{"id":5690,"date":"2024-11-14T08:12:12","date_gmt":"2024-11-14T00:12:12","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5690\/"},"modified":"2024-11-14T08:12:12","modified_gmt":"2024-11-14T00:12:12","slug":"sql%e6%b8%b8%e6%a0%87%e5%ae%9e%e4%be%8b%e6%80%8e%e4%b9%88%e7%94%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5690\/","title":{"rendered":"sql\u6e38\u6807\u5b9e\u4f8b\u600e\u4e48\u7528"},"content":{"rendered":"

\n sql \u6e38\u6807\u662f\u4e00\u79cd\u9010\u884c\u8bbf\u95ee\u7ed3\u679c\u96c6\u7684\u673a\u5236\uff0c\u7c7b\u4f3c\u6307\u9488\uff0c\u6307\u5411\u5f53\u524d\u884c\u3002\u4f18\u52bf\u5728\u4e8e\u5185\u5b58\u6d88\u8017\u4f4e\u548c\u591a\u6b21\u56de\u8bbf\u80fd\u529b\uff0c\u4f46\u76f8\u5bf9\u590d\u6742\uff0c\u5728 sql server \u4ec5\u9650\u4e8e\u5b58\u50a8\u8fc7\u7a0b\u6216 t-sql \u6279\u5904\u7406\u3002\n<\/p><\/blockquote>\n

\"sql\u6e38\u6807\u5b9e\u4f8b\u600e\u4e48\u7528\u63d2\u56fe\"<\/p>\n

SQL \u6e38\u6807\u7b80\u4ecb<\/strong><\/p>\n

SQL \u6e38\u6807\u662f\u4e00\u79cd\u5141\u8bb8\u7a0b\u5e8f\u9010\u884c\u8bbf\u95ee\u7ed3\u679c\u96c6\u7684\u673a\u5236\u3002\u5b83\u7c7b\u4f3c\u4e8e\u6307\u9488\uff0c\u6307\u5411\u7ed3\u679c\u96c6\u4e2d\u7684\u5f53\u524d\u884c\u3002<\/p>\n

