springboot中mysql的连接

在config包中建一个类mybatisconfig放

package com.hgkj.post.config;

import javax.sql.DataSource;

import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.data.transaction.ChainedTransactionManager;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.annotation.TransactionManagementConfigurer;

import com.jolbox.bonecp.BoneCPDataSource;

@Configuration
@EnableTransactionManagement
@PropertySource(value = { "classpath:jdbc.properties" })
public class MyBatisConfig implements TransactionManagementConfigurer{ 
	    
	    @Value("${mysql.jdbc.url}")
	    private String mysqlJdbcUrl;

	    @Value("${mysql.jdbc.driverClassName}")
	    private String mysqlJdbcDriverClassName;

	    @Value("${mysql.jdbc.username}")
	    private String mysqlJdbcUsername;

	    @Value("${mysql.jdbc.password}")
	    private String mysqlJdbcPassword;
    
    
    @Bean(destroyMethod = "close")
    @Primary
    public DataSource mysqlDataSource() throws Exception {

        BoneCPDataSource boneCPDataSource = new BoneCPDataSource();
        // 数据库驱动
        boneCPDataSource.setDriverClass(mysqlJdbcDriverClassName);
        // 相应驱动的jdbcUrl
        boneCPDataSource.setJdbcUrl(mysqlJdbcUrl);
        // 数据库的用户名
        boneCPDataSource.setUsername(mysqlJdbcUsername);
        // 数据库的密码
        boneCPDataSource.setPassword(mysqlJdbcPassword);
        // 检查数据库连接池中空闲连接的间隔时间，单位是分，默认值：240，如果要取消则设置为0
        boneCPDataSource.setIdleConnectionTestPeriodInMinutes(60);
        // 连接池中未使用的链接最大存活时间，单位是分，默认值：60，如果要永远存活设置为0
        boneCPDataSource.setIdleMaxAgeInMinutes(30);
        // 每个分区最大的连接数
        boneCPDataSource.setMaxConnectionsPerPartition(10);
        // 每个分区最小的连接数
        boneCPDataSource.setMinConnectionsPerPartition(2);
        boneCPDataSource.setIdleConnectionTestPeriodInSeconds(30);
        boneCPDataSource.setConnectionTestStatement(" SELECt 1 FROM DUAL ");
        return boneCPDataSource;
    }

    
    @Bean(name="mysqlSqlSessionFactoryBean")
    @Primary
    public SqlSessionFactoryBean mysqlSqlSessionFactoryBean() throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(mysqlDataSource());       
        ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:mybatis/mappers/*.xml"));
        return sqlSessionFactoryBean;
    }

      
    public PlatformTransactionManager annotationDrivenTransactionManager() {  
        DataSourceTransactionManager mysql_dtm = null;
		try {
			mysql_dtm = new DataSourceTransactionManager(mysqlDataSource());
		} catch (Exception e) {
			e.printStackTrace();
		}  
  
        ChainedTransactionManager ctm = new ChainedTransactionManager(mysql_dtm);  
        return ctm;  
    }  
}

里面的@value{值}是从jdbc.properties中取的

jdbc.properties:

# 告诉java去com.mysql.jdbc路径下将Driver类加载到jvm内存中com.mysql.jdbc.Driver/com.mysql.cj.jdbc.Driver
#驱动
mysql.jdbc.driverClassName=com.mysql.jdbc.Driver
mysql.jdbc.url=jdbc:mysql://localhost:3306/你的数据库名?useUnicode=true&serverTimezone=Asia/Shanghai&useSSL=false
mysql.jdbc.username=数据库账户
mysql.jdbc.password=数据库密码

也是在config文件夹中新建类MyBatisMapperScannerConfig来扫描接口并自动装配

package com.hgkj.post.config;

import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@AutoConfigureAfter(MyBatisConfig.class)
public class MyBatisMapperScannerConfig {

	@Bean
	public MapperScannerConfigurer mysqlMapperScannerConfigurer() {
		MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
		mapperScannerConfigurer.setbasePackage("com.***.***.dao");
		mapperScannerConfigurer.setSqlSessionFactoryBeanName("mysqlSqlSessionFactoryBean");
		mapperScannerConfigurer.setAnnotationClass(MysqlRepository.class);
		return mapperScannerConfigurer;
	}

}

也是在config文件夹中新建类MysqlRepository要在接口上调用

public @interface MysqlRepository {

}

如果只是仅连接，前面两个就够了，如果要写mapper就加上后面两个截图，然后在每个接口上写一个@MysqlRepository，就可以直接在mapper写语句了