{"id":5279,"date":"2021-05-30T00:20:58","date_gmt":"2021-05-29T16:20:58","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=5279"},"modified":"2021-05-30T00:20:58","modified_gmt":"2021-05-29T16:20:58","slug":"mysql-prepare%e8%af%ad%e5%8f%a5%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/5279","title":{"rendered":"mysql prepare\u8bed\u53e5\u4f7f\u7528"},"content":{"rendered":"
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\u539f\u6587\u5730\u5740<\/a><\/p>\n

 <\/p>\n<\/div>\n

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\"\"<\/p>\n
\u4e00\u9897\u5411\u4e0a\u7684\u8349\u8393<\/a>\u00a02019-05-28 10:25:57<\/span>\u00a0\"\"\u00a05049<\/span>\u00a0<\/a>\"\"\u00a0\u6536\u85cf<\/span>\u00a03<\/span><\/div>\n<\/div>\n
\n
\u5206\u7c7b\u4e13\u680f\uff1a<\/span>\u00a0\u6570\u636e\u5e93\u2014Mysql<\/a>\u00a0\u6587\u7ae0\u6807\u7b7e\uff1a<\/span>\u00a0mysql\u4e2dprepare\u8bed\u53e5\u7684\u4f7f\u7528<\/a><\/div>\n<\/div>\n
<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\n
\n
\n

\u8bed\u6cd5<\/p>\n

<\/code><\/pre>\n
    \n
  1. \n
    \n
    <\/div>\n<\/div>\n
    \n
    PREPARE<\/span> statement_name FROM<\/span> sql_text \/*\u5b9a\u4e49*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  2. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  3. \n
    \n
    <\/div>\n<\/div>\n
    \n
    EXECUTE<\/span> statement_name [USING<\/span> variable<\/span> [,variable…]] \/*\u6267\u884c\u9884\u5904\u7406\u8bed\u53e5*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  4. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  5. \n
    \n
    <\/div>\n<\/div>\n
    \n
    DEALLOCATE<\/span> PREPARE<\/span> statement_name \/*\u5220\u9664\u5b9a\u4e49*\/<\/span><\/div>\n<\/div>\n<\/li>\n<\/ol>\n
    <\/code><\/pre>\n
    \u4f8b<\/p>\n
    <\/code><\/pre>\n
      \n
    1. \n
      \n
      <\/div>\n<\/div>\n
      \n
      mysql> PREPARE<\/span> prod FROM<\/span> “INSERT INTO examlple VALUES(?,?)”<\/span>;<\/div>\n<\/div>\n<\/li>\n
    2. \n
      \n
      <\/div>\n<\/div>\n
      \n
      <\/div>\n<\/div>\n<\/li>\n
    3. \n
      \n
      <\/div>\n<\/div>\n
      \n
      mysql> SET<\/span> @p=‘1’<\/span>;<\/div>\n<\/div>\n<\/li>\n
    4. \n
      \n
      <\/div>\n<\/div>\n
      \n
      <\/div>\n<\/div>\n<\/li>\n
    5. \n
      \n
      <\/div>\n<\/div>\n
      \n
      mysql> SET<\/span> @q=‘2’<\/span>;<\/div>\n<\/div>\n<\/li>\n
    6. \n
      \n
      <\/div>\n<\/div>\n
      \n
      <\/div>\n<\/div>\n<\/li>\n
    7. \n
      \n
      <\/div>\n<\/div>\n
      \n
      mysql> EXECUTE<\/span> prod USING<\/span> @p,@q;<\/div>\n<\/div>\n<\/li>\n
    8. \n
      \n
      <\/div>\n<\/div>\n
      \n
      <\/div>\n<\/div>\n<\/li>\n
    9. \n
      \n
      <\/div>\n<\/div>\n
      \n
      mysql> SET<\/span> @name<\/span>=‘3’<\/span>;<\/div>\n<\/div>\n<\/li>\n
    10. \n
      \n
      <\/div>\n<\/div>\n
      \n
      <\/div>\n<\/div>\n<\/li>\n
    11. \n
      \n
      <\/div>\n<\/div>\n
      \n
      mysql> EXECUTE<\/span> prod USING<\/span> @p,@name<\/span>;<\/div>\n<\/div>\n<\/li>\n
    12. \n
      \n
      <\/div>\n<\/div>\n
      \n
      <\/div>\n<\/div>\n<\/li>\n
    13. \n
      \n
      <\/div>\n<\/div>\n
      \n
      mysql> DEALLOCATE<\/span> PREPARE<\/span> prod;<\/div>\n<\/div>\n<\/li>\n<\/ol>\n
      <\/code><\/pre>\n
