求PB大神帮忙实现多条件查询情况string ls_1,ls_2,ls_3,ls_condition, ls_sql_new,ls_sql,ls_4 ls_1=trim (sle_1.text)ls_2=trim (sle_2.text) ls_3=trim (sle_4.text)ls_4=trim (ddlb_1.text)if ls_1="" and ls_2=""and ls_3="" and ls_4="" then Mes
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