code: protected void appendSQL(final String _tablePrefix,
                               final StringBuilder _cmd)
      {
          if (sections.size() > 0) {
              if (isStarted()) {
                  new SQLSelectPart(SQLPart.AND).appendSQL(_cmd);
                  new SQLSelectPart(SQLPart.SPACE).appendSQL(_cmd);
              } else {
                  new SQLSelectPart(SQLPart.WHERE).appendSQL(_cmd);
                  new SQLSelectPart(SQLPart.SPACE).appendSQL(_cmd);
              }
              addSectionsSQL(_tablePrefix, _cmd, sections);
          }
      }
docs: Append SQL.
  
  @param _tablePrefix the table prefix
  @param _cmd the cmd