      1.\u7528\u53d8\u91cf\u505a\u8868\u540d\uff1a \u7b80\u5355\u7684\u7528set\u6216\u8005declare\u8bed\u53e5\u5b9a\u4e49\u53d8\u91cf\uff0c\u7136\u540e\u76f4\u63a5\u4f5c\u4e3asql\u7684\u8868\u540d\u662f\u4e0d\u884c\u7684\uff0cmysql\u4f1a\u628a\u53d8\u91cf\u540d\u5f53\u4f5c\u8868\u540d\u3002\u5728\u5176\u4ed6\u7684sql\u6570\u636e\u5e93\u4e2d\u4e5f\u662f\u5982\u6b64\uff0cmssql\u7684\u89e3\u51b3\u65b9\u6cd5\u662f\u5c06\u6574\u6761sql\u8bed\u53e5\u4f5c\u4e3a\u53d8\u91cf\uff0c\u5176\u4e2d\u7a7f\u63d2\u53d8\u91cf\u4f5c\u4e3a\u8868\u540d\uff0c\u7136\u540e\u7528sp_executesql\u8c03\u7528\u8be5\u8bed\u53e5\u3002 \u8fd9\u5728mysql5.0\u4e4b\u524d\u662f\u4e0d\u884c\u7684\uff0c5.0\u4e4b\u540e\u5f15\u5165\u4e86\u4e00\u4e2a\u5168\u65b0\u7684\u8bed\u53e5\uff0c\u53ef\u4ee5\u8fbe\u5230\u7c7b\u4f3csp_executesql\u7684\u529f\u80fd\uff08\u4ec5\u5bf9procedure\u6709\u6548\uff0cfunction\u4e0d\u652f\u6301\u52a8\u6001\u67e5\u8be2\uff09\uff1a<\/p>\n
      PREPARE stmt_name FROM preparable_stmt;
      \nEXECUTE stmt_name [USING @var_name [, @var_name] …];
      \n{DEALLOCATE | DROP} PREPARE stmt_name;<\/p>\n
      \u4e3a\u4e86\u6709\u4e00\u4e2a\u611f\u6027\u7684\u8ba4\u8bc6\uff0c\u4e0b\u9762\u5148\u7ed9\u51e0\u4e2a\u5c0f\u4f8b\u5b50\uff1a<\/p>\n
      <\/code><\/pre>\n
        \n
      1. \n
        \n
        <\/div>\n<\/div>\n
        \n
        mysql> PREPARE<\/span> stmt1 FROM<\/span> ‘SELECT SQRT(POW(?,2) + POW(?,2)) AS hypotenuse’<\/span>;<\/div>\n<\/div>\n<\/li>\n
      2. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      3. \n
        \n
        <\/div>\n<\/div>\n
        \n
        mysql> SET<\/span> @a = 3<\/span>;<\/div>\n<\/div>\n<\/li>\n
      4. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      5. \n
        \n
        <\/div>\n<\/div>\n
        \n
        mysql> SET<\/span> @b = 4<\/span>;<\/div>\n<\/div>\n<\/li>\n
      6. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      7. \n
        \n
        <\/div>\n<\/div>\n
        \n
        mysql> EXECUTE<\/span> stmt1 USING<\/span> @a, @b;<\/div>\n<\/div>\n<\/li>\n
      8. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      9. \n
        \n
        <\/div>\n<\/div>\n
        \n
        +————+<\/span><\/div>\n<\/div>\n<\/li>\n
      10. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      11. \n
        \n
        <\/div>\n<\/div>\n
        \n
        | hypotenuse |<\/div>\n<\/div>\n<\/li>\n
      12. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      13. \n
        \n
        <\/div>\n<\/div>\n
        \n
        +————+<\/span><\/div>\n<\/div>\n<\/li>\n
      14. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      15. \n
        \n
        <\/div>\n<\/div>\n
        \n
        | 5 |<\/div>\n<\/div>\n<\/li>\n
      16. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      17. \n
        \n
        <\/div>\n<\/div>\n
        \n
        +————+<\/span><\/div>\n<\/div>\n<\/li>\n
      18. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      19. \n
        \n
        <\/div>\n<\/div>\n
        \n
        mysql> DEALLOCATE<\/span> PREPARE<\/span> stmt1;<\/div>\n<\/div>\n<\/li>\n
      20. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      21. \n
        \n
        <\/div>\n<\/div>\n
        \n
        mysql> SET<\/span> @s = ‘SELECT SQRT(POW(?,2) + POW(?,2)) AS hypotenuse’<\/span>;<\/div>\n<\/div>\n<\/li>\n
