在maven中实现spring的jdbc模块

本项目是在maven中构建的,所以要在pom.xml中加入dependency


    
    
        mysql
        mysql-connector-java
        5.0.5
    

    
    
        org.springframework
        spring-web
        4.3.1.RELEASE
    
    
        org.springframework
        spring-webmvc
        4.3.1.RELEASE
    
    
        org.springframework
        spring-jdbc
        4.3.6.RELEASE
    



    
    
        c3p0
        c3p0
        0.9.1.2
    

    
    
        commons-dbcp
        commons-dbcp
        1.4
    
    


(1)数据库中有的字段名字,写进java文件中:

import java.io.Serializable;

/**
 * 数据库中的数据字段
 */
public class Emp implements Serializable{

    private int id;
    private String name;
    private String sex;
    private String age;
    private String tel;

    public Emp(){
        super();
    }
    public Emp(int id,String name,String sex,String age,String tel){
        super();
        this.id=id;
        this.name=name;
        this.sex=sex;
        this.age=age;
        this.tel=tel;
    }

    public int getId(){
        return id;
    }
    public void setId(int id){
        this.id=id;
    }

    public String getName(){
        return name;
    }
    public void setName(String name){
        this.name=name;
    }

    public String getSex(){
        return sex;
    }
    public void setSex(String sex){
        this.sex=sex;
    }

    public String getAge(){
        return age;
    }
    public void setAge(String age){
        this.age=age;
    }

    public String getTel(){
        return tel;
    }
    public void setTel(String tel){
        this.tel=tel;
    }

}


(2)定义接口(增删改查):

public interface EmpDao {
    /*插入的操作*/
    boolean insert(Emp entity);
    /*查询所有*/
    List findAll();
}

(3)实现上面接口的类(增删改查):

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

/**
 * 实现EmpDao接口的类
 */
public class EmpDaoImpl implements EmpDao {


    private JdbcTemplate jdbcTemplate;

    public EmpDaoImpl(JdbcTemplate jdbcTemplate){
        this.jdbcTemplate=jdbcTemplate;
    }

    @SuppressWarnings("unchecked")
    public List findAll() {
        // 定义返回结果
        List entities =new ArrayList();
        entities = (List) jdbcTemplate.query(
                "select id,name,sex from students", new RowMapper() {
                    public Object mapRow(ResultSet rs, int rowNum)
                            throws SQLException {
                        Emp emp = new Emp();
                        emp.setId(rs.getInt("id"));
                        emp.setName(rs.getString("name"));
                        emp.setSex(rs.getString("sex"));
                        return emp;
                    }
                });
        return entities;
    }

    //插入数据
    public boolean insert(Emp entity) {
        // 定义返回结果
        boolean flag = false;
        /* 插入实现 */
        int i = jdbcTemplate.update(
                "insert into students(id,name,sex,age,tel) values(?,?,?,?,?)",
                new Object[] { entity.getId(), entity.getName(),entity.getSex(),
                        entity.getAge(),entity.getTel()});
        if (i > 0) {
            flag = true;
        }
        return flag;
    }

}


(4)配置类:要进行数据库连接,数据的注入,把jdbcTemplate注入到EmpDaoImpl 中:

import org.apache.commons.dbcp.BasicDataSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.core.JdbcTemplate;

import javax.sql.DataSource;

/**
 * Created by Administrator on 2017/3/8.
 */
@Configuration
public class EmDaoConfig {

    @Bean
    public BasicDataSource dataSource(){
        BasicDataSource ds=new BasicDataSource();
        ds.setDriverClassName("com.mysql.jdbc.Driver");//加载驱动
        ds.setUrl("jdbc:mysql://localhost:3306/mydata?");
        ds.setUsername("root");
        ds.setPassword("86914381");
        ds.setInitialSize(5);   //池启动时创建的连接数量
        ds.setMaxActive(10);    //同一时间可以从池中分配的最多连接数。如果设置为0,则无限制
        return ds;
    }

    @Bean       //加入数据
    public JdbcTemplate jdbcTemplate(DataSource dataSource){
        return new JdbcTemplate(dataSource);
    }

    @Bean       //jdbcTemplate注入依赖
       public EmpDao empDaoImpl(JdbcTemplate jdbcTemplate){
        return new EmpDaoImpl(jdbcTemplate);
    }
}


(5)测试类:

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import java.util.List;

/**
 * 测试实例
 */
public class EmDaoTest {

    public static void main(String[] args){
        ApplicationContext ac=new AnnotationConfigApplicationContext(EmDaoConfig.class);
        //获取实例
        EmpDao ed = ac.getBean(EmpDao.class);

        List emps = ed.findAll();
        for(Emp emp:emps){
            System.out.println(
                    "ID::"+emp.getId()+"  Name::"+emp.getName()+" sex::"+emp.getSex());
        }

        //插入数据
        Emp emp=new Emp(20,"llqllq","男","10","15603004804");
        boolean flag=ed.insert(emp);
        if(flag){
            System.out.println("插入成功");
        }else{
            System.out.println("插入失败");
        }

    }
}


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