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纯java方式连接数据库简单操作
//JDBC全称java datebese connection --java数据库连接
package com.beiwo;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ResourceBundle;
/*数据库帮助类*/
public class DBUtils {
private static String driverClass;
private static String url;
private static String user;
private static String password;
static{
ResourceBundle rb=ResourceBundle.getBundle("jdbc");
driverClass=rb.getString("driverClass");
url=rb.getString("url");
user=rb.getString("user");
password=rb.getString("password");
try {
//加载驱动
Class.forName(driverClass);
} catch (Exception e) {
e.printStackTrace();
}
}
public static Connection getConn() throws SQLException{
return DriverManager.getConnection(url, user, password);
}
public static void closeAll(ResultSet rs,Statement stme,Connection conn){
if (null!=rs) {
try {
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (null!=rs) {
try {
stme.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (null!=rs) {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
package com.beiwo;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
public class MasterCurd {
public static void findAll(){
Connection conn=null;
Statement stme=null;
ResultSet rs=null;
String sql="SELECT * FROM master";
//加载驱动
try {
//Class.forName("com.mysql.jdbc.Driver");
System.out.println("加载成功");
conn=DBUtils.getConn();
stme= conn.createStatement();
rs= stme.executeQuery(sql);
while (rs.next()) {
System.out.println(rs.getObject(1));
System.out.println(rs.getObject(2));
System.out.println(rs.getObject(3));
System.out.println(rs.getObject(4));
System.out.println("=============================");
}
} catch (Exception e) {
}finally{
DBUtils.closeAll(rs, stme, conn);
}
}
//插入
public static void Insert (){
Connection conn=null;
Statement stme=null;
String sql="INSERT INTO master (name, password, money) VALUES (‘张政‘,‘123‘, 100)";
try {
//获得连接对象
conn= DBUtils.getConn();
System.out.println("连接成功");
//获取Statement对象
stme=conn.createStatement();
//执行语句
stme.execute(sql);
} catch (Exception e) {
e.printStackTrace();
}finally{
DBUtils.closeAll(null, stme, conn);
}
}
//更新
public static void Update(){
Connection conn=null;
Statement stme=null;
String sql="UPDATE master SET name=‘张军‘,money=50 WHERE id=6";
try {
//获得连接对象
conn= DBUtils.getConn();
System.out.println("连接成功");
//获取Statement对象
stme=conn.createStatement();
//执行语句
stme.executeUpdate(sql);
} catch (Exception e) {
e.printStackTrace();
}finally{
DBUtils.closeAll(null, stme, conn);
}
}
//删除
public static void Delete(){
Connection conn=null;
Statement stme=null;
String sql="DELETE FROM master WHERE id=7";
try {
//获得连接对象
conn= DBUtils.getConn();
System.out.println("连接成功");
//获取Statement对象
stme=conn.createStatement();
//执行语句
stme.executeUpdate(sql);
} catch (Exception e) {
e.printStackTrace();
}finally{
DBUtils.closeAll(null, stme, conn);
}
}
}
package com.beiwo;
/*import org.junit.Before;*/
import org.junit.Test;
public class TestMasterCrud {
/* MasterCurd curd=null;
@Before
在前面运行
public void befor(){
curd=new MasterCurd();
}*/
@Test
public void testFindAll(){
MasterCurd.findAll();
}
@Test
public void Insert(){
MasterCurd.Insert();
}
@Test
public void Update(){
MasterCurd.Update();
}
@Test
public void Delete(){
MasterCurd.Delete();
}
}
} }
纯java方式连接数据库简单操作
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