{"id":7883,"date":"2024-11-14T14:57:01","date_gmt":"2024-11-14T06:57:01","guid":{"rendered":"https:\/\/fwq.ai\/blog\/7883\/"},"modified":"2024-11-14T14:57:01","modified_gmt":"2024-11-14T06:57:01","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-if-test-%e8%af%ad%e5%8f%a5%e5%9c%a8-sql-%e4%b8%ad%e5%88%a4%e6%96%ad%e5%ad%97%e6%ae%b5%e6%98%af%e5%90%a6%e5%9c%a8%e5%88%97%e8%a1%a8%e4%b8%ad%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/7883\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 IF TEST \u8bed\u53e5\u5728 SQL \u4e2d\u5224\u65ad\u5b57\u6bb5\u662f\u5426\u5728\u5217\u8868\u4e2d\uff1f"},"content":{"rendered":"

\"\u5982\u4f55\u4f7f\u7528<\/p>\n

\u5728 sql \u4e2d\u4f7f\u7528 if test \u5224\u65ad\u5b57\u6bb5\u662f\u5426\u5728\u5217\u8868\u4e2d<\/strong><\/p>\n

\u5728\u573a\u666f\u4e2d\uff0c\u9700\u8981\u8fdb\u884c\u6279\u91cf\u66f4\u65b0\uff0c\u5176\u4e2d\u53d8\u91cf fieldnameslist \u50a8\u5b58\u4e86\u9700\u8981\u66f4\u65b0\u7684\u5b57\u6bb5\u540d\u3002\u4e3a\u4e86\u52a8\u6001\u66f4\u65b0\u7279\u5b9a\u5b57\u6bb5\uff0c\u9700\u8981\u4f7f\u7528 sql \u4e2d\u7684 if test \u8bed\u53e5\u6765\u5224\u65ad\u5b57\u6bb5\u662f\u5426\u5728\u5217\u8868\u4e2d\u3002<\/p>\n

\u4fee\u6539\u540e\u7684 xml \u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n

<update id=\"batchUpdateById\">\n    <foreach collection=\"entityList\" item=\"entity\" index=\"index1\" open=\"(\" close=\")\" separator=\";\">\n        UPDATE school_info SET\n        <if test='fieldNamesList.contains(\"schoolNo\")'>\n            schoolNo = #{entity.getSchoolNo}\n        <\/if>\n        <if test='fieldNamesList.contains(\"schoolRank\")'>\n            schoolRank = #{entity.getSchoolRank}\n        <\/if>\n        where dataId = #{entity.dataId}\n    <\/foreach>\n<\/update><\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u8be5\u4ee3\u7801\u4f7f\u7528 if test \u8bed\u53e5\u5224\u65ad fieldnameslist \u662f\u5426\u5305\u542b\u7279\u5b9a\u7684\u5b57\u6bb5\u540d\uff0c\u5982\u679c\u662f\uff0c\u5219\u66f4\u65b0\u8be5\u5b57\u6bb5\u4e3a\u5b9e\u4f53\u5bf9\u8c61\u4e2d\u76f8\u5e94\u7684\u503c\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u6839\u636e fieldnameslist \u52a8\u6001\u66f4\u65b0\u6307\u5b9a\u7684\u5b57\u6bb5\u4e86\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u4f7f\u7528 IF TEST \u8bed\u53e5\u5728 SQL \u4e2d\u5224\u65ad\u5b57\u6bb5\u662f\u5426\u5728\u5217\u8868\u4e2d\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728 sql \u4e2d\u4f7f\u7528 if test \u5224\u65ad\u5b57\u6bb5\u662f\u5426\u5728\u5217\u8868\u4e2d \u5728\u573a\u666f\u4e2d\uff0c\u9700\u8981\u8fdb\u884c\u6279\u91cf\u66f4\u65b0\uff0c\u5176\u4e2d\u53d8\u91cf fieldnameslist \u50a8\u5b58\u4e86\u9700\u8981\u66f4\u65b0\u7684\u5b57\u6bb5\u540d\u3002\u4e3a\u4e86\u52a8\u6001\u66f4\u65b0\u7279\u5b9a\u5b57\u6bb5\uff0c\u9700\u8981\u4f7f\u7528 sql \u4e2d\u7684 if test \u8bed\u53e5\u6765\u5224\u65ad\u5b57\u6bb5\u662f\u5426\u5728\u5217\u8868\u4e2d\u3002 \u4fee\u6539\u540e\u7684 xml \u4ee3\u7801\u5982\u4e0b\uff1a <update id=”batchUpdateById”> <foreach collection=”entityList” item=”entity” index=”index1″ open=”(” close=”)” separator=”;”> UPDATE school_info SET <if test=’fieldNamesList.contains(“schoolNo”)’> schoolNo = #{entity.getSchoolNo} <\/if> <if test=’fieldNamesList.contains(“schoolRank”)’> schoolRank = #{entity.getSchoolRank} <\/if> where dataId = #{entity.dataId} <\/foreach> <\/update> \u767b\u5f55\u540e\u590d\u5236 \u8be5\u4ee3\u7801\u4f7f\u7528 if test \u8bed\u53e5\u5224\u65ad fieldnameslist \u662f\u5426\u5305\u542b\u7279\u5b9a\u7684\u5b57\u6bb5\u540d\uff0c\u5982\u679c\u662f\uff0c\u5219\u66f4\u65b0\u8be5\u5b57\u6bb5\u4e3a\u5b9e\u4f53\u5bf9\u8c61\u4e2d\u76f8\u5e94\u7684\u503c\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u6839\u636e fieldnameslist […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-7883","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/7883","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=7883"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/7883\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=7883"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=7883"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=7883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}