正常应用和数据库交互的过程是这样的, 其实我们也可以把部分应用逻辑放到DB端去执行,来提升效率 User-defined Function Stored Procedures Triggers Change Notification User-defined Types Views UDF 用户定义的function,往往用于select中,不会修改数据本身 UDF可以用SQL实现,也可以用外部语言,右边是PG的例子 Stored Procedure 存储过程,可以理解成在数据库上执行一个脚本…

问题 如下: 2017-07-16 08:50:57.436  INFO 13524 --- [           main] c.p.p.web.PointshopWebApplication        : Starting PointshopWebApplication on MSI with PID 13524 (D:\javaProject\com.ppdai.pointshop\pointshop-web\target\classes started by yangliweng…

学习Spring Boot 过程中遇到了下列这个问题 Description: Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.//无法配置数据库,没有指定url属性,并且无法配置embedded datasourceReason: Failed to determine a suitable driver class…

springboot+jpa使用自定义配置文件连接数据库报错:Cannot determine embedded database driver class for database type NONE 原因:没有配置数据源dataSource,配置文件加载进来了的. 解决办法:在配置类中配置数据源 package com.springboot1.util; import org.apache.tomcat.jdbc.pool.DataSource;import org.springframew…

Caused by: org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Cannot determine embedded database driver class for database type NONE. If you want an embedded database please put a supported one on the cl…

ref:https://www.journaldev.com/13830/spring-boot-cannot-determine-embedded-database-driver-class-for-database-type-none https://blog.csdn.net/hengyunabc/article/details/78762097 写在前面 这个demo来说明怎么一步步排查一个常见的spring boot AutoConfiguration的错误. https://gith…

用这种数据库配置就是死活连不上数据库 提示:Cannot determine embedded database driver class for database type NONE 解决方式: 启动成功: 问题在于.Spring boot自启动并没有内置小德(durid) 必须手动配置…

我在springboot项目里面引入了数据库的配置: <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId&g…

最近在学习使用spring boot.使用maven创建好工程,只引用需要用到的spring boot相关的jar包,除此之外没有任何的配置. 写了一个最简单的例子,如下所示: package com.torlight; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.EnableAutoConfiguration; import org.spring…

CS 265: Research Topics in Database Systems Announcements Quiz 3 will be posted. Good luck! Quiz 2 has been posted. Good luck! Here is the History of a Paper that was mentioned in the Project handout. Please complete this Paper Survey for the first t…

解决参考文章:https://blog.csdn.net/hengyunabc/article/details/78762097 spring boot启动报错如下: Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled. -- :: --- [ main] o.s.b.d.LoggingFailureAnal…

原因: Cannot determine embedded database driver class for database type NONE 这是因为spring boot默认会加载org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration类,DataSourceAutoConfiguration类使用了@Configuration注解向spring注入了dataSource bean.因为工程中没有关于…

由于我不需要数据库,启动springboot报错: Cannot determine embedded database driver class for database type NONE If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you ma…

package cn.zb.test; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.EnableAutoConfiguration; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.autocon…

问题 如下: 2017-07-16 08:50:57.436  INFO 13524 --- [           main] c.p.p.web.PointshopWebApplication        : Starting PointshopWebApplication on MSI with PID 13524 (D:\javaProject\com.ppdai.pointshop\pointshop-web\target\classes started by yangliweng…

在spring boot项目中,我们在pom.xml文件中添加了mysql和mybatis的依赖,我们常常遇到下面这样的问题: Description: Cannot determine embedded database driver class for database type NONE Action: If you want an embedded database please put a supported one on the classpath. If you have data…

这个坑把java进程干掉就可以了,因为占用了 Description: Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.//无法配置数据库,没有指定url属性,并且无法配置embedded datasourceReason: Failed to determine a suitable driver class//原因…

Springboot 之 启动报错-数据库 springboot项目在启动时,报如下错误: Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled. 2019-09-09 20:47:28.395 ERROR 16240 --- [ main] o.s.b.d.LoggingFailureAnalysisRepo…

