Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

问题:

  Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

 

 

问题分析及解决方案


问题原因: Mybatis没有找到合适的加载类,其实是大部分spring - datasource - url没有加载成功,分析原因如下所示.

  1. DataSourceAutoConfiguration会自动加载.

  2. 没有配置spring - datasource - url 属性.

  3. spring - datasource - url 配置的地址格式有问题.

  4. 配置 spring - datasource - url的文件没有加载.

方案一 (解决原因1)

排除此类的autoconfig。启动以后就可以正常运行。

@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})
方案二 (解决原因2)

在application.properties/或者application.yml文件中没有添加数据库配置信息.

spring:
  # 配置数据源
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/my_shiro?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&useSSL=false
    username: root
    password: root
    type: com.alibaba.druid.pool.DruidDataSource
方案三 (解决原因3)

在spring xml配置文件中引用了数据库地址 所以需要对:等进行转义处理.但是在application.properties/或者application.yml文件并不需要转义,错误和正确方法写在下面了.

//错误示例
spring.datasource.url = jdbc:mysql\:localhost:3306/my_shiro?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&useSSL=false
//正确示例
spring.datasource.url = jdbc:mysql://localhost:3306/my_shiro?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&useSSL=false
方案四 (解决原因4)

配置了主从数据库,却没有写读取druid的配置,找不到url,还是写成方案二吧,如果实在要用,自己搜教程

spring:
    datasource:
        type: com.alibaba.druid.pool.DruidDataSource
        driverClassName: com.mysql.cj.jdbc.Driver
        druid:
            # 主库数据源
            master:
                url: jdbc:mysql://localhost:3306/my_shiro?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
                username: root
                password: root
            # 从库数据源
            slave:
                # 从数据源开关/默认关闭
                enabled: false
                url: 
                username: 
                password: 

 

方案五 (解决原因5)

yml或者properties文件没有被扫描到,需要在pom文件中<build></build>添加如下.来保证文件都能正常被扫描到并且加载成功.

<!-- 如果不添加此节点mybatis的mapper.xml文件都会被漏掉。 -->
<resources>
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.yml</include>
            <include>**/*.properties</include>
            <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
    </resource>
    <resource>
        <directory>src/main/resources</directory>
        <includes>
            <include>**/*.yml</include>
            <include>**/*.properties</include>
            <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
    </resource>
</resources>

 

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

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