通过Spring Boot使用MySQL JDBC驱动程序

在本文中，我将向您展示如何将MySQL数据库与Spring Boot应用程序连接。

本文使用的工具包括：

Spring Boot 1.5.6版本
MySQL 5.7.X
马文
Java 8
Spring Data JPA

1 –项目结构

项目结构是典型的Maven结构。

2 –项目依赖性

请注意，父母需要申报。如果您使用的是Spring Tool Suite，则可以单击新的“ Spring Starter Project”，它将为您填充。

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.michaelcgood</groupId><artifactId>mysql-jdbc</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>mysql-jdbc-driver</name><description>mysql jdbc driver example</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.6.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version></properties><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><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

3 –模型

对于此示例应用程序，我们的应用程序将“跟踪”网络中系统的最新安全审核。由于此示例应用程序旨在简化，因此模型的字段将最少。

请注意，Java库中有一个内置的System类。因此，我将避免使用System.java作为实际应用程序的类名。

System.java

package com.michaelcgood.model;import java.util.Date;import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;@Entity
public class System {private String name;private Date lastaudit;public Date getLastaudit() {return lastaudit;}public void setLastaudit(Date lastaudit) {this.lastaudit = lastaudit;}@Id@GeneratedValue(strategy = GenerationType.AUTO)@Column(name="id")private long id;public long getId() {return id;}public void setId(long id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String toString(){return id+" | " + name+ " | "+ lastaudit;}}

4 –储存库

这是一个简单的CrudRepository，它是允许我们执行CRUD（创建，读取，更新，删除）操作的接口。

SystemRepository.java

package com.michaelcgood.dao;import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import com.michaelcgood.model.System;@Repository
public interface SystemRepository extends CrudRepository<System,Long> {}

5 –数据库初始化

Spring Boot默认情况下启用dataSource初始化程序，并从类路径的根目录加载SQL脚本（schema.sql和data.sql）。

5.1

在这里，我们创建应用程序将用于表架构的SQL文件。

模式.sql

DROP TABLE IF EXISTS system;
CREATE TABLE system (id INT NOT NULL AUTO_INCREMENT,name VARCHAR(100) NOT NULL,lastaudit DATE NOT NULL,PRIMARY KEY (id));

5.2

我们将示例值插入数据库。

资料库

INSERT INTO system(name,lastaudit)VALUES('Windows Server 2012 R2 ','2017-08-11');
INSERT INTO system(name,lastaudit)VALUES('RHEL 7','2017-07-21');
INSERT INTO system(name,lastaudit)VALUES('Solaris 11','2017-08-13');

5.3

此XML文件用于配置我们的日志记录。

logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration><statusListener class="ch.qos.logback.core.status.NopStatusListener" /><appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"><layout class="ch.qos.logback.classic.PatternLayout"><Pattern>%d{yyyy-MM-dd HH:mm:ss} %-5level %logger{36} - %msg%n</Pattern></layout></appender><logger name="org.springframework.jdbc" level="error" additivity="false"><appender-ref ref="STDOUT"/></logger><logger name="com.michaelcgood" level="error" additivity="false"><appender-ref ref="STDOUT"/></logger><root level="error"><appender-ref ref="STDOUT"/></root></configuration>

6 –配置

我们配置数据源和JPA设置。

application.properties

#==== connect to mysql ======#
spring.jpa.hibernate.ddl-auto=update
spring.datasource.url=jdbc:mysql://localhost:3306/mysqltutorial?useSSL=false
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

7 – @SpringBootApplication

实现CommandLineRunner是为了执行此示例的命令行参数。

package com.michaelcgood.app;import javax.sql.DataSource;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;import com.michaelcgood.dao.SystemRepository;@SpringBootApplication
@EnableJpaRepositories("com.michaelcgood.dao")
@EntityScan("com.michaelcgood.model")
public class MysqlJdbcDriverApplication implements CommandLineRunner {@AutowiredDataSource dataSource;@AutowiredSystemRepository systemRepository;public static void main(String[] args) {SpringApplication.run(MysqlJdbcDriverApplication.class, args);}@Overridepublic void run(String... args) throws Exception {System.out.println("Our DataSource is = " + dataSource);Iterable<com.michaelcgood.model.System> systemlist = systemRepository.findAll();for(com.michaelcgood.model.System systemmodel:systemlist){System.out.println("Here is a system: " + systemmodel.toString());}}}

8 –演示

.   ____          _            __ _ _/\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \\\/  ___)| |_)| | | | | || (_| |  ) ) ) )'  |____| .__|_| |_|_| |_\__, | / / / /=========|_|==============|___/=/_/_/_/
[32m :: Spring Boot :: [39m      [2m (v1.5.6.RELEASE)[0;39mOur DataSource is = org.apache.tomcat.jdbc.pool.DataSource@40f70521{ConnectionPool[defaultAutoCommit=null; defaultReadOnly=null; defaultTransactionIsolation=-1; defaultCatalog=null; driverClassName=com.mysql.jdbc.Driver; maxActive=100; maxIdle=100; minIdle=10; initialSize=10; maxWait=30000; testOnBorrow=true; testOnReturn=false; timeBetweenEvictionRunsMillis=5000; numTestsPerEvictionRun=0; minEvictableIdleTimeMillis=60000; testWhileIdle=false; testOnConnect=false; password=********; url=jdbc:mysql://localhost:3306/mysqltutorial?useSSL=false; username=root; validationQuery=SELECT 1; validationQueryTimeout=-1; validatorClassName=null; validationInterval=3000; accessToUnderlyingConnectionAllowed=true; removeAbandoned=false; removeAbandonedTimeout=60; logAbandoned=false; connectionProperties=null; initSQL=null; jdbcInterceptors=null; jmxEnabled=true; fairQueue=true; useEquals=true; abandonWhenPercentageFull=0; maxAge=0; useLock=false; dataSource=null; dataSourceJNDI=null; suspectTimeout=0; alternateUsernameAllowed=false; commitOnReturn=false; rollbackOnReturn=false; useDisposableConnectionFacade=true; logValidationErrors=false; propagateInterruptState=false; ignoreExceptionOnPreLoad=false; useStatementFacade=true; }
Here is a system: 1 | Windows Server 2012 R2  | 2017-08-11 00:00:00.0
Here is a system: 2 | RHEL 7 | 2017-07-21 00:00:00.0
Here is a system: 3 | Solaris 11 | 2017-08-13 00:00:00.0

完整的代码在 Github上