SpringBoot2通过sql脚本文件生成表时不成功

SpringBoot2通过jdbc生成数据表应该参看 DataSourceInitializerInvoker 这个类了

 

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package org.springframework.boot.autoconfigure.jdbc; import javax.sql.DataSource; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.beans.factory.InitializingBean; import org.springframework.beans.factory.ObjectProvider; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationListener; /** * Bean to handle {@link DataSource} initialization by running {@literal schema-*.sql} on * {@link InitializingBean#afterPropertiesSet()} and {@literal data-*.sql} SQL scripts on * a {@link DataSourceSchemaCreatedEvent}. * * @author Stephane Nicoll * @see DataSourceAutoConfiguration */
class DataSourceInitializerInvoker implements ApplicationListener<DataSourceSchemaCreatedEvent>, InitializingBean { private static final Log logger = LogFactory .getLog(DataSourceInitializerInvoker.class); private final ObjectProvider<DataSource> dataSource; private final DataSourceProperties properties; private final ApplicationContext applicationContext; private DataSourceInitializer dataSourceInitializer; private boolean initialized; DataSourceInitializerInvoker(ObjectProvider<DataSource> dataSource, DataSourceProperties properties, ApplicationContext applicationContext) { this.dataSource = dataSource; this.properties = properties; this.applicationContext = applicationContext; } @Override public void afterPropertiesSet() { DataSourceInitializer initializer = getDataSourceInitializer(); if (initializer != null) { boolean schemaCreated = this.dataSourceInitializer.createSchema(); if (schemaCreated) { initialize(initializer); } } } private void initialize(DataSourceInitializer initializer) { try { this.applicationContext.publishEvent( new DataSourceSchemaCreatedEvent(initializer.getDataSource())); // The listener might not be registered yet, so don't rely on it.
            if (!this.initialized) { this.dataSourceInitializer.initSchema(); this.initialized = true; } } catch (IllegalStateException ex) { logger.warn("Could not send event to complete DataSource initialization ("
                    + ex.getMessage() + ")"); } } @Override public void onApplicationEvent(DataSourceSchemaCreatedEvent event) { // NOTE the event can happen more than once and // the event datasource is not used here
        DataSourceInitializer initializer = getDataSourceInitializer(); if (!this.initialized && initializer != null) { initializer.initSchema(); this.initialized = true; } } private DataSourceInitializer getDataSourceInitializer() { if (this.dataSourceInitializer == null) { DataSource ds = this.dataSource.getIfUnique(); if (ds != null) { this.dataSourceInitializer = new DataSourceInitializer(ds, this.properties, this.applicationContext); } } return this.dataSourceInitializer; } }

 

SpringBoot2通过sql脚本文件生成表时不成功，控制台没有输出相关创建数据表的提示

在这篇博客找到了解决方法：https://blog.csdn.net/weixin_38306434/article/details/83379059

解决方法：（1） 在application配置文件指定执行sql（静态资源）的地方加上initialization-mode:always即可

                  （2）如果你配置文件没有指定执行文件的名称而是使用默认的schema.sql或者schema-all.sql的话就在配置文件中加上spring.datasource.initialization-mode=always

原理的话可能是这篇博客里面讲的：https://www.cnblogs.com/snoopy-GJT/p/10825019.html

因为SpringBoot在启动时，只有检测到spring.datasource.initialization-mode=ALWAYS配置，然后再检测spring.datasource.schema，且配置的sql角本命令不为空，才会去执行schema和spring.datasource.data。因此需要在scheme.sql中随便写一句sql语句。

所以在application.properties/application.yml文件中必须配置spring.datasource.initialization-mode=ALWAYS