      22. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      23. \n
        \n
        <\/div>\n<\/div>\n
        \n
        mysql> PREPARE<\/span> stmt2 FROM<\/span> @s;<\/div>\n<\/div>\n<\/li>\n
      24. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      25. \n
        \n
        <\/div>\n<\/div>\n
        \n
        mysql> SET<\/span> @a = 6<\/span>;<\/div>\n<\/div>\n<\/li>\n
      26. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      27. \n
        \n
        <\/div>\n<\/div>\n
        \n
        mysql> SET<\/span> @b = 8<\/span>;<\/div>\n<\/div>\n<\/li>\n
      28. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      29. \n
        \n
        <\/div>\n<\/div>\n
        \n
        mysql> EXECUTE<\/span> stmt2 USING<\/span> @a, @b;<\/div>\n<\/div>\n<\/li>\n
      30. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      31. \n
        \n
        <\/div>\n<\/div>\n
        \n
        +————+<\/span><\/div>\n<\/div>\n<\/li>\n
      32. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      33. \n
        \n
        <\/div>\n<\/div>\n
        \n
        | hypotenuse |<\/div>\n<\/div>\n<\/li>\n
      34. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      35. \n
        \n
        <\/div>\n<\/div>\n
        \n
        +————+<\/span><\/div>\n<\/div>\n<\/li>\n
      36. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      37. \n
        \n
        <\/div>\n<\/div>\n
        \n
        | 10 |<\/div>\n<\/div>\n<\/li>\n
      38. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      39. \n
        \n
        <\/div>\n<\/div>\n
        \n
        +————+<\/span><\/div>\n<\/div>\n<\/li>\n
      40. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      41. \n
        \n
        <\/div>\n<\/div>\n
        \n
        mysql> DEALLOCATE<\/span> PREPARE<\/span> stmt2;<\/div>\n<\/div>\n<\/li>\n<\/ol>\n
        <\/code><\/pre>\n
         <\/p>\n
        \u5982\u679c\u4f60\u7684MySQL \u7248\u672c\u662f 5.0.7 \u6216\u8005\u66f4\u9ad8\u7684\uff0c\u4f60\u8fd8\u53ef\u4ee5\u5728 LIMIT \u5b50\u53e5\u4e2d\u4f7f\u7528\u5b83\uff0c\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n
        <\/code><\/pre>\n
          \n
        1. \n
          \n
          <\/div>\n<\/div>\n
          \n
          mysql> SET<\/span> @a=1<\/span>;<\/div>\n<\/div>\n<\/li>\n
        2. \n
          \n
          <\/div>\n<\/div>\n
          \n
          <\/div>\n<\/div>\n<\/li>\n
        3. \n
          \n
          <\/div>\n<\/div>\n
          \n
          mysql> PREPARE<\/span> STMT FROM<\/span> “SELECT * FROM tbl LIMIT ?”<\/span>;<\/div>\n<\/div>\n<\/li>\n
        4. \n
          \n
          <\/div>\n<\/div>\n
          \n
          <\/div>\n<\/div>\n<\/li>\n
        5. \n
          \n
          <\/div>\n<\/div>\n
          \n
          mysql> EXECUTE<\/span> STMT USING<\/span> @a;<\/div>\n<\/div>\n<\/li>\n
        6. \n
          \n
          <\/div>\n<\/div>\n
          \n
          <\/div>\n<\/div>\n<\/li>\n
        7. \n
          \n
          <\/div>\n<\/div>\n
          \n
          mysql> SET<\/span> @skip<\/span>=1<\/span>; SET<\/span> @numrows=5<\/span>;<\/div>\n<\/div>\n<\/li>\n
        8. \n
          \n
          <\/div>\n<\/div>\n
          \n
          <\/div>\n<\/div>\n<\/li>\n
        9. \n
          \n
          <\/div>\n<\/div>\n
