spring boot访问mysql数据库

其他 2018-09-16 06:03:02 阅读次数: 0

本文是在win7上面利用IntelliJ IDEA 2018搭建spring boot工程来访问mysql数据库。

1 在win7上面安装mysql数据库

从mysql官网https://dev.mysql.com/downloads/windows/installer/8.0.html下载8.0安装板程序mysql-installer-community-8.0.12.0.msi，安装过程参考文章https://blog.csdn.net/xiangxiezhuren/article/details/79622606。

2 创建mysql数据库test，并创建表和数据

从开始菜单启动mysql：

查看所有数据库：

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| db_example         |
| information_schema |
| mysql              |
| performance_schema |
| sys                |              |
+--------------------+
5 rows in set (0.00 sec)

创建名为test的数据库：

mysql> create database test;

使用数据库test:

mysql> use test;
Database changed

创建名为employee的表，这个表有id,name,gender,age四列：

mysql>  CREATE TABLE employee(
    ->  id VARCHAR(100) NOT NULL,
    ->  name VARCHAR(100) NOT NULL,
    ->  gender VARCHAR(10) NOT NULL,
    ->  age INT NOT NULL,
    ->  PRIMARY KEY (id))ENGINE=InnoDB DEFAULT CHARSET=ut
Query OK, 0 rows affected, 1 warning (0.24 sec)

mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| employee       |
+----------------+
1 row in set (0.05 sec)

mysql> describe employee;
+--------+--------------+------+-----+---------+-------+
| Field  | Type         | Null | Key | Default | Extra |
+--------+--------------+------+-----+---------+-------+
| id     | varchar(100) | NO   | PRI | NULL    |       |
| name   | varchar(100) | NO   |     | NULL    |       |
| gender | varchar(10)  | NO   |     | NULL    |       |
| age    | int(11)      | NO   |     | NULL    |       |
+--------+--------------+------+-----+---------+-------+
4 rows in set (0.02 sec)

向employee表中插入俩行数据：

mysql> insert into employee values(
    ->  "120","Lucy","female",20
    ->  );
Query OK, 1 row affected (0.12 sec)

mysql> insert into employee values(
    ->  "121","Heaton","male",21
    ->  );
Query OK, 1 row affected (0.14 sec)

mysql> select * from employee;
+-----+--------+--------+-----+
| id  | name   | gender | age |
+-----+--------+--------+-----+
| 120 | Lucy   | female |  20 |
| 121 | Heaton | male   |  21 |
+-----+--------+--------+-----+
2 rows in set (0.00 sec)

3 使用IntelliJ IDEA新建spring boot项目

新建项目时选择Spring Initializr，然后一路next，即可新建一个spring boot工程。

4 配置pom.xml

添加mysql相关的依赖，主要有web库、jpa库和mysql-connector-java库。

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

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

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

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
	</dependencies>

5 配置application.properties

application.properties：

# 服务器访问端口
server.port=8080
# 数据库基本配置
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

spring.jpa.database=MYSQL
# 显示后台处理的SQL语句
spring.jpa.show-sql=true
# 自动检查实体和数据库表是否一致，如果不一致则会进行更新数据库表
spring.jpa.hibernate.ddl-auto=update

6 编写实体层Employee.java

新建类Employee：

package com.example.demo;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="employee")
public class Employee {
    private static final long serialVersionUID = 1L;
    @Id
    @Column(name="id")
    private String id;
    @Column(name="name")
    private String name;
    @Column(name="gender")
    private String gender;
    @Column(name="age")
    private int age;

    public static long getSerialVersionUID() {
        return serialVersionUID;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

@Entity代表这是一个实体类，@Table(name=”employee”)用来对应MySQL中的employee数据库，@Id用来表达主键，@Column(name=”id”)表明一个id属性。 

7 编写dao层

dao层主要用来实现对数据库的增、删、查、改。新建接口EmployeeRepository并继承JpaRepository

package com.example.demo;

import org.springframework.data.jpa.repository.JpaRepository;

public interface  EmployeeRepository extends JpaRepository<Employee,String> {
}

8  编写controller层

controller层主要用来与前端交互的。新建类EmployeeController：

package com.example.demo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.List;

