{"id":5797,"date":"2024-11-14T08:20:50","date_gmt":"2024-11-14T00:20:50","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5797\/"},"modified":"2024-11-14T08:20:50","modified_gmt":"2024-11-14T00:20:50","slug":"mysql%e6%b8%b8%e6%a0%87%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5797\/","title":{"rendered":"mysql\u6e38\u6807\u662f\u4ec0\u4e48"},"content":{"rendered":"

\n mysql \u6e38\u6807\u662f\u4e00\u79cd\u53ef\u9010\u884c\u904d\u5386\u7ed3\u679c\u96c6\u7684\u673a\u5236\uff0c\u4ee5\u51cf\u5c11\u5185\u5b58\u5360\u7528\u3002\u5176\u5de5\u4f5c\u539f\u7406\u5305\u62ec\u58f0\u660e\u3001\u6253\u5f00\u548c\u5173\u95ed\uff0c\u5e76\u652f\u6301\u53ea\u8bfb\u3001\u53ea\u66f4\u65b0\u548c\u52a8\u6001\u7b49\u7c7b\u578b\u3002\u6e38\u6807\u7684\u4f18\u70b9\u5305\u62ec\u5185\u5b58\u6548\u7387\u3001\u884c\u5904\u7406\u80fd\u529b\u548c\u5c40\u90e8\u6027\uff1b\u7f3a\u70b9\u662f\u5f00\u9500\u548c\u5e76\u53d1\u63a7\u5236\u95ee\u9898\u3002\n<\/p><\/blockquote>\n

\"mysql\u6e38\u6807\u662f\u4ec0\u4e48\u63d2\u56fe\"<\/p>\n

\u4ec0\u4e48\u662f MySQL \u6e38\u6807\uff1f<\/strong><\/p>\n

MySQL \u6e38\u6807\u662f\u4e00\u79cd\u673a\u5236\uff0c\u5b83\u5141\u8bb8\u5e94\u7528\u7a0b\u5e8f\u5728\u6570\u636e\u5e93\u4e2d\u83b7\u53d6\u548c\u5904\u7406\u7ed3\u679c\u96c6\u4e2d\u7684\u884c\uff0c\u5e76\u4ee5\u9010\u884c\u7684\u987a\u5e8f\u904d\u5386\u5b83\u4eec\u3002\u6e38\u6807\u63d0\u4f9b\u4e86\u4e00\u79cd\u6709\u6548\u7684\u65b9\u6cd5\u6765\u5904\u7406\u5927\u578b\u6570\u636e\u96c6\uff0c\u800c\u65e0\u9700\u4e00\u6b21\u5c06\u6574\u4e2a\u7ed3\u679c\u96c6\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u3002<\/p>\n

\u6e38\u6807\u7684\u5de5\u4f5c\u539f\u7406\uff1a<\/strong><\/p>\n

    \n
  1. \u58f0\u660e\u6e38\u6807\uff1a<\/strong>\u4f7f\u7528 DECLARE CURSOR \u8bed\u53e5\u58f0\u660e\u4e00\u4e2a\u6e38\u6807\uff0c\u6307\u5b9a\u8981\u4ece\u5176\u4e2d\u68c0\u7d22\u6570\u636e\u7684\u67e5\u8be2\u3002<\/li>\n
  2. \u6253\u5f00\u6e38\u6807\uff1a<\/strong>\u4f7f\u7528 OPEN CURSOR \u8bed\u53e5\u6253\u5f00\u6e38\u6807\uff0c\u4f7f\u5e94\u7528\u7a0b\u5e8f\u80fd\u591f\u8bbf\u95ee\u7ed3\u679c\u96c6\u4e2d\u7684\u884c\u3002<\/li>\n
  3. \u68c0\u7d22\u884c\uff1a<\/strong>\u4f7f\u7528 FETCH \u8bed\u53e5\u68c0\u7d22\u6e38\u6807\u4e2d\u5f53\u524d\u6d3b\u52a8\u7684\u884c\u3002<\/li>\n
  4. \u5173\u95ed\u6e38\u6807\uff1a<\/strong>\u4f7f\u7528 CLOSE CURSOR \u8bed\u53e5\u5173\u95ed\u6e38\u6807\uff0c\u91ca\u653e\u4e0e\u6e38\u6807\u5173\u8054\u7684\u8d44\u6e90\u3002<\/li>\n<\/ol>\n

