crystal reports multiple data sources

Way One:See blog https://www.cnblogs.com/AmbitiousMice/p/6027674.htmlThis way, you need to set the corresponding data source each time you call DAO.Way two:Configure the relevant DAO interface for the corresponding data source directly in the MyBatis configuration file (mapper.xml configuration file)1. Database configuration fileJdbc.driver=com.mysql.jdbc.driverjdbc.url=jdbc:mysql://duingold.mysql.rds.aliyu

Sometimes you need to connect to multiple databases, data sources are inconsistent and need to be configured.1, configuration XML. A data source, a template.......Multiple configurations can be repeated.The corresponding class is inherited Basicdatasource. and encryption ope

compensation mechanismFor those with high performance requirements, but not high consistency requirements of the system, often not demanding system real-time consistency, as long as the final consistency within an allowable time period, which makes the transaction compensation mechanism a feasible solution. The transaction compensation mechanism is initially proposed in the process of "long transaction", but it is very useful for the distributed system to ensure the consistency. In general, unl

Project needs to get data from other sites, because it is a temporary addition to the requirements, at the beginning of the project did not expect to need multiple data sources So Baidu a bit, found that only need to change the spring applicationcontext.xml files and write three tool classes can be a perfect implement

); returnuser; } @RequestMapping ("/add") Public voidSave (userentity user) {User2mapper.insert (user); } @RequestMapping (Value= "Update") Public voidUpdate (userentity user) {user2mapper.update (user); } @RequestMapping (Value= "/delete/{id}") Public voidDelete (@PathVariable ("id"Long ID) {user1mapper.delete (ID); }}The last source address is here: https://github.com/ityouknow/spring-boot-starterArticle Source: HTTP://MP.WEIXIN.QQ.COM/S/ESI8K3VOQKYL6PJ7ZBK6QWMore Learn

User1mapper; @Autowired Private User2mapper User2mapper; @RequestMapping ("/getusers") Public list List return users; } @RequestMapping ("/getuser") Public userentity GetUser (Long ID) { Userentity User=user2mapper.getone (ID); return user; } @RequestMapping ("/add") public void Save (userentity user) { User2mapper.insert (user); } @RequestMapping (value= "Update") public void Update (userentity user) { User2mapper.update (user); } @Re

") PublicEntitymanager Entitymanager (Entitymanagerfactorybuilder builder) {returnEntitymanagerfactorysqlite (builder). GetObject (). Createentitymanager (); } /*** Configure Transaction TransactionManager * *@paramBuilder *@returntransaction manager*/@Bean (Name= "Transactionmanagersqlite") PublicPlatformtransactionmanager transactionmanagersqlite (Entitymanagerfactorybuilder builder) {return NewJpatransactionmanager (Entitymanagerfactorysqlite (builder). GetObject ()); }}Then the Co

/utilhttp://www.springframework.org/schema/util/spring-util-4.0.xsd">class= "Com.alibaba.druid.pool.DruidDataSource"Destroy-method= "Close" > class= "Com.alibaba.druid.pool.DruidDataSource"Destroy-method= "Close" > class= "Com.jdd.ds.MultipleDataSource" > class= "Org.mybatis.spring.SqlSessionFactoryBean" > 8, to here and spring-related configuration is basically finished, in fact, after the configuration of MySQL master and slave replication, is the operation of the write library is synchronized

JBoss is a very powerful Java EE application Server, but this powerful feature also brings complexity. The author of this article, Marcus Zarra, analyzes how to configure multiple databases and data sources in JBoss. Configure a data source The default setup process for JBoss is a total of three configuration options

Transactionstatus object In the need of a consistency processing database, Try...catch. Normal process, Platformtransaction.commit (transactionstatus), when an exception occurs, call Platformtransaction.rollback (Transactionstatus) How the 2,spring Platformtransactionmanager is associated with the underlying data sourceIn the opening section, using a JDBC data source, the transaction is also a

, "AAA", and Jdbctemplate2.update ("INSERT into user (ID, Name,age) VALUES (?,?,?) ", 1," BBB "," Jdbctemplate2.update "(" INSERT into USER (id,name,age) VALUES (?,?,?) ", 2," BBB ", 31 ); Assert.assertequals ("1", Jdbctemplate1.queryforobject ("SELECT count (1) from user", String.class)); Assert.assertequals ("2", Jdbctemplate2.queryforobject ("SELECT count (1) from user", String.class));}}DatabaseDROP TABLE IF EXISTS ' user '; CREATE TABLE ' user ' ( ' id ' int (one) ' NOT null auto_increment