MySql用statement实现DDL,DML,DQL的操作Demo

Connection connection=null;
Statement stmt=null;
int result=-1;

try {
Class.forName("com.mysql.jdbc.Driver");

} catch (ClassNotFoundException e) {

e.printStackTrace();
}

try {
//创建连接
String url="jdbc:mysql://localhost:3306/jdbcdb";
connection= DriverManager.getConnection(url, "root", "mysql");
} catch (SQLException e) {

e.printStackTrace();
}

try {
//创建Statement
String sql="CREATE TABLE s_user(id INT PRIMARY KEY AUTO_INCREMENT,    NAME VARCHAR(20),PASSWORD VARCHAR(15)) ";
stmt=connection.createStatement();
//执行sql语句，返回受影响行数 ————int值
result= stmt.executeUpdate(sql);
} catch (SQLException e) {

e.printStackTrace();
}

System.out.println("result="+result);

try {
//关闭流
if(stmt!=null)
{
stmt.close();
}

if(connection!=null)
{
connection.close();
}

} catch (SQLException e) {

e.printStackTrace();
}

Connection connection=null;
Statement stmt=null;
ResultSet rSet=null;
try {
Class.forName("com.mysql.jdbc.Driver");
String url="jdbc:mysql://localhost:3306/jdbcdb";
String user="root";
String password="mysql";
//连接
connection= DriverManager.getConnection(url, user, password);
stmt= connection.createStatement();//statement
String sql="SELECT * from s_user;";
rSet= stmt.executeQuery(sql);//执行sql语句---数据集（类似于map）

while (rSet.next()) {
//获取值（通过索引）
int id= rSet.getInt(1);
String name=rSet.getString(2);
String pwd=rSet.getString(3);

System.out.println("id="+id+";name="+name+";pwd="+pwd);
//通过行列号
id=rSet.getInt("id");
name=rSet.getString("name");
pwd=rSet.getString("password");

System.out.println("~~~~~~~id="+id+";name="+name+";pwd="+pwd);

}

} catch