java----jdbcTemplate

JDBCtemplate使用

插入

String sql="insert into user (name,deptid) values (?,?)";
int count= jdbcTemplate.update(sql, new Object[]{"caoyc",3});

批量插入

String sql="insert into user (name,deptid) values (?,?)";

List<Object[]> batchArgs=new ArrayList<Object[]>();
batchArgs.add(new Object[]{"caoyc",6});
batchArgs.add(new Object[]{"zhh",8});
batchArgs.add(new Object[]{"cjx",8});

jdbcTemplate.batchUpdate(sql, batchArgs);

删除

String sql="update user set name=?,deptid=? where id=?";
jdbcTemplate.update(sql,new Object[]{"zhh",5,51});

//或者
String sql="delete from user where id=?";
jdbcTemplate.update(sql,51);

读

String sql="select id,name,deptid from user where id=?";
RowMapper<User> rowMapper=new BeanPropertyRowMapper<User>(User.class);
User user= jdbcTemplate.queryForObject(sql, rowMapper,52);

读取多个对象

String sql="select id,name,deptid from user";

RowMapper<User> rowMapper=new BeanPropertyRowMapper<User>(User.class);
List<User> users= jdbcTemplate.query(sql, rowMapper);
for (User user : users) {
    System.out.println(user);
}

获取某个记录某列或者count、avg、sum等函数返回唯一值

String sql="select count(*) from user";
int count= jdbcTemplate.queryForObject(sql, Integer.class);

　　

Spring+Spring MVC+JDBCtemplate

依赖

spring-jdbc

db.properties

jdbc.user=root
jdbc.password=123456
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql:///test

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/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
        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-4.3.xsd">

<context:component-scan base-package="com.proc"></context:component-scan>
<context:property-placeholder location="classpath:db.properties"/>
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="user" value="${jdbc.user}"></property>
    <property name="password" value="${jdbc.password}"></property>
    <property name="driverClass" value="${jdbc.driverClass}"></property>
    <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
</bean>

<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    <property name="dataSource" ref="dataSource"></property>
</bean>
</beans>

使用

@Repository
public class UserDao {
 
     @Autowired
     private JdbcTemplate jdbcTemplate;
     
     public User get(int id){
         String sql="select id,name,deptid from user where id=?";
         RowMapper<User> rowMapper=new BeanPropertyRowMapper<User>(User.class);
         return jdbcTemplate.queryForObject(sql, rowMapper,id);
     }
 }

SpringBoot+JDBCtemplate

依赖

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- 引入jdbc支持 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <!-- 连接MySQL数据库 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- 生成api文档 -->

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.2.2</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.2.2</version>
        </dependency>
    </dependencies>

application.properties

spring.datasource.url=jdbc:mysql://localhost:3306/test_db?serverTimezone=GMT%2B8&useSSL=false
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

使用

@Repository
public class UserDao {
 
     @Autowired
     private JdbcTemplate jdbcTemplate;
     
     public User get(int id){
         String sql="select id,name,deptid from user where id=?";
         RowMapper<User> rowMapper=new BeanPropertyRowMapper<User>(User.class);
         return jdbcTemplate.queryForObject(sql, rowMapper,id);
     }
 }