1.jdbc.properteis   :  参数配置文件

 

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///spring1
jdbc.username=root
jdbc.password=root

2.  applicationContext.xml :  核心配置文件

<?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:contxt="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/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--  引入配置文件   -->
  <contxt:property-placeholder location="jdbc.properteis"/>
    <!--配置 c3p0 连接池  -->
    <!--c3p0-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!--        <property name="driverClass" value="com.mysql.jdbc.Driver"/>-->
<!--        <property name="jdbcUrl" value="jdbc:mysql:///spring1"/>-->
<!--        <property name="user" value="root"/>-->
<!--        <property name="password" value="root"/>-->
    <property name="driverClass" value="${jdbc.driver}"/>
    <property name="jdbcUrl" value="${jdbc.url}"/>
    <property name="user" value="${jdbc.username}"/>
     <property name="password" value="${jdbc.password}"/>
    </bean>
<!--  配置druid    -->
   <bean id="druid" class="com.alibaba.druid.pool.DruidDataSource">
    <property name="driverClassName" value="${jdbc.driver}"/>
    <property name="url"  value="${jdbc.url}" />
    <property name="username"  value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>
<!--       <property name="driverClassName" value="com.mysql.jdbc.Driver"/>-->
<!--       <property name="url" value="jdbc:mysql:///spring1"/>-->
<!--       <property name="username" value="root"/>-->
<!--       <property name="password" value="root"/>-->
   </bean>
<!-- <bean id="dataSource" class=""></bean>-->

    <!--配置JdbcTemplate-->
    <!--   使用  c3p0  连接池   -->
   <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
     <constructor-arg name="dataSource"   ref="druid" />
   </bean>
</beans>

3.     maven  :   pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.zengjx</groupId>
    <artifactId>day38spring_jdbctemplate</artifactId>
    <version>1.0-SNAPSHOT</version>

   <dependencies>
       <dependency>
           <groupId>org.springframework</groupId>
           <artifactId>spring-context</artifactId>
           <version>5.1.2.RELEASE</version>
       </dependency>
       <dependency>
           <groupId>org.springframework</groupId>
           <artifactId>spring-jdbc</artifactId>
           <version>5.1.2.RELEASE</version>
       </dependency>
       <dependency>
           <groupId>org.springframework</groupId>
           <artifactId>spring-aop</artifactId>
           <version>5.1.2.RELEASE</version>
       </dependency>
       <dependency>
<!--      数据库     -->
           <groupId>mysql</groupId>
           <artifactId>mysql-connector-java</artifactId>
           <version>5.1.47</version>
       </dependency>
       <dependency>

           <!--  spring  整合    juinit    -->
           <groupId>org.springframework</groupId>
           <artifactId>spring-test</artifactId>
           <version>5.1.2.RELEASE</version>
       </dependency>
<!--      c3p0  连接池   -->
       <dependency>
           <groupId>com.mchange</groupId>
           <artifactId>c3p0</artifactId>
           <version>0.9.5.3</version>
       </dependency>
        <!-- druid  -->
       <dependency>
           <groupId>com.alibaba</groupId>
           <artifactId>druid</artifactId>
           <version>1.1.10</version>
       </dependency>
       <dependency>
           <groupId>junit</groupId>
           <artifactId>junit</artifactId>
           <version>4.12</version>
       </dependency>
   </dependencies>
</project>

4.  domain:

package com.zengjx.domain;

public class Account {
    private int id;
    private String name;
    private float money;

    public Account() {
    }

    public Account(int id, String name, float money) {
        this.id = id;
        this.name = name;
        this.money = money;
    }

    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 float getMoney() {
        return money;
    }

    public void setMoney(float money) {
        this.money = money;
    }

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", money='" + money + '\'' +
                '}';
    }
}

 5.   mysql  表：

6.   测试类：

  

//  查询单个
@Test
public   void   test2(){

    String   sql ="select   *  from   account  where  id=5 ";
    Map<String, Object> queryForMap = jdbcTemplate.queryForMap(sql);
    System.out.println(queryForMap);

}

   注意 查询jdbcTemplate.queryForMap  如果  返回的是多个结果 那么会报错：

//  查询单个
@Test
public   void   test2(){

    String   sql ="select   *  from   account  where  id=5 ";
    Map<String, Object> queryForMap = jdbcTemplate.queryForMap(sql);
    System.out.println(queryForMap);

}

  错误信息：

信息: {dataSource-1} inited

org.springframework.dao.IncorrectResultSizeDataAccessException: Incorrect result size: expected 1, actual 4

插入数据：

@Test
public    void   test_insert(){

 String   sql="INSERT  INTO account   VALUES(?,?,?);";

    int update = jdbcTemplate.update(sql,null,"ttt",2222f);
    System.out.println(update);

}

 

//更新数据
@Test
public   void   test_update(){

 String  sql =" UPDATE  account  SET   NAME  =? ,  money=?  WHERE   id =?";
    int update = jdbcTemplate.update(sql, "sasas", 1212f,7);
    System.out.println(update);
}
@Test
//删除数据
public   void    test_delete(){

String    sql =" DELETE  FROM   account   WHERE   id =?;";
    int update = jdbcTemplate.update(sql, 5);
    System.out.println(update);

}
//查找一个
@Test
public   void   test_queryOne(){
    String  sql =" SELECT    * FROM   account    WHERE   id=  ? ";
    Account account = jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<>(Account.class), 3);
    System.out.println(account);

}
//