    \u6e38\u6807\u7684\u7c7b\u578b\uff1a<\/strong><\/p>\n

      \n
    • \u53ea\u8bfb\u6e38\u6807\uff1a<\/strong>\u53ea\u80fd\u5411\u524d\u904d\u5386\u7ed3\u679c\u96c6\uff0c\u4e0d\u80fd\u8fdb\u884c\u63d2\u5165\u3001\u66f4\u65b0\u6216\u5220\u9664\u64cd\u4f5c\u3002<\/li>\n
    • \u53ea\u66f4\u65b0\u6e38\u6807\uff1a<\/strong>\u9664\u4e86\u68c0\u7d22\u884c\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u66f4\u65b0\u5f53\u524d\u884c\u3002<\/li>\n
    • \u52a8\u6001\u6e38\u6807\uff1a<\/strong>\u5728\u6e38\u6807\u88ab\u6253\u5f00\u540e\uff0c\u53ef\u4ee5\u5bf9\u7ed3\u679c\u96c6\u8fdb\u884c\u4fee\u6539\u3002<\/li>\n<\/ul>\n

      \u6e38\u6807\u7684\u4f18\u70b9\uff1a<\/strong><\/p>\n

        \n
      • \u5185\u5b58\u6548\u7387\uff1a<\/strong>\u6e38\u6807\u4e00\u6b21\u53ea\u52a0\u8f7d\u4e00\u884c\uff0c\u4ece\u800c\u51cf\u5c11\u4e86\u5185\u5b58\u6d88\u8017\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u5927\u578b\u7ed3\u679c\u96c6\u65f6\u3002<\/li>\n
      • \u884c\u5904\u7406\uff1a<\/strong>\u6e38\u6807\u5141\u8bb8\u5e94\u7528\u7a0b\u5e8f\u9010\u884c\u5904\u7406\u6570\u636e\uff0c\u8fd9\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u662f\u5fc5\u8981\u7684\uff0c\u4f8b\u5982\u5f53\u9700\u8981\u5bf9\u6bcf\u4e2a\u884c\u8fdb\u884c\u590d\u6742\u5904\u7406\u65f6\u3002<\/li>\n
      • \u5c40\u90e8\u6027\uff1a<\/strong>\u6e38\u6807\u5c06\u7ed3\u679c\u96c6\u5b58\u50a8\u5728\u670d\u52a1\u5668\u4e0a\uff0c\u8fd9\u63d0\u9ad8\u4e86\u5e94\u7528\u7a0b\u5e8f\u7684\u5c40\u90e8\u6027\u548c\u6027\u80fd\u3002<\/li>\n<\/ul>\n

        \u6e38\u6807\u7684\u7f3a\u70b9\uff1a<\/strong><\/p>\n

          \n
        • \u5f00\u9500\uff1a<\/strong>\u58f0\u660e\u3001\u6253\u5f00\u548c\u5173\u95ed\u6e38\u6807\u4f1a\u4ea7\u751f\u989d\u5916\u7684\u5f00\u9500\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u5c24\u5176\u662f\u5728\u5904\u7406\u5c0f\u6570\u636e\u96c6\u65f6\u3002<\/li>\n
        • \u5e76\u53d1\u63a7\u5236\uff1a<\/strong>\u6e38\u6807\u5728\u5904\u7406\u8fc7\u7a0b\u4e2d\u4f1a\u9501\u5b9a\u7ed3\u679c\u96c6\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e0e\u5176\u4ed6\u5ba2\u6237\u7aef\u7684\u5e76\u53d1\u95ee\u9898\u3002<\/li>\n<\/ul>\n

          \u4ee5\u4e0a\u5c31\u662f\u6e38\u6807\u662f\u4ec0\u4e48\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":"

