Spring dbcp連接池配置與示例（以及JDBCTemplate的使用）

Apache的DBCP

首先要導入的jar包：

dbpc需要的包：

除了Spring核心包之外的jar包：

我們要做的示例：（利用dbcp連接池實現對t_student表的增刪改查）

廢話不多少，上xml配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-4.3.xsd">
    
    <!-- 讀取jdbc.properties文件 -->
    <context:property-placeholder location="jdbc.properties"/>
    <!-- Spring dbcp連接池配置，配置數據源 -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>
    <!-- 導入Springjdbc -->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <!-- 引入數據源，也就是連接池配置 -->
        <property name="dataSource" ref="dataSource"></property>
    </bean>
  
    <!-- 實例化兩個接口 -->
    <bean id="studentDao" class="com.maya.daoImp.StudentDaoImpl">
        <!-- 在dao類中注入Spring的jdbcTemplate -->
        <property name="jdbcTemplate" ref="jdbcTemplate"></property>
    </bean>     
    <bean id="studentService" class="com.maya.serviceImp.StudentServiceImpl">
        <property name="studentDao" ref="studentDao"></property>
    </bean>
</beans>

 jdbc.properties文件

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/hibernate?characterEncoding=GBK
jdbc.username=root
jdbc.password=

model類

package com.maya.model;

public class Student {

    private int id;
    private String name;
    private int age;
    public Student() {
        super();
        // TODO Auto-generated constructor stub
    }
    public Student(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }
    public Student(int id, String name, int age) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
    }
    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 int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    @Override
    public String toString() {
        return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
}

dao類接口就不在這里貼了，直接貼其的實現類

package com.maya.daoImp;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowCallbackHandler;
import com.maya.dao.StudentDao;
import com.maya.model.Student;

public class StudentDaoImpl implements StudentDao{
    //利用Spring的jdbc對其進行crud操作
    private JdbcTemplate jdbcTemplate;
    
    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }
    @Override
    public int addStudent(Student student) {
        String sql="insert into t_student values(null,?,?)";
        //因為Spring的jdbc對原生jdbc進行了封裝，在這里給出的是數組方式，當然其底層也是需要將數組進行遍歷
        Object []params=new Object[]{student.getName(),student.getAge()};
        return jdbcTemplate.update(sql,params);
    }
    @Override
    public int updateStudent(Student student) {
        String sql="update t_student set name=?,age=? where id=?";
        Object []params=new Object[]{student.getName(),student.getAge(),student.getId()};
        //傳入兩個參數
        return jdbcTemplate.update(sql,params);
    }
    @Override
    public int deleteStudent(int id) {
        String sql="delete from t_student where id=?";
        Object []params=new Object[]{id};
        return jdbcTemplate.update(sql,params);
    }
    @Override
    public List<Student> findStudents() {
        String sql="select * from t_student";
        //這里的list對象必須是個final常量
        final List<Student> studentList=new ArrayList<Student>();
        //同樣也是傳入兩個參數，
        //第二個參數：是一個回掉方法，我們要實現它的processRow方法
        jdbcTemplate.query(sql, new RowCallbackHandler(){
            @Override
            public void processRow(ResultSet rs) throws SQLException {
                //同jdbc一樣也是要在其中把結果集遍歷出來，賦值給新對象
                Student student=new Student();
                student.setId(rs.getInt("id"));
                student.setName(rs.getString("name"));
                student.setAge(rs.getInt("age"));
                studentList.add(student);
            }            
        });
        return studentList;
    }
}

service的接口也不再這里貼了，直接貼其實現類

package com.maya.serviceImp;

import java.util.List;

import com.maya.dao.StudentDao;
import com.maya.model.Student;
import com.maya.service.StudentService;


public class StudentServiceImpl implements StudentService{
    private StudentDao studentDao;
    public void setStudentDao(StudentDao studentDao) {
        this.studentDao = studentDao;
    }
    
