springboot（4）Druid作为项目数据源（添加监控）

参考博客：恒宇少年：https://www.jianshu.com/p/e84e2709f383

Druid简介

　　Druid是一个关系型数据库连接池，它是阿里巴巴的一个开源项目。Druid支持所有JDBC兼容数据库，包括了Oracle、MySQL、PostgreSQL、SQL Server、H2等。
　　Druid在监控、可扩展性、稳定性和性能方面具有明显的优势。

　　通过Druid提供的监控功能，可以实时观察数据库连接池和SQL查询的工作情况。使用Druid连接池在一定程度上可以提高数据访问效率。

 

本文知识点：（本文访问数据库用的是Spring Data JPA）

　　整合Druid完成MySQL数据访问，以及配置Druid监控模块整合。

 

一、项目搭建，项目目录及数据库显示

对应数据库的bean类

package com.dyh.bean;

//import org.hibernate.annotations.Table;

import javax.persistence.*;
import java.io.Serializable;

@Entity
@Table(name = "student")
public class Student implements Serializable{
    @Id
    @GeneratedValue
    @Column(name = "id")
    private Long id;

    @Column(name = "stu_id")
    private String sId;

    @Column(name = "stu_name")
    private String name;

    @Column(name = "stu_sex")
    private String sex;

    public Long getId() {
        return id;
    }

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

    public String getsId() {
        return sId;
    }

    public void setsId(String sId) {
        this.sId = sId;
    }

    public String getName() {
        return name;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", sId='" + sId + '\'' +
                ", name='" + name + '\'' +
                ", sex='" + sex + '\'' +
                '}';
    }
}

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二、导入依赖

访问mvnrepository.com/artifact/com.alibaba/druid，选择依赖版本

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.dyh</groupId>
    <artifactId>lesson_three</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>lesson_three</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

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

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

        <dependency>
            <!--ysql-connector-java的支持-->
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <!--如果使用的是内部Tomcat，那么应该注释掉<scope></scope>-->
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <!--<scope>provided</scope>-->
        </dependency>

        <!--Druid-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.29</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

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