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First, the use of the log in step Mybatis
At first Mybatis program as an example, using Mybatis in log.
Step 1: Create log4j.properties file
Normally this file is placed in the same level and src config folder.
Step Two: Write configuration information
# Global logging configuration
log4j.rootLogger=info, stdout
# MyBatis logging configuration...
log4j.logger.org.mybatis.example.BlogMapper=TRACE
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
About log4j.rootLogger property:
- When using the on-line real project: log4j.rootLogger = info
- Test phase: log4j.rootLogger = debug
Second, log analysis
After execution of the first program Mybatis, print out the log is as follows:
DEBUG [main] - Logging initialized using 'class org.apache.ibatis.logging.slf4j.Slf4jImpl' adapter.
DEBUG [main] - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] - PooledDataSource forcefully closed/removed all connections.
DEBUG [main] - Opening JDBC Connection
DEBUG [main] - Created connection 1969003420.
DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@755c9b9c]
DEBUG [main] - ==> Preparing: SELECT id,username as name,sex,address,birthday FROM user WHERE id = ?;
DEBUG [main] - ==> Parameters: 1(Integer)
DEBUG [main] - <== Total: 1
1,冬雨,女,北京,2020-02-06
DEBUG [main] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@755c9b9c]
DEBUG [main] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@755c9b9c]
DEBUG [main] - Returned connection 1969003420 to pool.
Log information | Log Analysis |
---|---|
Opening JDBC Connection | Open the JDBC link |
Created connection 1969003420. | Create a connection |
Setting autocommit to false on JDBC Connection | Automatic submission failed transaction |
Preparing: SELECT id,username as name,sex,address,birthday FROM user WHERE id = ?; | sql statement |