@RestController
@RequestMapping("/employee")
public class EmployeeController {
    @RequestMapping("queryAll")
    @ResponseBody
    public List<Employee> queryAll(){
        List<Employee> list = new ArrayList<Employee>();
        list = employeeRepository.findAll();
        return list;
    }
    @Autowired
    private EmployeeRepository employeeRepository;
}

9 运行并验证

在IDEA中运行DemoApplication工程，控制台打印：

"C:\Program Files\Java\jdk1.8.0_171\bin\java" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=64748 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Djava.rmi.server.hostname=localhost -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2017.3.4\lib\idea_rt.jar=64749:C:\Program Files\JetBrains\IntelliJ IDEA 2017.3.4\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_171\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\rt.jar;D:\demo\target\classes;C:\Users\lzj\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.0.4.RELEASE\spring-boot-starter-web-2.0.4.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\boot\spring-boot-starter\2.0.4.RELEASE\spring-boot-starter-2.0.4.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\boot\spring-boot\2.0.4.RELEASE\spring-boot-2.0.4.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.0.4.RELEASE\spring-boot-autoconfigure-2.0.4.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.0.4.RELEASE\spring-boot-starter-logging-2.0.4.RELEASE.jar;C:\Users\lzj\.m2\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;C:\Users\lzj\.m2\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;C:\Users\lzj\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.10.0\log4j-to-slf4j-2.10.0.jar;C:\Users\lzj\.m2\repository\org\apache\logging\log4j\log4j-api\2.10.0\log4j-api-2.10.0.jar;C:\Users\lzj\.m2\repository\org\slf4j\jul-to-slf4j\1.7.25\jul-to-slf4j-1.7.25.jar;C:\Users\lzj\.m2\repository\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;C:\Users\lzj\.m2\repository\org\yaml\snakeyaml\1.19\snakeyaml-1.19.jar;C:\Users\lzj\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.0.4.RELEASE\spring-boot-starter-json-2.0.4.RELEASE.jar;C:\Users\lzj\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.9.6\jackson-databind-2.9.6.jar;C:\Users\lzj\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;C:\Users\lzj\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.9.6\jackson-core-2.9.6.jar;C:\Users\lzj\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.6\jackson-datatype-jdk8-2.9.6.jar;C:\Users\lzj\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.6\jackson-datatype-jsr310-2.9.6.jar;C:\Users\lzj\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.6\jackson-module-parameter-names-2.9.6.jar;C:\Users\lzj\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.0.4.RELEASE\spring-boot-starter-tomcat-2.0.4.RELEASE.jar;C:\Users\lzj\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\8.5.32\tomcat-embed-core-8.5.32.jar;C:\Users\lzj\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\8.5.32\tomcat-embed-el-8.5.32.jar;C:\Users\lzj\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\8.5.32\tomcat-embed-websocket-8.5.32.jar;C:\Users\lzj\.m2\repository\org\hibernate\validator\hibernate-validator\6.0.11.Final\hibernate-validator-6.0.11.Final.jar;C:\Users\lzj\.m2\repository\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;C:\Users\lzj\.m2\repository\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;C:\Users\lzj\.m2\repository\com\fasterxml\classmate\1.3.4\classmate-1.3.4.jar;C:\Users\lzj\.m2\repository\org\springframework\spring-web\5.0.8.RELEASE\spring-web-5.0.8.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\spring-beans\5.0.8.RELEASE\spring-beans-5.0.8.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\spring-webmvc\5.0.8.RELEASE\spring-webmvc-5.0.8.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\spring-aop\5.0.8.RELEASE\spring-aop-5.0.8.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\spring-context\5.0.8.RELEASE\spring-context-5.0.8.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\spring-expression\5.0.8.RELEASE\spring-expression-5.0.8.RELEASE.jar;C:\Users\lzj\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\lzj\.m2\repository\org\springframework\spring-core\5.0.8.RELEASE\spring-core-5.0.8.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\spring-jcl\5.0.8.RELEASE\spring-jcl-5.0.8.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\boot\spring-boot-starter-data-jpa\2.0.4.RELEASE\spring-boot-starter-data-jpa-2.0.4.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\boot\spring-boot-starter-aop\2.0.4.RELEASE\spring-boot-starter-aop-2.0.4.RELEASE.jar;C:\Users\lzj\.m2\repository\org\aspectj\aspectjweaver\1.8.13\aspectjweaver-1.8.13.jar;C:\Users\lzj\.m2\repository\org\springframework\boot\spring-boot-starter-jdbc\2.0.4.RELEASE\spring-boot-starter-jdbc-2.0.4.RELEASE.jar;C:\Users\lzj\.m2\repository\com\zaxxer\HikariCP\2.7.9\HikariCP-2.7.9.jar;C:\Users\lzj\.m2\repository\org\springframework\spring-jdbc\5.0.8.RELEASE\spring-jdbc-5.0.8.RELEASE.jar;C:\Users\lzj\.m2\repository\org\hibernate\hibernate-core\5.2.17.Final\hibernate-core-5.2.17.Final.jar;C:\Users\lzj\.m2\repository\org\hibernate\javax\persistence\hibernate-jpa-2.1-api\1.0.2.Final\hibernate-jpa-2.1-api-1.0.2.Final.jar;C:\Users\lzj\.m2\repository\org\javassist\javassist\3.22.0-GA\javassist-3.22.0-GA.jar;C:\Users\lzj\.m2\repository\antlr\antlr\2.7.7\antlr-2.7.7.jar;C:\Users\lzj\.m2\repository\org\jboss\jandex\2.0.3.Final\jandex-2.0.3.Final.jar;C:\Users\lzj\.m2\repository\dom4j\dom4j\1.6.1\dom4j-1.6.1.jar;C:\Users\lzj\.m2\repository\org\hibernate\common\hibernate-commons-annotations\5.0.1.Final\hibernate-commons-annotations-5.0.1.Final.jar;C:\Users\lzj\.m2\repository\javax\transaction\javax.transaction-api\1.2\javax.transaction-api-1.2.jar;C:\Users\lzj\.m2\repository\org\springframework\data\spring-data-jpa\2.0.9.RELEASE\spring-data-jpa-2.0.9.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\data\spring-data-commons\2.0.9.RELEASE\spring-data-commons-2.0.9.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\spring-orm\5.0.8.RELEASE\spring-orm-5.0.8.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\spring-tx\5.0.8.RELEASE\spring-tx-5.0.8.RELEASE.jar;C:\Users\lzj\.m2\repository\org\springframework\spring-aspects\5.0.8.RELEASE\spring-aspects-5.0.8.RELEASE.jar;C:\Users\lzj\.m2\repository\mysql\mysql-connector-java\5.1.46\mysql-connector-java-5.1.46.jar" com.example.demo.DemoApplication

