使用if標簽查詢語句，where后面直接跟if怎么處理

有時候我們會直接在where后面跟if標簽的情況

解決方案如下：

WHERE 1=1
<if test="request.orderName != null and request.orderName != ''" >
    AND o.order_name  = #{request.orderName}
</if>
<if test="request.contractName != null and request.request.contractName != ''" >
    AND c.contract_name = #{request.contractName}
</if>
<if test="request.sheetWorkflowApplicant != null and request.sheetWorkflowApplicant != ''" >
    AND swf.created_by = #{request.sheetWorkflowApplicant}
</if>
<if  test="request.auditState != null and request.auditState != '' or request.auditState==0 ">
    AND swf.audit_state #{request.auditState}
</if>
在where后面加1=1即可