transactions after sharding; • Support RC isolation level; • Rollback transaction according to undo log; • Support recovery committing transaction automatically after the service is down. Unsupported probes and written to the time series database for display by third‐party applications. Logging The log can be easily expanded through the agent to provide more information for analyzing the system running retryIntervalMilliseconds: 500 timeToLiveSeconds: 60 overwrite: false Related References • Installation and Usage of ZooKeeper Registry Center • Please refer to Builtin Persist Repository List for

Supported • Support cross‐database transactions after sharding; • Rollback transaction according to undo log; • Support recovery committing transaction automatically after the service is down. Unsupported probes and written to the time series database for display by third‐party applications. Logging The log can be easily expanded through the agent to provide more information for analyzing the system running server-lists: localhost:2181 retryIntervalMilliseconds: 500 timeToLiveSeconds: 60 Related References • Installation and Usage of ZooKeeper Registry Center • Please refer to Builtin Persist Repository List for

statistical indicators are collected through probes for display by third‐party applications. Logging The log can be easily expanded through the agent to provide more information for analyzing the system running tifactId> ${shardingsphere.version} Related References • Installation and Usage of ZooKeeper Registry Center • Please refer to Builtin Persist Repository List for ", "governance-sharding-db", "localhost:2181", new Properties())); } Related References • Installation and Usage of ZooKeeper Registry Center • Please refer to Builtin Persist Repository List for

statistical indicators are collected through probes for display by third‐party applications. Logging The log can be easily expanded through the agent to provide more information for analyzing the system running tifactId> ${shardingsphere.version} Related References • Installation and Usage of ZooKeeper Registry Center • Please refer to Builtin Persist Repository List for ", "governance-sharding-db", "localhost:2181", new Properties())); } Related References • Installation and Usage of ZooKeeper Registry Center • Please refer to Builtin Persist Repository List for

databases in the same log . . . . . . . . . . . . . . . . . . . . . . 215 To distinguish databases and users in the same log . . . . . . . . . . . . . . . . . 216 To split into different log files . . . . the item to be sorted which has its own order, merger ordering only has the time complexity of O(mn(log m)), and the number of shard m is generally small enough to be considered as O(n), with a very low transactions after sharding; • Support RC isolation level; • Rollback transaction according to undo log; • Support recovery committing transaction automatically after the service is down. Unsupported

the item to be sorted which has its own order, merger ordering only has the time complexity of O(mn(log m)), and the number of shard m is generally small enough to be considered as O(n), with a very low transactions after sharding; • Support RC isolation level; • Rollback transaction according to undo log; • Support recovery committing transaction automatically after the service is down. Unsupported Launch plugin bin/start.sh After normal startup, you can view the startup log of the plugin in the shardingsphere proxy log, and you can view the data at the configured address. 4.10. Observability

development work. This chapter explains how to set up a working environment for MyBatis. MyBatis Installation Carry out the following simple steps to install MyBatis on your machine − Download the latest

atguigu.ibatis.bean.User" alias="_User"/> 4.3. 可以在 src 下加入 log4j 的配置文件,打印日志信息 1. 添加 jar: log4j-1.2.16.jar 2.1. log4j.properties(方式一) “玩转”Java 系列 ————————— com 下载区】 log4j.properties， log4j.rootLogger=DEBUG, Console #Console log4j.appender.Console=org.apache.log4j.ConsoleAppender log4j.appender.Console.layout=org.apache.log4j.PatternLayout log4j.appender ConversionPattern=%d [%t] %-5p [%c] - %m%n log4j.logger.java.sql.ResultSet=INFO log4j.logger.org.apache=INFO log4j.logger.java.sql.Connection=DEBUG log4j.logger.java.sql.Statement=DEBUG log4j.logger.java.sql.PreparedStatement=DEBUG

6.3.4 Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Log in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Login with RequestMethod.POST) public void execute(String source, @RequestHeader String shardingContext) { log.info("execute from source : {}, shardingContext : {}", source, shardingContext); } } 6.1. Usage handler strat- egy name Description • B u i l t - i n * • D e f a u l t * E xtra con fig Log Strategy Log error and do not interrupt job Y e s Y e s Throw Strategy Throw system ex‐ ception and inter‐

指定 MyBatis 增加 到日志名称的前 缀。 Any String Not set logImpl 指定 MyBatis 所用 日志的具体实现， 未指定时将自动查 SLF4J | LOG4J | LOG4J2 | JDK_LOGGING | Not set Save web pages as PDF manually or automatically with PDFmyURL 未指定时将自动查 项目信息 项目信息 项目报表 项目报表 Logging Mybatis内置的日志工厂提供日志功能，具体的日志实现有以下几种工具： SLF4J Apache Commons Logging Log4j 2 Log4j JDK logging 具体选择哪个日志实现工具由MyBatis的内置日志工厂确定。它会使用最先找到的（按上文列举的顺序查找）。 如果一个都未找到，日 志功能就会被禁用。 不少应用 现。记住这点非常重要。这将意味着，在诸如 WebSphere的环境中——WebSphere提供了Commons Logging的私有实现，你的 Log4J配置将被忽略。 这种做法不免让人悲催，MyBatis怎么能忽略你的配置呢？事实上，因Commons Logging已经存 在了，按照 优先级顺序，Log4J自然就被忽略了！不过，如果你的应用部署在一个包含Commons Logging的环境， 而你又想用其他的日志框 架，你可以根据需要调用如下的某一方法：