spring中利用jdbctemplate操作数据库

Posted 2020-10-11 努力奋斗吧

在此就以查询所有学生信息为例:
实体类

public class Student {
    private Integer id;
    private  String name;
    private Integer age;

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

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

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

dao层
public interface IStudentDAO {
    /**
     * 查询所有
     * @return
     */
    public List<Student> findAll();
}

dao层实现

public class StudentDAOImpl extends JdbcDaoSupport implements IStudentDAO{
    public List<Student> findAll() {

        final String sql="select *from Student";
        List<Student> list= this.getJdbcTemplate().query(sql, new RowMapper<Student>() {
          /**
           *
           * @param resultSet  单条记录读取器
           * @param i   索引
           * @return
           * @throws SQLException
           */
          public Student mapRow(ResultSet resultSet, int i) throws SQLException {
             Student student=new Student();
             student.setId(resultSet.getInt("id"));
             student.setName(resultSet.getString("name"));
             student.setAge(resultSet.getInt("age"));
              return student;
          }
      });
        return list;
    }
}

servie层接口

public interface IStudentService {
    /**
     * 查询所有
     * @return
     */
    public List<Student> findAll();
}

service层实现

public class StudentServiceImpl implements IStudentService{
    //植入dao
    private IStudentDAO dao;

    public IStudentDAO getDao() {
        return dao;
    }
    public void setDao(IStudentDAO dao) {
        this.dao = dao;
    }

    //查询所有
    public List<Student> findAll() {
        return dao.findAll();
    }
}

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///school
jdbc.username=root
jdbc.password=123156

配置applicationContextJdbdTempLate.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       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.xsd
        http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context.xsd

">
    <!--1.识别jdbc.properties-->
    <!--方式一-->
     <!-- <context:property-placeholder location="jdbc.properties"></context:property-placeholder>-->
    <!--方式二-->
    <bean class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties"></property>
    </bean>

    <!--2.数据源   spring内置数据源 DriverManagerDataSource-->
  <!--  <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>-->


    <!--数据源  bdcp-->
   <!-- <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>-->

    <!--数据源  c3p0-->
 <!--   <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driverClassName}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>-->

    <!--数据源  driud 阿里巴巴-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>


    <!--jdbctemplate配置-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!--dao层-->
    <bean id="studentDao" class="cn.happy.jdbctemplate.dao.impl.StudentDAOImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"></property>
    </bean>

  <!--  &lt;!&ndash;dao层&ndash;&gt;
    <bean id="studentDao" class="cn.happy.jdbctemplate.dao.impl.StudentDAOImpl">
        <property name="dataSource" ref="dataSource"></property>
    </bean>-->


    <!--service层-->
    <bean id="studentService" class="cn.happy.jdbctemplate.service.impl.StudentServiceImpl">
        <property name="dao" ref="studentDao"></property>
    </bean></beans>
测试类

@Test
public void testJdbc(){
    ApplicationContext context=new ClassPathXmlApplicationContext("applicationContextJdbdTempLate.xml");
    IStudentService student=(IStudentService)context.getBean("studentService");
    List<Student> list = student.findAll();
    for(Student item:list){
        System.out.println(item.getName() +item.getAge());
    }
}