          mysql \u6e38\u6807\u662f\u4e00\u79cd\u53ef\u9010\u884c\u904d\u5386\u7ed3\u679c\u96c6\u7684\u673a\u5236\uff0c\u4ee5\u51cf\u5c11\u5185\u5b58\u5360\u7528\u3002\u5176\u5de5\u4f5c\u539f\u7406\u5305\u62ec\u58f0\u660e\u3001\u6253\u5f00\u548c\u5173\u95ed\uff0c\u5e76\u652f\u6301\u53ea\u8bfb\u3001\u53ea\u66f4\u65b0\u548c\u52a8\u6001\u7b49\u7c7b\u578b\u3002\u6e38\u6807\u7684\u4f18\u70b9\u5305\u62ec\u5185\u5b58\u6548\u7387\u3001\u884c\u5904\u7406\u80fd\u529b\u548c\u5c40\u90e8\u6027\uff1b\u7f3a\u70b9\u662f\u5f00\u9500\u548c\u5e76\u53d1\u63a7\u5236\u95ee\u9898\u3002 \u4ec0\u4e48\u662f MySQL \u6e38\u6807\uff1f MySQL \u6e38\u6807\u662f\u4e00\u79cd\u673a\u5236\uff0c\u5b83\u5141\u8bb8\u5e94\u7528\u7a0b\u5e8f\u5728\u6570\u636e\u5e93\u4e2d\u83b7\u53d6\u548c\u5904\u7406\u7ed3\u679c\u96c6\u4e2d\u7684\u884c\uff0c\u5e76\u4ee5\u9010\u884c\u7684\u987a\u5e8f\u904d\u5386\u5b83\u4eec\u3002\u6e38\u6807\u63d0\u4f9b\u4e86\u4e00\u79cd\u6709\u6548\u7684\u65b9\u6cd5\u6765\u5904\u7406\u5927\u578b\u6570\u636e\u96c6\uff0c\u800c\u65e0\u9700\u4e00\u6b21\u5c06\u6574\u4e2a\u7ed3\u679c\u96c6\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u3002 \u6e38\u6807\u7684\u5de5\u4f5c\u539f\u7406\uff1a \u58f0\u660e\u6e38\u6807\uff1a\u4f7f\u7528 DECLARE CURSOR \u8bed\u53e5\u58f0\u660e\u4e00\u4e2a\u6e38\u6807\uff0c\u6307\u5b9a\u8981\u4ece\u5176\u4e2d\u68c0\u7d22\u6570\u636e\u7684\u67e5\u8be2\u3002 \u6253\u5f00\u6e38\u6807\uff1a\u4f7f\u7528 OPEN CURSOR \u8bed\u53e5\u6253\u5f00\u6e38\u6807\uff0c\u4f7f\u5e94\u7528\u7a0b\u5e8f\u80fd\u591f\u8bbf\u95ee\u7ed3\u679c\u96c6\u4e2d\u7684\u884c\u3002 \u68c0\u7d22\u884c\uff1a\u4f7f\u7528 FETCH \u8bed\u53e5\u68c0\u7d22\u6e38\u6807\u4e2d\u5f53\u524d\u6d3b\u52a8\u7684\u884c\u3002 \u5173\u95ed\u6e38\u6807\uff1a\u4f7f\u7528 CLOSE CURSOR \u8bed\u53e5\u5173\u95ed\u6e38\u6807\uff0c\u91ca\u653e\u4e0e\u6e38\u6807\u5173\u8054\u7684\u8d44\u6e90\u3002 \u6e38\u6807\u7684\u7c7b\u578b\uff1a \u53ea\u8bfb\u6e38\u6807\uff1a\u53ea\u80fd\u5411\u524d\u904d\u5386\u7ed3\u679c\u96c6\uff0c\u4e0d\u80fd\u8fdb\u884c\u63d2\u5165\u3001\u66f4\u65b0\u6216\u5220\u9664\u64cd\u4f5c\u3002 \u53ea\u66f4\u65b0\u6e38\u6807\uff1a\u9664\u4e86\u68c0\u7d22\u884c\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u66f4\u65b0\u5f53\u524d\u884c\u3002 \u52a8\u6001\u6e38\u6807\uff1a\u5728\u6e38\u6807\u88ab\u6253\u5f00\u540e\uff0c\u53ef\u4ee5\u5bf9\u7ed3\u679c\u96c6\u8fdb\u884c\u4fee\u6539\u3002 \u6e38\u6807\u7684\u4f18\u70b9\uff1a \u5185\u5b58\u6548\u7387\uff1a\u6e38\u6807\u4e00\u6b21\u53ea\u52a0\u8f7d\u4e00\u884c\uff0c\u4ece\u800c\u51cf\u5c11\u4e86\u5185\u5b58\u6d88\u8017\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u5927\u578b\u7ed3\u679c\u96c6\u65f6\u3002 \u884c\u5904\u7406\uff1a\u6e38\u6807\u5141\u8bb8\u5e94\u7528\u7a0b\u5e8f\u9010\u884c\u5904\u7406\u6570\u636e\uff0c\u8fd9\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u662f\u5fc5\u8981\u7684\uff0c\u4f8b\u5982\u5f53\u9700\u8981\u5bf9\u6bcf\u4e2a\u884c\u8fdb\u884c\u590d\u6742\u5904\u7406\u65f6\u3002 \u5c40\u90e8\u6027\uff1a\u6e38\u6807\u5c06\u7ed3\u679c\u96c6\u5b58\u50a8\u5728\u670d\u52a1\u5668\u4e0a\uff0c\u8fd9\u63d0\u9ad8\u4e86\u5e94\u7528\u7a0b\u5e8f\u7684\u5c40\u90e8\u6027\u548c\u6027\u80fd\u3002 \u6e38\u6807\u7684\u7f3a\u70b9\uff1a \u5f00\u9500\uff1a\u58f0\u660e\u3001\u6253\u5f00\u548c\u5173\u95ed\u6e38\u6807\u4f1a\u4ea7\u751f\u989d\u5916\u7684\u5f00\u9500\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u5c24\u5176\u662f\u5728\u5904\u7406\u5c0f\u6570\u636e\u96c6\u65f6\u3002 \u5e76\u53d1\u63a7\u5236\uff1a\u6e38\u6807\u5728\u5904\u7406\u8fc7\u7a0b\u4e2d\u4f1a\u9501\u5b9a\u7ed3\u679c\u96c6\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e0e\u5176\u4ed6\u5ba2\u6237\u7aef\u7684\u5e76\u53d1\u95ee\u9898\u3002 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