接到的数据库的URL
String url="jdbc:mysql://localhost:3306/test";
//extends Hashtable<Object,Object>
Properties info=new Properties();
info.setProperty("user", "root");
info.setProperty("password", "123");
//获取connection连接
Connection con=driver.connect(url, info);
System.out.println(con.toString());
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}驱动注册成功之后，基本上可以通过DriverManager.getConnection(url,user,password)来获取数据库的连接
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();
}//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();
}//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();
}
