JDBC 数据库连接 创建表格、插入、查询、删除、修改数据 基本操作

package create_table_system;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import dbutil.DBUtil;

//建立表格建立表格建立表格建立表格
public class CreateTable {
public static void main(String[] args) {
Table();
}

public static void Table(){
//调用 DBUtil() 方法
Connection conn = DBUtil.open();
//建立数据库语句
String str ="create table  jj (  "
+ "Sno char(9) primary key,  "
+ "Sname char(10) unique, "
+ "Ssex char(2), Sage smallint, "
+ "Sdept char(20)  )";
try {
//Statement类
Statement sta = conn.createStatement();
//execute
sta.execute(str);

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

package create_table_system;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import java.text.SimpleDateFormat;

import dbutil.DBUtil;

public class Insert {
public static void main(String[] args){

Connection conn = DBUtil.open();
try {
Statement sta = conn.createStatement();
String str = "INSERT INTO `goddess` VALUES "
+ "('11', 'mei', '1', '22', '2015-12-12', "
+ "'xiaoxi@163.com', '13911111111', 'ADMIN', "
+ "'2015-01-08', 'ADMIN', '2015-01-08', '0')";

//这不是executeUpdata
sta.execute(str);

//关闭资源
sta.close();
conn.close();
DBUtil.close(conn);

} catch (SQLException e) {
e.printStackTrace();
}finally{
System.out.println("已经插入数据！");
}
}
}<span style="color:#ff0000;">
</span>

package create_table_system;

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

import dbutil.DBUtil;

//查询数据库！查询数据库！查询数据库！
public class Search {

public static void main(String[] args) {
try {
Connection conn = DBUtil.open();				//第三步：通过数据库的连接操作数据库，实现功能。
Statement sta = conn.createStatement();
ResultSet res = sta.executeQuery("select user_name,age,birthday,"
+ "email,mobile from goddess ");

//循环查询
while(res.next()){
System.out.println(
res.getString("user_name") +"   "
+ res.getString("age")      +"   "
+ res.getString("birthday")   +"   "
+ res.getString("email")     +"   "
+ res.getString("mobile")    +"   "
);

}
//关闭资源
res.close();
sta.close();
//关闭数据库连接
DBUtil.close(conn);
}
catch (SQLException e) {
System.out.println("您好！驱动加载失败！");
}finally{
System.out.print("查询方法已经执行");
}

}

}

package create_table_system;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import dbutil.DBUtil;

//数据库修改
public class Modify {

public static void main(String[] args) {
ModifyTo();
}

public static void  ModifyTo(){
Connection conn = DBUtil.open();
try {

Statement sta = conn.createStatement();
String sql = "update  goddess set user_name='程序员' where id=2 ";

sta.executeUpdate(sql);
//关闭资源
sta.close();
conn.close();

} catch (SQLException e) {
e.printStackTrace();
}finally{
System.out.println("数据已经修改成功！");
}
}

}