Description: Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured. Reason: Failed to determine a suitable driver class Action: Consider the following: If you want an embedded database (H2,…

部署boot项目时报Cannot datermine embedded database driver class for database type NONE数据库链接什么的也都没有问题,经过百度 因为spring boot只要你在pom中引入了mybatis-spring-boot-starter 他就会默认需要加载数据库相关的配置 你要是没有在配置文件中配置数据相关信息,它会加载默认的配置(不存在的) 然后就报错了, 所以你要是要用数据库相关的东西 你就完善配置不用数据库相关的东西 就不要…

The database table has a physical existence in the database. A view is a virtual table, that is one that does not actually exist. View is made up of a query on one or many tables in a database. In database theory, a view is the result set of a stored…

Skip Headers Oracle® Database Patch 19121551 - Database Patch Set Update 11.2.0.4.4 (Includes CPUOct2014)   Released: October 14, 2014 This document is accurate at the time of release. For any changes and additional information regarding PSU 11.2.0.4…

<Windows Azure Platform 系列文章目录>  Azure SQL Database (19) Stretch Database 概览      Azure SQL Database (20) 使用SQL Server 2016 Upgrade Advisor      Azure SQL Database (21) 将整张表都迁移到Azure Stretch Database里      Azure SQL Database (22) 迁移部分数据到Azure Stretc…

使用duplicate target database ... from active database复制数据库 source db:ora11auxiliary db:dupdb 1.修改监听文件,静态注册监听 SID_LIST_ORA11 = (SID_LIST = (SID_DESC = (GLOBAL_DBNAME = ora11) (ORACLE_HOME = /u11/app/oracle/product//dbhome_1) (SID_NAME =ora11) ) (SID_DE…

primary database db_name=zwc, db_unique_name=zwc standby database db_name=zwc, db_unique_name=standby on primary database [oracle@vmdb12c ~]$ sqlplus sys/oracle@zwc as sysdba SQL*Plus: Release 12.1.0.1.0 Production on Thu Sep 26 16:12:10 2013 Copyrig…

DELETE DATABASE and DELETE USER statements delete all data tables, views, and macros from a database or user. The database or user remains in the Teradata Database as a named object and retains the available space. None of that space is any longer in…

问题描述: arcgis server10.1  arcgis sde10出现下面问题 Cannot connect to  database because the database client software failed to load. Be sure the database client software is installed and configured correctly. 由于数据库客户端软件无法加载,无法连接到数据库.请确保数据库客户端软件已安装和配置正确. 找原因:…

数据库数据丢失的典型场景如下, 数据commit后,还没有来得及flush到disk,这时候crash就会丢失数据 当然这只是fail的一种情况,DataBase Recovery要讨论的是,在各种fail的情况下,如何保证, 1. 已经commit的transaction的数据不丢失:2. 没有部分提交的情况,all or nothing 为了达成这个目的,需要在txn执行的过程中做一些actions保留当时状态,然后在failover后,再执行一系列actions去recover这些状态 F…

2PL是悲观锁,Pessimistic,这章讲乐观锁,Optimistic,单机的,非分布式的 Timestamp Ordering,以时间为序,这个是非常自然的想法,按每个transaction的时间来排谁先执行 这里会有几个问题,Timestamp是什么,由谁来打,什么时候打上Timestamp 首先每个T需要有一个unique的timestamp,这个在单机很容易实现:其次,Timestamp必须是单调递增的最后,不同的schema会选择在不同的时间给txn打上timestamp,可能是t…

并发控制是数据库理论里面最难的课题之一 并发控制首先了解一下事务,transaction 定义如下, 其实transaction关键是,要满足ACID属性, 左边的正式的定义,由于的intuitive的理解其中可能Consistency比较难理解一下,其他都比较直观,对于单机数据库而言consistency其实不是个显著的问题,但对于分布式数据库这就是个主要问题 那么问题就是如何设计让Transaction满足ACID? 一种简单的方法就是,Strawman System 串行执行保障consi…