查询返回 - ＆gt; ORA-19011：字符串缓冲区太小

Question

我在下面运行此查询，并且oracle返回以下消息：查询返回 - ＆gt; ORA-19011：字符串缓冲区太小 当我取消注释最后一行时，它可以工作。我认为这就是为什么这会导致很少的结果。怎么解决这个？

 select substr(xmlagg(xmlelement (e, str||',')).extract ('//text()'),1,(Length(Trim(xmlagg (xmlelement (e, str||',')).extract ('//text()')))-2)) motivos
     FROM (
           select to_char(lo_valor) str
             from editor_layout el,
                  editor_versao_documento ev,
                  editor_documento ed,
                  editor_layout_campo elc,
                  editor_campo ec,
                  editor_registro er,
                  editor_registro_campo erc,
                  pw_editor_clinico pec,
                  pw_documento_clinico pdc
            where pec.cd_editor_registro   = er.cd_registro
              and pdc.cd_documento_clinico = pec.cd_documento_clinico
              and ed.cd_documento          = ev.cd_documento
              and el.cd_versao_documento   = ev.cd_versao_documento
              and el.cd_layout             = elc.cd_layout
              and elc.cd_campo             = ec.cd_campo
              and elc.cd_campo             = erc.cd_campo
              and er.cd_registro           = erc.cd_registro
              and er.cd_layout             = el.cd_layout
              and ec.ds_identificador = 'nut_orientacoes_entregues_1'
              AND To_Char(lo_valor) IS NOT null
              --and Trunc(pdc.dh_documento) BETWEEN Trunc(SYSDATE-5) AND Trunc(SYSDATE)
          )

Answer 1

xmlagg(xmlelement ...)来电的内容会返回clob，您尝试将其填入varchar2，因为您拨打了substr。如果clob太大，那将失败。

取消注释最后一行时失败的原因是在该范围之外，存在内容太长的行。