打印SQL记录子类：
org.apache.ibatis.logging.jdbc.PreparedStatementLogger extends BaseJdbcLogger implements InvocationHandler
org.apache.ibatis.logging.jdbc.ConnectionLogger extends BaseJdbcLogger implements InvocationHandler
org.apache.ibatis.logging.jdbc.ResultSetLogger extends BaseJdbcLogger implements InvocationHandler
org.apache.ibatis.logging.jdbc.StatementLogger extends BaseJdbcLogger implements InvocationHandler

打印SQL记录基类：
org.apache.ibatis.logging.jdbc.BaseJdbcLogger.java

其中debug：
  protected void debug(String text, boolean input) {
    if (statementLog.isDebugEnabled()) {
      statementLog.debug(prefix(input) + text);
    }
  }
调用的类有：
org.apache.ibatis.logging.jdbc.PreparedStatementLogger extends BaseJdbcLogger im