Mybatis打印SQL语句的几种常用方式

<configuration>
  <!-- 定义日志格式 -->
  <layout class="org.apache.log4j.PatternLayout">
    <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss.SSS} [%-5p] %c{1}:%L - %m%n"/>
  </layout>
  
  <!-- 定义输出级别 -->
  <root>
    <priority value="DEBUG"/>
    <appender-ref ref="STDOUT"/>
  </root>
</configuration>

public class SqlLogInterceptor implements Interceptor {
    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        Object[] args = invocation.getArgs();
 
        if (args != null && args.length > 1) {
            MappedStatement mappedStatement = (MappedStatement) args[0];
            Object parameter = args[1];
            BoundSql boundSql = mappedStatement.getBoundSql(parameter);
 
            String sql = boundSql.getSql();
            System.out.println("SQL语句：" + sql);
        }
 
        return invocation.proceed();
    }
}

<configuration>
  <!-- 将debug设置为true -->
  <settings>
    <setting name="debug" value="true"/>
  </settings>
</configuration>

<configuration>
  <cacheEnabled>true</cacheEnabled>
  <parameterMap id="ParamMap" type="map">
    <parameter property="id" jdbcType="INTEGER"/>
  </parameterMap>
  
  <!-- 设置loggingLevel为TRACE -->
  <settings>
    <setting name="logImpl" value="LOG4J"/>
    <setting name="jdbcTypeForNull" value="NULL"/>
    <setting name="cacheEnabled" value="true"/>
    <setting name="loggingLevel" value="TRACE"/>
  </settings>
</configuration>