本篇文章为你整理了学习笔记——定义切面优先级 ；Spring中的JdbcTemplate；JdbcTemplate的常用API（）的详细内容，包含有 学习笔记——定义切面优先级 ；Spring中的JdbcTemplate；JdbcTemplate的常用API，希望能帮助你了解 学习笔记——定义切面优先级 ；Spring中的JdbcTemplate；JdbcTemplate的常用API。
1、语法：@Order(value=index)
①index是int类型，默认值是int可存储的最大值
②数值越小，优先级越高
二、Spring中的JdbcTemplate
1、JdbcTemplate简介
（1）Spring提供的JdbcTemplate是一个小型持久化层框架，简称Jdbc代码
Mybatis是一个半自动化的ORM持久化层框架
2、JdbcTemplate基本使用
（1）导入Jar包
dependencies
!-- https://mvnrepository.com/artifact/org.springframework/spring-context --
dependency
groupId org.springframework /groupId
artifactId spring-context /artifactId
version 5.3.10 /version
/dependency
!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc --
dependency
groupId org.springframework /groupId
artifactId spring-jdbc /artifactId
version 5.3.10 /version
/dependency
!-- https://mvnrepository.com/artifact/org.springframework/spring-orm --
dependency
groupId org.springframework /groupId
artifactId spring-orm /artifactId
version 5.3.10 /version
/dependency
!-- https://mvnrepository.com/artifact/com.alibaba/druid --
dependency
groupId com.alibaba /groupId
artifactId druid /artifactId
version 1.1.10 /version
/dependency
!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --
dependency
groupId mysql /groupId
artifactId mysql-connector-java /artifactId
version 8.0.26 /version
/dependency
!-- https://mvnrepository.com/artifact/junit/junit --
dependency
groupId junit /groupId
artifactId junit /artifactId
version 4.12 /version
scope test /scope
/dependency
/dependencies
（2）编写配置文件
db.properties:设置连接数据库属性
applicationContext.xml（spring配置文件）
加载外部属性文件、装配数据源（DataSources）、装配JdbcTemplate
?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: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/context https://www.springframework.org/schema/context/spring-context.xsd"
!-- 加载外部属性文件--
context:property-placeholder location="classpath:db.properties" /context:property-placeholder
!-- 装配数据源（DataSources）--
bean id="dataSource"
property name="driverClassName" value="${db.driverClassName}" /property
property name="url" value="${db.url}" /property
property name="username" value="${db.username}" /property
property name="password" value="${db.password}" /property
/bean
!-- 装配JdbcTemplate--
bean id="jdbcTemplate"
property name="dataSource" ref="dataSource" /property
/bean
/beans
（3）使用核心类库
三、JdbcTemplate的常用API
1、jdbcTemplate.update(String sql,Object... args)：通用的增删改查方法
//创建容器对象
ApplicationContext context =
new ClassPathXmlApplicationContext("applicationContext_jdbcTemplate.xml");
//获取JdbcTemplate对象
JdbcTemplate jdbcTemplate = context.getBean("jdbcTemplate", JdbcTemplate.class);
// String sql = "insert into tbl_dept(dept_name) values(?)";
// jdbcTemplate.update(sql,"采购部门");
// String sql = "delete from tbl_dept where dept_id = ?";
// jdbcTemplate.update(sql,4);
String sql = "update tbl_dept set dept_name=? where dept_id=?";
jdbcTemplate.update(sql,"人事2部",3);
2、jdbcTemplate.batchUpdate(String,List Object[ ] )：通用批处理增删改查方法
//批量增
String sql = "insert into tbl_employee(last_name,email,salary,dept_id) values(?,?,?,?)";
List Object[] empList = new ArrayList ();
empList.add(new Object[]{"zs","zs@163.com",100.0,1});
empList.add(new Object[]{"lisi","lisi@163.com",100.0,2});
empList.add(new Object[]{"wangwu","wangwu@163.com",100.0,2});
empList.add(new Object[]{"zhaoliu","zhaoliu@163.com",100.0,1});
empList.add(new Object[]{"qianqi","qianqi@163.com",100.0,1});
jdbcTemplate.batchUpdate(sql,empList);
3、jdbcTemplate.queryForObject(String sql,Class clazz,Object... args)：查询单个数值
String sql = "select count(1) from tbl_employee";
Integer count = jdbcTemplate.queryForObject(sql, Integer.class);
System.out.println("员工数量为：" + count);
4、jdbcTemplate.queryForObject(String sql,RowMapper T rm,Object... args):查询单个对象
//查询单个对象
String sql = "select id,last_name,email,salary,dept_id from tbl_employee where id=?";
// 创建RowMapper
RowMapper Employee rowMapper = new BeanPropertyRowMapper (Employee.class);
Employee employee = jdbcTemplate.queryForObject(sql, rowMapper, 1);
System.out.println("employee = " + employee);
5、jdbcTemplate.query(String sql,RowMapper T rm,Object... args):查询多个对象
//查询多个对象
String sql = "select id,last_name,email,salary,dept_id from tbl_employee";
//创建RowMapper T
RowMapper Employee rowMapper = new BeanPropertyRowMapper (Employee.class);
//测试
List Employee query = jdbcTemplate.query(sql, rowMapper);
for (Employee employee : query) {
System.out.println("employee = " + employee);
}
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