JDBC--最简单的java连接数据库的小程序

CREATE TABLE user_t (
id INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
name VARCHAR(50) NOT NULL DEFAULT '',
password VARCHAR(50) NOT NULL DEFAULT '',
email VARCHAR(50) NOT NULL DEFAULT '',
PRIMARY KEY (id)
)  ENGINE=INNODB DEFAULT CHARSET=UTF8;

insert into user_t (id,name,password,email) values
('1','tom','123','tom@163.com'),
('2','jack','456','jack@163.com');

package JdbcPrictice;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class MyJdbc {

public static void main(String[] args) {

String  sql="Select*from user_t";

Connection con=null;
Statement st=null;
ResultSet rs=null;

try {

Class.forName("com.mysql.jdbc.Driver");
System.out.println("数据库驱动加载成功");

con=DriverManager.getConnection("jdbc:mysql://localhost:3306/new_prictice","root","");
System.out.println("数据库连接成功");
st=con.createStatement();

rs=st.executeQuery(sql);

while(rs.next()){

System.out.print(rs.getInt("id")+"   ");
System.out.print(rs.getString("name")+"  ");
System.out.print(rs.getString("password")+"  ");
System.out.print(rs.getString("email")+"   ");
System.out.println();

}

} catch (Exception e) {

e.printStackTrace();

}finally{

try {
rs.close();

} catch (Exception e2) {
e2.printStackTrace();
}
try {
st.close();

} catch (Exception e2) {
e2.printStackTrace();
}
try {
con.close();

} catch (Exception e2) {
e2.printStackTrace();
}

}

}

}