          \n
          mysql> PREPARE<\/span> STMT FROM<\/span> “SELECT * FROM tbl LIMIT ?, ?”<\/span>;<\/div>\n<\/div>\n<\/li>\n
        10. \n
          \n
          <\/div>\n<\/div>\n
          \n
          <\/div>\n<\/div>\n<\/li>\n
        11. \n
          \n
          <\/div>\n<\/div>\n
          \n
          mysql> EXECUTE<\/span> STMT USING<\/span> @skip<\/span>, @numrows;<\/div>\n<\/div>\n<\/li>\n<\/ol>\n
          <\/code><\/pre>\n
          \u4f7f\u7528 PREPARE \u7684\u51e0\u4e2a\u6ce8\u610f\u70b9\uff1a
          \nA\uff1aPREPARE stmt_name FROM preparable_stmt;\u9884\u5b9a\u4e49\u4e00\u4e2a\u8bed\u53e5\uff0c\u5e76\u5c06\u5b83\u8d4b\u7ed9 stmt_name \uff0ctmt_name \u662f\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u7684\u3002
          \nB\uff1a \u5373\u4f7f preparable_stmt \u8bed\u53e5\u4e2d\u7684 ? \u6240\u4ee3\u8868\u7684\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u4f60\u4e5f\u4e0d\u9700\u8981\u5c06 ? \u7528\u5f15\u53f7\u5305\u542b\u8d77\u6765\u3002
          \nC\uff1a \u5982\u679c\u65b0\u7684 PREPARE \u8bed\u53e5\u4f7f\u7528\u4e86\u4e00\u4e2a\u5df2\u5b58\u5728\u7684 stmt_name \uff0c\u90a3\u4e48\u539f\u6709\u7684\u5c06\u88ab\u7acb\u5373\u91ca\u653e\uff01 \u5373\u4f7f\u8fd9\u4e2a\u65b0\u7684 PREPARE \u8bed\u53e5\u56e0\u4e3a\u9519\u8bef\u800c\u4e0d\u80fd\u88ab\u6b63\u786e\u6267\u884c\u3002
          \nD\uff1a PREPARE stmt_name \u7684\u4f5c\u7528\u57df\u662f\u5f53\u524d\u5ba2\u6237\u7aef\u8fde\u63a5\u4f1a\u8bdd\u53ef\u89c1\u3002
          \nE\uff1a \u8981\u91ca\u653e\u4e00\u4e2a\u9884\u5b9a\u4e49\u8bed\u53e5\u7684\u8d44\u6e90\uff0c\u53ef\u4ee5\u4f7f\u7528 DEALLOCATE PREPARE \u53e5\u6cd5\u3002
          \nF\uff1a EXECUTE stmt_name \u53e5\u6cd5\u4e2d\uff0c\u5982\u679c stmt_name \u4e0d\u5b58\u5728\uff0c\u5c06\u4f1a\u5f15\u53d1\u4e00\u4e2a\u9519\u8bef\u3002
          \nG\uff1a \u5982\u679c\u5728\u7ec8\u6b62\u5ba2\u6237\u7aef\u8fde\u63a5\u4f1a\u8bdd\u65f6\uff0c\u6ca1\u6709\u663e\u5f0f\u5730\u8c03\u7528 DEALLOCATE PREPARE \u53e5\u6cd5\u91ca\u653e\u8d44\u6e90\uff0c\u670d\u52a1\u5668\u7aef\u4f1a\u81ea\u5df1\u52a8\u91ca\u653e\u5b83\u3002
          \nH\uff1a \u5728\u9884\u5b9a\u4e49\u8bed\u53e5\u4e2d\uff0cCREATE TABLE, DELETE, DO, INSERT, REPLACE, SELECT, SET, UPDATE, \u548c\u5927\u90e8\u5206\u7684 SHOW \u53e5\u6cd5\u88ab\u652f\u6301\u3002
          \nI\uff1a PREPARE \u8bed\u53e5\u4e0d\u53ef\u4ee5\u7528\u4e8e\u5b58\u50a8\u8fc7\u7a0b\uff0c\u81ea\u5b9a\u4e49\u51fd\u6570\uff01\u4f46\u4ece MySQL 5.0.13 \u5f00\u59cb\uff0c\u5b83\u53ef\u4ee5\u88ab\u7528\u4e8e\u5b58\u50a8\u8fc7\u7a0b\uff0c\u4ecd\u4e0d\u652f\u6301\u5728\u51fd\u6570\u4e2d\u4f7f\u7528\uff01<\/p>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"
          \u539f\u6587\u5730\u5740   \u4e00\u9897\u5411\u4e0a\u7684\u8349\u8393\u00a0<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[118],"class_list":["post-5279","post","type-post","status-publish","format-standard","hentry","tag-02-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/5279","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=5279"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/5279\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=5279"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=5279"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=5279"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}