\u5b9e\u4f8b<\/strong><\/p>\n

\u521b\u5efa\u6e38\u6807<\/strong><\/p>\n

DECLARE cursor_name CURSOR FOR\nSELECT * FROM table_name;<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u6253\u5f00\u6e38\u6807<\/strong><\/p>\n
OPEN cursor_name;<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u83b7\u53d6\u5f53\u524d\u884c<\/strong><\/p>\n
FETCH NEXT FROM cursor_name INTO variable1, variable2, ...;<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u4f7f\u7528\u5f53\u524d\u884c\u7684\u503c<\/strong><\/p>\n
-- cursor_name\nprint variable1\nprint variable2<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u79fb\u52a8\u6e38\u6807<\/strong><\/p>\n
    \n
  •  FETCH NEXT<\/strong>\uff1a\u524d\u8fdb\u5230\u4e0b\u4e00\u884c\u3002<\/li>\n
  •  FETCH PREVIOUS<\/strong>\uff1a\u540e\u9000\u5230\u4e0a\u4e00\u884c\u3002<\/li>\n
  •  FETCH FIRST<\/strong>\uff1a\u79fb\u52a8\u5230\u7b2c\u4e00\u884c\u3002<\/li>\n
  •  FETCH LAST<\/strong>\uff1a\u79fb\u52a8\u5230\u6700\u540e\u4e00\u884c\u3002<\/li>\n<\/ul>\n
    \u5173\u95ed\u6e38\u6807<\/strong><\/p>\n
    CLOSE cursor_name;<\/pre>\n
      \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
    \u5b9e\u4f8b<\/strong><\/p>\n
    DECLARE employee_cursor CURSOR FOR\nSELECT employee_id, first_name, last_name\nFROM employees;\n\nOPEN employee_cursor;\n\nFETCH NEXT FROM employee_cursor INTO e_id, f_name, l_name;\n\n-- \u6253\u5370\u5f53\u524d\u884c\u503c\nPRINT e_id, f_name, l_name;\n\n-- \u79fb\u52a8\u5230\u4e0b\u4e00\u884c\nFETCH NEXT FROM employee_cursor INTO e_id, f_name, l_name;\n\n-- \u6253\u5370\u5f53\u524d\u884c\u503c\nPRINT e_id, f_name, l_name;\n\nCLOSE employee_cursor;<\/pre>\n
      \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
    \u4f18\u70b9<\/strong><\/p>\n
      \n
    • \u9010\u884c\u5904\u7406\u7ed3\u679c\u96c6\uff0c\u51cf\u5c11\u5185\u5b58\u6d88\u8017\u3002<\/li>\n
    • \u5141\u8bb8\u5bf9\u7ed3\u679c\u96c6\u8fdb\u884c\u591a\u6b21\u56de\u8bbf\u95ee\u3002<\/li>\n
    • \u63d0\u9ad8\u6027\u80fd\uff0c\u5c24\u5176\u662f\u5728\u5904\u7406\u5927\u578b\u7ed3\u679c\u96c6\u65f6\u3002<\/li>\n<\/ul>\n
      \u7f3a\u70b9<\/strong><\/p>\n
        \n
      • \u6bd4\u5176\u4ed6\u65b9\u6cd5\u66f4\u590d\u6742\u3002<\/li>\n
      • \u5728 SQL Server \u4e2d\uff0c\u53ea\u80fd\u5728 stored procedures<\/strong>\u6216 T-SQL \u6279\u5904\u7406<\/strong>\u4e2d\u4f7f\u7528\u3002<\/li>\n<\/ul>\n
        \u4ee5\u4e0a\u5c31\u662fsql\u6e38\u6807\u5b9e\u4f8b\u600e\u4e48\u7528\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":"
        sql \u6e38\u6807\u662f\u4e00\u79cd\u9010\u884c\u8bbf\u95ee\u7ed3\u679c\u96c6\u7684\u673a\u5236\uff0c\u7c7b\u4f3c\u6307\u9488\uff0c\u6307\u5411\u5f53\u524d\u884c\u3002\u4f18\u52bf\u5728\u4e8e\u5185\u5b58\u6d88\u8017\u4f4e\u548c\u591a\u6b21\u56de\u8bbf\u80fd\u529b\uff0c\u4f46\u76f8\u5bf9\u590d\u6742\uff0c\u5728 sql server \u4ec5\u9650\u4e8e\u5b58\u50a8\u8fc7\u7a0b\u6216 t-sql \u6279\u5904\u7406\u3002 SQL \u6e38\u6807\u7b80\u4ecb SQL \u6e38\u6807\u662f\u4e00\u79cd\u5141\u8bb8\u7a0b\u5e8f\u9010\u884c\u8bbf\u95ee\u7ed3\u679c\u96c6\u7684\u673a\u5236\u3002\u5b83\u7c7b\u4f3c\u4e8e\u6307\u9488\uff0c\u6307\u5411\u7ed3\u679c\u96c6\u4e2d\u7684\u5f53\u524d\u884c\u3002 \u5b9e\u4f8b \u521b\u5efa\u6e38\u6807 DECLARE cursor_name CURSOR FOR SELECT * FROM table_name; \u767b\u5f55\u540e\u590d\u5236 \u6253\u5f00\u6e38\u6807 OPEN cursor_name; \u767b\u5f55\u540e\u590d\u5236 \u83b7\u53d6\u5f53\u524d\u884c FETCH NEXT FROM cursor_name INTO variable1, variable2, …; \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528\u5f53\u524d\u884c\u7684\u503c — cursor_name print variable1 print variable2 \u767b\u5f55\u540e\u590d\u5236 \u79fb\u52a8\u6e38\u6807 FETCH NEXT\uff1a\u524d\u8fdb\u5230\u4e0b\u4e00\u884c\u3002 FETCH PREVIOUS\uff1a\u540e\u9000\u5230\u4e0a\u4e00\u884c\u3002 FETCH FIRST\uff1a\u79fb\u52a8\u5230\u7b2c\u4e00\u884c\u3002 FETCH LAST\uff1a\u79fb\u52a8\u5230\u6700\u540e\u4e00\u884c\u3002 \u5173\u95ed\u6e38\u6807 CLOSE […]<\/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-5690","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5690","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=5690"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5690\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5690"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5690"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5690"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}