mybatis-config.xml is configured to support a variety of database, using the configuration described herein, the class to configure Spring Boot.
1. Configure application.yml
# mybatis配置
mybatis:
check-config-location: false
type-aliases-package: ${base.package}.model
configuration:
map-underscore-to-camel-case: true
# 二级缓存的总开关
cache-enabled: false
mapper-locations: classpath:mapping/*.xml
2. Add configuration class data source
/**
* 数据源配置
* @author simon
* @date 2019-02-18
*/
@Configuration
public class DataSourceConfig {
@Value("${mybatis.mapper-locations}")
private String mapperLocations;
@Primary
@Bean
@ConfigurationProperties("spring.datasource.druid")
public DataSource dataSource(){
return DruidDataSourceBuilder.create().build();
}
@Bean
public JdbcTemplate jdbcTemplate(){
return new JdbcTemplate(dataSource());
}
@Bean
public DatabaseIdProvider databaseIdProvider(){
DatabaseIdProvider databaseIdProvider = new VendorDatabaseIdProvider();
Properties p = new Properties();
p.setProperty("Oracle", "oracle");
p.setProperty("MySQL", "mysql");
p.setProperty("PostgreSQL", "postgresql");
p.setProperty("DB2", "db2");
p.setProperty("SQL Server", "sqlserver");
databaseIdProvider.setProperties(p);
return databaseIdProvider;
}
@Bean
public SqlSessionFactoryBean sqlSessionFactoryBean() throws Exception {
SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
factoryBean.setDataSource(dataSource());
factoryBean.setDatabaseIdProvider(databaseIdProvider());
factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations));
return factoryBean;
}
}
3. In the mapper.xml
method 1
<select id="findAuthorityByUrl" resultType="java.lang.String" databaseId="mysql">
SELECT
group_concat( tsma.authority ) as authority
FROM
t_side_menu tsm
LEFT JOIN t_side_menu_authority tsma ON tsm.id = tsma.side_menu_id
</select>
<select id="findAuthorityByUrl" resultType="java.lang.String" databaseId="postgresql">
SELECT
string_agg( tsma.authority, ',') as authority
FROM
t_side_menu tsm
LEFT JOIN t_side_menu_authority tsma ON tsm.id = tsma.side_menu_id
</select>
Method 2
<select id="selectByPids" parameterType="String" resultMap="SuperResultMap">
SELECT
tsm.*,
<if test="_databaseId == 'mysql'">
group_concat( tsma.authority ) as authority
</if>
<if test="_databaseId == 'postgresql'">
string_agg( tsma.authority, ',') as authority
</if>
FROM
t_side_menu tsm
LEFT JOIN t_side_menu_authority tsma ON tsm.id = tsma.side_menu_id
WHERE pid IN (#{pids})
GROUP BY
tsm.id
</select>
Digression
If you are interested, please give oauthserer project a star. oauthserver based Spring Boot Oauth2 is a complete stand-alone micro Oauth2 Server service. The purpose of the project is only necessary to create a data table, modify the database connection information, you can get a micro Oauth2 Server service.
Original Address: https: //segmentfault.com/a/1190000018193491 utm_source = tag-newest?