java对数据库的增删改查_在java中对数据库进行增删改查
代码区域：
package com.oracle.jdbc.demo1;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class JDBCDemo {
//四个属性(四个常量的字符串)
/*
jdbcName
url
user
password
*/
private static final String jdbcName="com.mysql.jdbc.Driver";
private static final String url="jdbc:mysql://127.0.0.1:3306/emp_dept";
private static final String user="root";
private static final String password="123456";
/*
* 一个类(DriverManeger)四个接口(Connection、)
* */
public static void main(String[] args) {
// TODO Auto-generated method stub
Connection conn=null;
try {
Class.forName(jdbcName);
conn=DriverManager.getConnection(url, user, password);
//获得conn就表示获取了数据库的连接
System.out.println("连接数据库成功");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
2.在java中向数据库添加数据
第一种方法：添加数据
代码区域：
package com.oracle.jdbc.demo2;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
public class JDBCAdd {
private static final String jdbcName="com.mysql.jdbc.Driver";
private static final String url="jdbc:mysql://127.0.0.1:3306/emp_dept";
private static final String user="root";
private static final String password="123456";
/*
* 一个类(DriverManeger)四个接口(Connection、PreparedStatement、)
* */
public static void main(String[] args) {
// TODO Auto-generated method stub
Connection conn=null;
try {
Class.forName(jdbcName);
conn=DriverManager.getConnection(url, user, password);
//增加数据的操作
String name="田雨";
String sex="女";
String sql="insert into person values(null,‘"+name+"‘,‘"+sex+"‘)";
PreparedStatement pst=conn.prepareStatement(sql); //准备执行sql语句
int i=pst.executeUpdate(); //返回成功插入数据的行数
System.out.println("成功添加了"+i+"条记录");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
第二中方法：添加数据
代码区域：
package com.oracle.jdbc.demo2;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
public class JDBCAdd2 {
private static final String jdbcName="com.mysql.jdbc.Driver";
private static final String url="jdbc:mysql://127.0.0.1:3306/emp_dept";
private static final String user="root";
private static final String password="123456";
/*
* 一个类(DriverManeger)四个接口(Connection、PreparedStatement、)
* */
public static void main(String[] args) {
// TODO Auto-generated method stub
Connection conn=null;
try {
Class.forName(jdbcName);
conn=DriverManager.getConnection(url, user, password);
//增加数据的操作
String name="田雨2";
String sex="女";
String sql="insert into person values(null,?,?)";
PreparedStatement pst=conn.prepareStatement(sql); //准备执行sql语句
pst.setString(1, name); //填充第1个问好
pst.setString(2, sex); //填充第2个问好
int i=pst.executeUpdate(); //返回成功插入数据的行数
System.out.println("成功添加了"+i+"条记录");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
3.在java中修改数据库的内容
代码区域：
package com.oracle.jdbc.demo3;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
public class JDBCModify {
private static final String jdbcName="com.mysql.jdbc.Driver";
private static final String url="jdbc:mysql://127.0.0.1:3306/emp_dept";
private static final String user="root";
private static final String password="123456";
/*
* 一个类(DriverManeger)四个接口(Connection、PreparedStatement、)
* */
public static void main(String[] args) {
// TODO Auto-generated method stub
Connection conn=null;
try {
Class.forName(jdbcName);
conn=DriverManager.getConnection(url, user, password);
//修改数据的操作
int id=2;
String name="王希宝";
String sex="男";
String sql="update person set name=?,sex=? where id=?";
PreparedStatement pst=conn.prepareStatement(sql); //准备执行sql语句
pst.setString(1, name); //填充第1个问好
pst.setString(2, sex); //填充第2个问好
pst.setInt(3, id);
int i=pst.executeUpdate(); //返回成功修改数据的行数
System.out.println("成功修改了"+i+"条记录");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
4.在java中删除数据库的内容
代码区域：
package com.oracle.jdbc.demo4;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
public class JDBCDel {
private static final String jdbcName="com.mysql.jdbc.Driver";
private static final String url="jdbc:mysql://127.0.0.1:3306/emp_dept";
private static final String user="root";
private static final String password="123456";
/*
* 一个类(DriverManeger)四个接口(Connection、PreparedStatement、)
* */
public static void main(String[] args) {
// TODO Auto-generated method stub
Connection conn=null;
try {
Class.forName(jdbcName);
conn=DriverManager.getConnection(url, user, password);
//删除数据的操作
int id=2;
String sql="delete from person where id=?";
PreparedStatement pst=conn.prepareStatement(sql); //准备执行sql语句
pst.setInt(1, id);
int i=pst.executeUpdate(); //返回成功删除数据的行数
System.out.println("成功删除了"+i+"条记录");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
5.在java中查看数据库的内容
代码区域：
package com.oracle.jdbc.demo5;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class JDBCFindAll {
private static final String jdbcName="com.mysql.jdbc.Driver";
private static final String url="jdbc:mysql://127.0.0.1:3306/emp_dept";
private static final String user="root";
private static final String password="123456";
/*
* 一个类(DriverManeger)四个接口(Connection、PreparedStatement、ResultSet、)
* */
public static void main(String[] args) {
// TODO Auto-generated method stub
Connection conn=null;
try {
Class.forName(jdbcName);
conn=DriverManager.getConnection(url, user, password);
//查询数据的操作
String sql="select id,name,sex from person";
PreparedStatement pst=conn.prepareStatement(sql); //准备执行sql语句
ResultSet rs=pst.executeQuery();
while(rs.next()){
int id=rs.getInt("id");
String name=rs.getString("name");
String sex=rs.getString("sex");
System.out.println(id+" "+name+" "+sex);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
在java中对数据库进行增删改查
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本文系统来源：https://www.cnblogs.com/lxy151/p/8124829.html