Java游戏服务器开发之十二--数据库连接整合mybatis

应该比较让人关心的还有一个就是数据存储的问题了。
  下面将会介绍连接数据库的相关内容
  使用的是mysql数据库，框架中将使用mybatis
  这里介绍时假设各位都使用或者了解过mysql。

  

    1.在pom中添加相关包

 2.创建数据库和表

  3.创建映射实体类entity与数据库操作对象Dao
  4.创建映射文件mapper.xml
  5.在spring中配置mybatis
 6.调用Dao进行测试
  

 1.在pom中添加相关包  

    <!-- mybatis orm包 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.3.0</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.2.3</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis.caches</groupId>
      <artifactId>mybatis-ehcache</artifactId>
      <version>1.0.3</version>
    </dependency>
    <dependency>
      <groupId>org.hibernate.javax.persistence</groupId>
      <artifactId>hibernate-jpa-2.1-api</artifactId>
      <version>1.0.0.Final</version>
    </dependency>
    <!-- mysql数据库驱动包 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.38</version>
    </dependency>
    <!-- 数据库连接池druid包 -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.0.16</version>
    </dependency>

  2.创建数据库和表
创建jg_server，选择utf8的编码
创建user表，里面就是个字段，id/name/account/password
插入一条测试数据

具体的sql语句如下

        

/*
SQLyog 企业版 - MySQL GUI v8.14 
MySQL - 5.6.26-log : Database - jg_server
*********************************************************************
*/


/*!40101 SET NAMES utf8 */;

/*!40101 SET SQL_MODE=''*/;

/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
CREATE DATABASE /*!32312 IF NOT EXISTS*/`jg_server` /*!40100 DEFAULT CHARACTER SET utf8 */;

USE `jg_server`;

/*Table structure for table `user` */

DROP TABLE IF EXISTS `user`;

CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(128) DEFAULT '-',
  `account` varchar(32) DEFAULT '-',
  `password` varchar(32) DEFAULT '-',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8 CHECKSUM=1 ROW_FORMAT=DYNAMIC;

/*Data for the table `user` */

insert  into `user`(`id`,`name`,`account`,`password`) values (1,'2','3','4');

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

 3.创建映射实体类entity与数据库操作对象Dao
与user表对应，类名使用User，别名也使用这个

UserDao里面就写一个方法，获取全部的表数据

User

        

/*
 * Copyright (C), 2015-2018
 * FileName: User
 * Author:   zhao
 * Date:     2018/6/28 14:31
 * Description: 用户表
 * History:
 * <author>          <time>          <version>          <desc>
 * 作者姓名           修改时间           版本号              描述
 */
package com.lizhaoblog.server.biz.entity;

import org.apache.ibatis.type.Alias;

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

/**
 * 〈一句话功能简述〉<br>
 * 〈用户表对应的实体类〉
 *
 * @author zhao
 * @date 2018/6/28 14:31
 * @since 1.0.0
 */
@Table(name = "user")
@Alias("User")
public class User {
  @Id
  @Column(name = "id")
  private Integer id;
  @Column(name = "name")
  private String name;
  @Column(name = "account")
  private String account;
  @Column(name = "password")
  private String password;

  public Integer getId() {
    return id;
  }

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

  public String getName() {
    return name;
  }

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

  public String getAccount() {
    return account;
  }

  public void setAccount(String account) {
    this.account = account;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }
}

        UserDao

/*
 * Copyright (C), 2015-2018
 * FileName: UserDao
 * Author:   zhao
 * Date:     2018/6/28 14:37
 * Description: User表数据处理
 * History:
 * <author>          <time>          <version>          <desc>
 * 作者姓名           修改时间           版本号              描述
 */
package com.lizhaoblog.server.biz.dao.mysql;

import com.lizhaoblog.server.biz.entity.User;

import org.apache.ibatis.annotations.CacheNamespaceRef;
import org.apache.ibatis.annotations.Options;
import org.apache.ibatis.annotations.ResultMap;
import org.apache.ibatis.annotations.Select;

import java.util.List;

/**
 * 〈一句话功能简述〉<br>
 * 〈User表数据处理 〉
 *
 * @author zhao
 * @date 2018/6/28 14:37
 * @since 1.0.0
 */
@CacheNamespaceRef(UserDao.class)
public interface UserDao {
  @Select("SELECT * FROM user")
  @ResultMap("resultMap")
  @Options(useCache = false)
  List<User> listUser();
}

  5.创建映射文件mapper.xml
我们直接使用 类名.xml的方式，然后写一个resultMap
resources--mybatis--jpa中添加User.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.lizhaoblog.server.biz.dao.mysql.UserDao">
  <cache type="org.mybatis.caches.ehcache.LoggingEhcache"/>
  <resultMap type="com.lizhaoblog.server.biz.entity.User" id="resultMap">
    <result property="id" column="id"/>
    <result property="name" column="name"/>
    <result property="account" column="account"/>
    <result property="password" column="password"/>
  </resultMap>
</mapper>

