一起學習Spring boot 2.1.X | 第五篇：Mybatis Druid 資料庫(注解版)

運行展示

正題

Spring boot ：2.１.5RELEASE ；資料庫（Mysql、Oracle）；Mybatis；阿里云的連接池 : Druid ；

步驟

１．POM依賴

<!-- MyBatis -->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.3.2</version>
</dependency>

<!-- MySQL -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

<!-- Oracle -->
<!--<dependency>
	<groupId>com.oracle</groupId>
	<artifactId>ojdbc14</artifactId>
	<version>10.2.0.4.0</version>
/dependency>-->

<!-- Druid -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.16</version>
</dependency>

２．application.properties

#Mybatis+MySQL+Druid
#Mysql時區例外URL后添加serverTimezone=GMT%2B8/連接池:typr/初始化連接:initialSize/最大空閑數:maxActive/最小空閑數:minIdle/獲取連接等待時間:maxWait/最小等待時間:minEvictableIdleTimeMillis/關閉后不自動提交:defaultAutoCommit
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&serverTimezone=GMT%2B8&characterEncoding=utf-8&allowMultiQueries=true&useSSL=false
#spring.datasource.url=jdbc:oracle:thin:@127.0.0.1:1521:test
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver

# 初始化大小，最小，最大
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
# 配置獲取連接等待超時的時間
spring.datasource.maxWait=60000
# 配置間隔多久才進行一次檢測，檢測需要關閉的空閑連接，單位是毫秒
spring.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一個連接在池中最小生存的時間，單位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打開PSCache，并且指定每個連接上PSCache的大小
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置監控統計攔截的filters，去掉后監控界面sql無法統計，'wall'用于防火墻
spring.datasource.filters=stat,wall,log4j
# 通過connectProperties屬性來打開mergeSql功能；慢SQL記錄
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多個DruidDataSource的監控資料
#spring.datasource.useGlobalDataSourceStat=true

spring.datasource.defaultAutoCommit=false

3.其他檔案生成

User.java

public class User {

    public Integer uid;
    public String uname;
    public String upassword;

    public Integer getUid() {
        return uid;
    }

    public void setUid(Integer uid) {
        this.uid = uid;
    }

    public String getUanme() {
        return uname;
    }

    public void setUanme(String uanme) {
        this.uname = uanme;
    }

    public String getUpassword() {
        return upassword;
    }

    public void setUpassword(String upassword) {
        this.upassword = upassword;
    }

    @Override
    public String toString() {
        return "User{" +
                "uid=" + uid +
                ", uname='" + uname + '\'' +
                ", upassword='" + upassword + '\'' +
                '}';
    }
}

UserDao.java

import com.spring.boot.bean.User;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import java.util.List;

@Mapper
public interface UserDao {

    @Select("select * from user")
    public List<User> AllUser();

    @Update("<script> " + "update user" +
            "<set>"+  "<if test='uname!=null'>uname=#{uname},</if>"+
            "<if test='upassword!=null'>upassword=#{upassword},</if>"+
            "</set>"+ "where uid=#{uid}"+
            " </script> ")
    public int Update(User user);

}

UserService.java

import com.spring.boot.bean.User;
import java.util.List;

public interface UserService {

    public List<User> AllUser();

    public int Update(User user);

}

UserImpl.java
主要是注解問題Service可以命名，主要還是看自己的日常使用

import com.spring.boot.bean.User;
import com.spring.boot.dao.UserDao;
import com.spring.boot.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserImpl implements UserService {

    @Autowired
    private UserDao userDao;

    @Override
    public List<User> AllUser() {

        return userDao.AllUser();
    }

    @Override
    public int Update(User user) {
        return userDao.Update(user);
    }
}

UserController.java

import com.spring.boot.bean.User;
import com.spring.boot.service.impl.UserImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletRequest;

@RestController
public class UserController {

    @Autowired
    private  HttpServletRequest request;

    @Autowired
    private UserImpl userimpl;

     @RequestMapping("/api/login")
    public String Login(User user) {

        HttpSession session = request.getSession();

        //存入Session
        //session.setAttribute("user", user);
        //單位為秒，設定為-1時不再失效
        //session.setMaxInactiveInterval(60 * 60 * 24 * 30);
        //注銷登陸
        //request.getSession().removeAttribute("user");

        return userimpl.UserAll(user).toString();
    }
}

注：userDao報紅解決方法

注：啟動類加入注解@MapperScan("路徑)
小編這是Java web專案，@Controller注解是界面、@RestController是寫介面