搭建springboot+mybatis+druid+sqlite/mysql/oracle附带测试
1.版本
springboot2.1.6
jdk1.8
2.最简springboot环境
参考这个博客搭建
最新的初始化地址
3.pom（sqlite配置）
spring-boot-starter与spring-boot-starter-test
mybatis-spring-boot-starter
druid
sqlite-jdbc
org.springframework.boot spring-boot-starter org.springframework.boot spring-boot-starter-test test org.mybatis.spring.boot mybatis-spring-boot-starter 1.1.1 com.alibaba druid 1.1.9 org.xerial sqlite-jdbc 3.21.0.1
4.配置application.properties
注意1：sqlite不支持spring.datasource.filters的wall，请去掉
注意2：spring.datasource.type=com.alibaba.druid.pool.DruidDataSource以下的连接池的配置无法被druid加载，需要自己将配置设置到druid里，按照官网配置也不行。
官网配置
spring.datasource.driver-class-name=org.sqlite.JDBCspring.datasource.url=jdbc:sqlite:F:/epgis/program/gis-server/dataserver.pakspring.datasource.username=spring.datasource.password= spring.datasource.type=com.alibaba.druid.pool.DruidDataSource# 初始化大小，最小，最大spring.datasource.initialSize=1spring.datasource.minIdle=3spring.datasource.maxActive=20# 配置获取连接等待超时的时间spring.datasource.maxWait=60000# 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spring.datasource.timeBetweenEvictionRunsMillis=60000# 配置一个连接在池中最小生存的时间，单位是毫秒spring.datasource.minEvictableIdleTimeMillis=30000spring.datasource.validationQuery=select 'x'spring.datasource.testWhileIdle=truespring.datasource.testOnBorrow=falsespring.datasource.testOnReturn=false# 打开PSCache，并且指定每个连接上PSCache的大小spring.datasource.poolPreparedStatements=truespring.datasource.maxPoolPreparedStatementPerConnectionSize= 20# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙# sqlite不支持wall，使用sqlite请去掉spring.datasource.filters=stat,slf4j# 通过connectProperties属性来打开mergeSql功能；慢SQL记录spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000# 合并多个DruidDataSource的监控数据#useGlobalDataSourceStat=truemybatis.mapper-locations=classpath:mybatis/*.xml
5.将application.properties配置设置到druid里
如果不做第5步，数据库连接池也可以正常使用，但是它是使用的默认配置，非application.properties配置。
注意1：@configurationProperties的prefix里的设置，spring.datasource代表application.properties里的spring.datasource下的值，将自动调用DruidDataSource相同名称的set方法。
import javax.sql.DataSource;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.Primary;import com.alibaba.druid.pool.DruidDataSource;@Configurationpublic class DruidConfiguration { private static final Logger logger = LoggerFactory.getLogger(DruidConfiguration.class); @Bean @Primary @ConfigurationProperties(prefix = "spring.datasource") public DataSource dataSource1() { return new DruidDataSource(); } /*@Bean public FilterRegistrationBean filterRegistrationBean() { FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter()); filterRegistrationBean.addUrlPatterns("/*"); filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"); return filterRegistrationBean; }*/} 6.编写测试类，验证数据库连接池设置成功
package com.epgis.gisserver;import java.sql.Connection;import java.sql.SQLException;import javax.sql.DataSource;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.context.junit4.SpringRunner;import com.alibaba.druid.pool.DruidDataSource;@SpringBootTest@RunWith(SpringRunner.class)public class DataSouceTest { @Autowired DataSource dataSource1; @Test public void contextDuridLoads() throws SQLException { Connection con = dataSource1.getConnection(); System.err.println("**************"); System.err.println(dataSource1); DruidDataSource dss = (DruidDataSource)dataSource1; System.err.println(dss.getName()); System.err.println(dss.getValidationQuery()); System.err.println(dss.getTimeBetweenEvictionRunsMillis()); System.err.println(dss.getMinEvictableIdleTimeMillis()); // 数据源例如：HikariDataSource(springboot2.x默认)，DruidDataSource，dbcp2DataSource System.err.println(dataSource1.getClass().getName()); // 连接例如org.sqlite.SQLiteConnection System.err.println(con); System.err.println("**************"); con.close(); }} 检查1：dataSource1对象为DruidDataSource即为数据库连接池设置成功。
检查2：dss.getValidationQuery()的值为application.properties里spring.datasource.validationQuery的值"select 'x'"，即为其他数据库连接池配置成功。
7.编写及配置mybatis
很多人对这一步骤很熟悉了，在此简写。
7.1在开始类上加入@MapperScan("com.epgis.gisserver.**.dao")
7.2编写dao接口
7.4application.properties里加入xml文件扫描路径
路径：mybatis.mapper-locations=classpath:mybatis/*.xml
xml对应位置：
7.3编写xml文件
7.4编写测试方法
8.替换sqlite为oracle或mysql
8.1pom
org.xerial sqlite-jdbc 3.21.0.1
com.oracle ojdbc6 11.2.0.2
mysql mysql-connector-java 5.1.6
8.2application.properties文件
spring.datasource.driver-class-name=org.sqlite.JDBCspring.datasource.url=jdbc:sqlite:F:/epgis/program/gis-server/dataserver.pakspring.datasource.username=spring.datasource.password=
spring.datasource.driver-class-name=oracle.jdbc.OracleDriverspring.datasource.url = jdbc:oracle:thin:@127.0.0.1:1521:orclspring.datasource.username = testspring.datasource.password = test
spring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.url=jdbc:mysql://127.0.0.1:3306/mrbird?useUnicode=true&characterEncoding=utf8spring.datasource.username=testspring.datasource.password= test