    //當調用該邏輯時，將其執行的結果條數返回
    @Override
    public int addStudent(Student student) {
        return studentDao.addStudent(student);
    }
    @Override
    public int updateStudent(Student student) {
        return studentDao.updateStudent(student);
    }
    @Override
    public int deleteStudent(int id) {
        return studentDao.deleteStudent(id);
    }
    @Override
    public List<Student> findStudents() {
        return studentDao.findStudents();
    }
}

測試類

package com.maya.test;
import java.util.List;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.maya.model.Student;
import com.maya.service.StudentService;
import junit.framework.TestCase;
public class T extends TestCase {

    private ApplicationContext ac;

    @Before//利用前置通知執行
    public void setUp() throws Exception {
        ac=new ClassPathXmlApplicationContext("beans.xml");
    }
    @Test
    public void testaddStudent() {
        StudentService studentService=(StudentService)ac.getBean("studentService");
        int addNums=studentService.addStudent(new Student("王五", 1));
        if(addNums==1){
            System.out.println("添加成功");
        }
    }    
    @Test
    public void testupdateStudent() {
        StudentService studentService=(StudentService)ac.getBean("studentService");
        int updateNums=studentService.updateStudent(new Student(3,"王五2", 2));
        if(updateNums==1){
            System.out.println("更新成功");
        }
    }    
    @Test
    public void testdeleteStudent() {
        StudentService studentService=(StudentService)ac.getBean("studentService");
        int deleteNums=studentService.deleteStudent(3);
        if(deleteNums==1){
            System.out.println("刪除成功");
        }
    }    
    @Test
    public void testfindStudents() {
        StudentService studentService=(StudentService)ac.getBean("studentService");
        List<Student> studentList=studentService.findStudents();
        for(Student student:studentList){
            System.out.println(student);
        }
    }
}

***************************************************************************************************************** 

如何使用JDBCTemplate（在上面已經列出了其增刪改查的使用方式，這里在介紹一下xml文件中的配置和查詢單個對象，多個對象集合）

　　<!-- 配置JDBCTemplate -->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!-- 命名的JDBCTemplate -->
    <bean id="namedParameterJdbcTemplate" class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">
        <constructor-arg name="dataSource" ref="dataSource"></constructor-arg>
    </bean>

查詢

package com.itnba.maya.test;

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

import javax.sql.DataSource;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;

import com.itnba.maya.entities.Nation;
import com.mchange.v2.c3p0.ComboPooledDataSource;

public class TestC3P0 {
    
public static void main(String[] args) throws Exception{
        
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        DataSource ds = (DataSource) context.getBean("dataSource");
        JdbcTemplate j = (JdbcTemplate)context.getBean("jdbcTemplate");
        
        String sql = "select count(*) from nation";
        //查詢單行單列
        long count = j.queryForObject(sql, Long.class);

        System.out.println(count);
        
    }
    
    public static void main77(String[] args) throws Exception{
        
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        DataSource ds = (DataSource) context.getBean("dataSource");
        JdbcTemplate j = (JdbcTemplate)context.getBean("jdbcTemplate");
        
        String sql = "select * from nation";
        //查詢多行
        RowMapper<Nation> rowMapper = new BeanPropertyRowMapper<Nation>(Nation.class);
        List<Nation> list = j.query(sql, rowMapper);
        
        for(Nation data : list){
            System.out.println(data);
        }
        
    }
    
    public static void main66(String[] args) throws Exception{
        
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        DataSource ds = (DataSource) context.getBean("dataSource");
        JdbcTemplate j = (JdbcTemplate)context.getBean("jdbcTemplate");
        
        String sql = "select * from nation where code=?";
        //查詢單個
        RowMapper<Nation> rowMapper = new BeanPropertyRowMapper<Nation>(Nation.class);
        Nation data = j.queryForObject(sql,rowMapper,"n003");
        
        System.out.println(data);
        
    }

}