{"id":2428,"date":"2022-10-05T02:57:08","date_gmt":"2022-10-04T18:57:08","guid":{"rendered":"http:\/\/47.101.202.111\/?p=2428"},"modified":"2022-10-05T03:02:44","modified_gmt":"2022-10-04T19:02:44","slug":"prepared-statements-%e6%95%b0%e6%8d%ae%e5%ba%93%e5%b1%82%e9%9d%a2%e8%a7%a3%e5%86%b3sql%e6%b3%a8%e5%85%a5%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/139.196.114.170\/?p=2428","title":{"rendered":"Prepared Statements – \u6570\u636e\u5e93\u5c42\u9762\u89e3\u51b3SQL\u6ce8\u5165\u95ee\u9898"},"content":{"rendered":"

Java Web\u5f00\u53d1\u66f4\u63a8\u8350PreparedStatement\u6765\u8fdb\u884c\u52a8\u6001\u62fc\u88c5SQL\u8bed\u53e5\uff0c\u53ef\u4ee5\u9632\u6b62SQL\u6ce8\u5165\u548c\u5e26\u6765SQL\u6267\u884c\u6548\u7387\u63d0\u5347\uff0c\u5176\u5b9eSQL\u9884\u7f16\u8bd1\u673a\u5236\u662f\u6570\u636e\u5e93\u5b9e\u73b0\u7684\uff0c\u672c\u6587\u4ee5MySQL\u4e3a\u4f8b
\n<\/p>\n

Prepared Statements\u8bed\u6cd5<\/h3>\n
\n# \u521b\u5efa\u9884\u7f16\u8bd1\u8bed\u53e5psql1\nPREPARE psql1 FROM 'SELECT * FROM employee WHERE id = ? AND name = ?';\n# \u521b\u5efa\u7528\u6237\u81ea\u5b9a\u4e49\u53d8\u91cf@a=3\uff0c@b=\"Bob\"\nSET @a = 3;\nSET @b = \"Bob\";\n# \u6309\u987a\u5e8f\u4ee3\u5165\u5360\u4f4d\u7b26\u6570\u503c\u6267\u884c\u9884\u7f16\u8bd1\u8bed\u53e5\nEXECUTE USING @a, @b;\n# \u56de\u6536\u9884\u7f16\u8bd1\u8bed\u53e5\uff0c\u4e4b\u540e\u5c06\u4e0d\u80fd\u518dEXECUTE\u8be5\u8bed\u53e5\nDEALLOCATE PREPARE psql1;\n<\/pre>\n
Prepared Statement\u6ce8\u610f\u70b9<\/h3>\n
\u4f5c\u7528\u57df\uff1a\u4ec5\u5bf9\u5f53\u524dSession\u6709\u6548\uff0c\u4e14\u4ec5\u5728Session\u7ed3\u675f\u524d\u6709\u6548<\/p>\n
\u63a7\u5236\u6570\u91cf\uff1a\u8c03\u6574max_prepared_stmt_count\u7cfb\u7edf\u53d8\u91cf\uff0c\u9632\u6b62\u521b\u5efa\u592a\u591a\u8bed\u53e5\u5360\u7528\u8fc7\u591a\u5185\u5b58<\/p>\n
SQL\u9884\u7f16\u8bd1\u7684\u597d\u5904<\/h3>\n
\u6027\u80fd\u9ad8\uff1a\u4ec5\u9700\u4e00\u6b21\u7f16\u8bd1\uff0c\u65e0\u9700\u6bcf\u6b21\u6267\u884cSQL\u65f6\u90fd\u8fdb\u884c\u8bcd\u6cd5\u5206\u6790\u548c\u8bed\u6cd5\u5206\u6790\uff0c\u4e4b\u540e\u7684\u8fd0\u884c\u90fd\u4ec5\u4f20\u5165\u53c2\u6570<\/p>\n
\u9632\u6ce8\u5165\uff1a\u4ec5\u5bf9\u4f20\u5165\u53c2\u6570\u524d\u7684SQL\u8bed\u53e5\u8fdb\u884c\u7f16\u8bd1\u9636\u6bb5\u7684\u8bcd\u6cd5\u5206\u6790\u548c\u8bed\u6cd5\u5206\u6790\uff0c\u5360\u4f4d\u7b26\u4f20\u5165\u7684\u53c2\u6570\u4e0d\u53c2\u4e0e\u7f16\u8bd1\u9636\u6bb5\uff0c\u56e0\u6b64\u4e0d\u4f1a\u88ab\u5f53\u4f5cSQL\u7684\u6267\u884c\u8ba1\u5212<\/p>\n
Java Web\u9879\u76ee\u4e2d\u7684\u4f7f\u7528<\/h3>\n
JDBC\u4e2d\u7684PreparedStatement\u3001MyBatis\u4e2d\u7684#{param}\u5360\u4f4d\u7b26<\/p>\n
\u5f00\u542fSQL\u9884\u7f16\u8bd1\u548c\u9884\u7f16\u8bd1\u7f13\u5b58\uff1a\u8bbe\u7f6e\u6570\u636e\u6e90\u5c5e\u6027\u6216\u4f5c\u4e3aJDBC URL\u53c2\u6570<\/p>\n
useServerPrepStmts=true\ncachePrepStmts=true\n<\/code><\/pre>\n
\u53c2\u8003\u8d44\u6599<\/h3>\n
MySQL 8.0 Reference Manual  \/  SQL Statements  \/  Prepared Statements<\/a>
\nMySQL Connector\/J 8.0 Developer Guide  \/  Connector\/J Reference  \/  Configuration Properties<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Java Web\u5f00\u53d1\u66f4\u63a8\u8350PreparedStatement\u6765\u8fdb\u884c\u52a8\u6001\u62fc\u88c5SQL\u8bed\u53e5\uff0c\u53ef\u4ee5\u9632\u6b62SQL\u6ce8\u5165\u548c\u5e26\u6765 … <\/p>\n
\u7ee7\u7eed\u9605\u8bfb\u201cPrepared Statements – \u6570\u636e\u5e93\u5c42\u9762\u89e3\u51b3SQL\u6ce8\u5165\u95ee\u9898\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[40],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/posts\/2428"}],"collection":[{"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2428"}],"version-history":[{"count":4,"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/posts\/2428\/revisions"}],"predecessor-version":[{"id":2432,"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/posts\/2428\/revisions\/2432"}],"wp:attachment":[{"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2428"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2428"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2428"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}