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  • JDBC增删改查和查唯一的完整代码

    第一部分代码(实体类)

    package com.wf.entity;

    public class Hehe{

    private int hehe_id;

    private String hehe_name;

    private String hehe_gender;

    public int getHehe_id(){

    return hehe_id;

    }

    public void setHehe_id(int heheId){

    hehe_id=heheId;

    }

    public String getHehe_name() {
    return hehe_name;
    }
    public void setHehe_name(String heheName) {
    hehe_name = heheName;
    }
    public String getHehe_gender() {
    return hehe_gender;
    }
    public void setHehe_gender(String heheGender) {
    hehe_gender = heheGender;
    }

    }

    第二部分 BaseDao(增删改查和查唯一)

    package com.wf.dao;

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

    public class BaseDao{

    protected static final String DRIVER="com.mysql.jdbc.Driver";

    protected static final String URL="mysql://localhost:3306/mysql";

    protected static final String USER="root";

    protected static final String PASSWORD="******";

    protected Connection connection=null;

    protected PreparedStatement preparedStatement=null;

    protected ResultSet resultSet =null;

    protected void getconnection() throws ClassNotFoundException, SQLException{

       Class.forName(DRIVER);

       this.connection =DriverManager.getconnection (URL,USER,PASSWORD);

    }

    /**
    * 通用的增删改方法
    * @param sql SQL语句
    * @param params 参数数组
    * @return 受影响的行数
    */

    protected int executeUpdate(String sql ,String[]params){
    int result=-1;
    try {
    this.getconnection();
    this.preparedStatement=this.connection.prepareStatement(sql);
    if(null!=params){
    for (int i = 0; i < params.length; i++) {

    this.preparedStatement.setString(i+1, params[i]);


    }

    }
    result= this.preparedStatement.executeUpdate();
    } catch (ClassNotFoundException e) {

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

    e.printStackTrace();
    }finally{
    this.close();
    }
    return result;
    }

    /**
    * 查询结果集的方法
    * @param sql
    * @param params
    */
    protected void executeQuery(String sql,String[]params){

    try {
    this.getconnection();
    this.preparedStatement=this.connection.prepareStatement(sql);
    if(null!=params){
    for (int i = 0; i < params.length; i++) {
    this.preparedStatement.setString(i+1, params[i]);
    }

    }
    this.resultSet=this.preparedStatement.executeQuery();
    } catch (ClassNotFoundException e) {

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

    e.printStackTrace();
    }

    }

    /**
    * 查询唯一的结果
    * @return Object
    */
    protected Object executeQueryUnique(String sql,String[]params){
    Object object=null;
    try {
    this.getconnection();
    this.preparedStatement=this.connection.prepareStatement(sql);
    if(null!=params){
    for (int i = 0; i < params.length; i++) {
    this.preparedStatement.setString(i+1, params[i]);
    }

    }
    this.resultSet=this.preparedStatement.executeQuery();
    if(this.resultSet.next())

    object=this.resultSet.getObject(1);
    } catch (ClassNotFoundException e) {

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

    e.printStackTrace();
    }

    return object;
    }


    protected void close(){
    try {
    if(null!=this.resultSet)
    this.resultSet.close();
    if(null!=this.preparedStatement)
    this.preparedStatement.close();
    if(null!=this.connection)
    this.connection.close();
    } catch (SQLException e) {

    e.printStackTrace();
    }

    }

    第三部分 HeheDao

    package com.wf.dao;

    import java.sql.Connection;
    import java.sql.PreparedStatement;
    import java.sql.SQLException;

    import com.wf.entity.Hehe;

    public class HeheDao extends BaseDao{
    public boolean insert(Hehe hehe){


    String sql="insert into hehe(hehe_name,hehe_gender) values(?,?)" ;
    String []params=new String[]{hehe.getHehe_name(),hehe.getHehe_gender()};
    return this.executeUpdate(sql, params)>0? true:false;

    }

    第四部分 测试Test_BaseDao_Insert

    package com.wf.test;

    import com.wf.dao.HeheDao;
    import com.wf.entity.Hehe;

    public class Test_BaseDao_Insert {
    public static void main(String[] args) {
    Hehe hehe=new Hehe();

    hehe.setHehe_name("个");
    hehe.setHehe_gender("b");

    HeheDao _hd=new HeheDao();
    if(_hd.insert(hehe))
    System.out.println("成功!");
    else
    System.out.println("失败!");
    }

    }

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  • 原文地址:https://www.cnblogs.com/wffj150926/p/6219908.html
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