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.0.4.RELEASE)

2018-09-05 17:53:23.141  INFO 7124 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication on lzj-PC with PID 7124 (D:\demo\target\classes started by lzj in D:\demo)
2018-09-05 17:53:23.165  INFO 7124 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default
2018-09-05 17:53:23.232  INFO 7124 --- [           main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@16e7dcfd: startup date [Wed Sep 05 17:53:23 CST 2018]; root of context hierarchy
2018-09-05 17:53:24.347  INFO 7124 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$dce24d23] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-09-05 17:53:24.686  INFO 7124 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2018-09-05 17:53:24.704  INFO 7124 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2018-09-05 17:53:24.704  INFO 7124 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.32
2018-09-05 17:53:24.707  INFO 7124 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener   : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jdk1.8.0_171\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Java\jdk1.8.0_171\bin;C:\Program Files\Java\jdk1.8.0_171\jre\bin;C:\Program Files\Git\cmd;C:\Go\bin;C:\Program Files\MATLAB\R2018a\runtime\win64;C:\Program Files\MATLAB\R2018a\bin;C:\Program Files\Microsoft VS Code\bin;C:\Program Files\TortoiseSVN\bin;;C:\Program Files\Microsoft VS Code\bin;F:\GoPro\bin;D:\Software\netcat-1.11;C:\Program Files\mingw-w64\x86_64-7.3.0-posix-seh-rt_v5-rev0\mingw64\bin\;C:\Python27;.]
2018-09-05 17:53:24.799  INFO 7124 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext

通过浏览器访问http://localhost:8080/employee/queryAll，浏览器中显示：

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转载自blog.csdn.net/liuzhijun301/article/details/82427226
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