  4.spring中配置mybatis
在resources--mybatis--jg中添加一个mybatis-config.xml
数据库连接池的配置，在resources--properties添加db-config-dev.properties

在ApplicationContext.xml的同级目录添加一个ApplicationContext-mysql.xml

        修改ApplicationContext.xml

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD SQL Map Config 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
  <settings>
    <!--<setting name="cacheEnabled" value="true"/><!– 全局映射器启用缓存 –>-->
    <setting name="defaultExecutorType" value="REUSE"/>
  </settings>
</configuration>

db-config-dev.properties

mysql.url:jdbc:mysql://localhost:3306/jg_server?useUnicode=true&characterEncoding=UTF-8
mysql.driverClassName:com.mysql.jdbc.Driver
#mysql.username:root
#mysql.password:admin
mysql.username:adminjg
mysql.password:admin666


filters:stat

maxActive:20
initialSize:1
maxWait:60000
minIdle:10
maxIdle:15

timeBetweenEvictionRunsMillis:60000
minEvictableIdleTimeMillis:300000

validationQuery:SELECT 'x'
testWhileIdle:true
testOnBorrow:false
testOnReturn:false

maxOpenPreparedStatements:20
removeAbandoned:true
removeAbandonedTimeout:1800
logAbandoned:true

ApplicationContext-mysql.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
						http://www.springframework.org/schema/beans/spring-beans-4.2.xsd">

    <bean name="mysqlTransactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="mysqlDs"></property>
        <qualifier value="mysql"/>
    </bean>

    <!-- 阿里 druid数据库连接池 -->
    <bean id="mysqlDs" class="com.alibaba.druid.pool.DruidDataSource"
          destroy-method="close">
        <!-- 数据库基本信息配置 -->
        <property name="url" value="${mysql.url}"/>
        <property name="username" value="${mysql.username}"/>
        <property name="password" value="${mysql.password}"/>
        <property name="driverClassName" value="${mysql.driverClassName}"/>
        <property name="filters" value="${filters}"/>
        <!-- 最大并发连接数 -->
        <property name="maxActive" value="${maxActive}"/>
        <!-- 初始化连接数量 -->
        <property name="initialSize" value="${initialSize}"/>
        <!-- 配置获取连接等待超时的时间 -->
        <property name="maxWait" value="${maxWait}"/>
        <!-- 最小空闲连接数 -->
        <property name="minIdle" value="${minIdle}"/>
        <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
        <property name="timeBetweenEvictionRunsMillis" value="${timeBetweenEvictionRunsMillis}"/>
        <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="${minEvictableIdleTimeMillis}"/>
        <property name="validationQuery" value="${validationQuery}"/>
        <property name="testWhileIdle" value="${testWhileIdle}"/>
        <property name="testOnBorrow" value="${testOnBorrow}"/>
        <property name="testOnReturn" value="${testOnReturn}"/>
        <property name="maxOpenPreparedStatements" value="${maxOpenPreparedStatements}"/>
        <!-- 打开removeAbandoned功能 -->
        <property name="removeAbandoned" value="${removeAbandoned}"/>
        <!-- 1800秒，也就是30分钟 -->
        <property name="removeAbandonedTimeout" value="${removeAbandonedTimeout}"/>
        <!-- 关闭abanded连接时输出错误日志 -->
        <property name="logAbandoned" value="${logAbandoned}"/>
    </bean>

    <!-- 配置mybatis -->
    <bean id="mysqlSqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="mysqlDs"/>
        <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"></property>
        <property name="typeAliasesPackage" value="com.lizhaoblog"></property>
        <!--<property name="typeAliasesSuperType" value="com.lizhaoblog.server.biz.Entity"></property>-->
        <!-- mapper扫描 -->
        <property name="mapperLocations" value="classpath:mybatis/*/*.xml"></property>
    </bean>

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.lizhaoblog.server.biz.dao.mysql"></property>
        <property name="sqlSessionFactoryBeanName" value="mysqlSqlSessionFactory"></property>
    </bean>

</beans>

        修改ApplicationContext.xml

<import resource="ApplicationContext-mysql.xml"/>
  <!--指向的配置文件-->
  <bean id="cfgProps" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
    <property name="locations">
      <list>
        <value>classpath:properties/server-config-dev.properties</value>
        <value>classpath:properties/db-config-dev.properties</value>
      </list>
    </property>
  </bean>

  6.调用Dao进行测试
在handler里面注入UserDao，然后调用list方法
@Autowired
private UserDao userDao;
 

    List<User> myAll = userDao.listUser();

  上面的代码在码云上 https://gitee.com/lizhaoandroid/JgServer
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