{"id":60877,"date":"2024-10-13T06:34:15","date_gmt":"2024-10-12T22:34:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60877\/"},"modified":"2024-10-13T06:34:15","modified_gmt":"2024-10-12T22:34:15","slug":"db2%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%beoracle%e7%9a%84%e6%9f%90%e4%ba%9b%e5%8a%9f%e8%83%bd","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60877\/","title":{"rendered":"DB2\u6578\u64da\u5eab\u4e2d\u5982\u4f55\u5be6\u73feOracle\u7684\u67d0\u4e9b\u529f\u80fd"},"content":{"rendered":"<h1 id=\"db2%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%beoracle%e7%9a%84%e6%9f%90%e4%ba%9b%e5%8a%9f%e8%83%bd-epQaWQvpYI\">DB2\u6578\u64da\u5eab\u4e2d\u5982\u4f55\u5be6\u73feOracle\u7684\u67d0\u4e9b\u529f\u80fd<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u7ba1\u7406\u74b0\u5883\u4e2d\uff0cDB2\u548cOracle\u90fd\u662f\u5ee3\u6cdb\u4f7f\u7528\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u96d6\u7136\u9019\u5169\u8005\u5728\u529f\u80fd\u548c\u7279\u6027\u4e0a\u6709\u8a31\u591a\u76f8\u4f3c\u4e4b\u8655\uff0c\u4f46\u5b83\u5011\u7684\u5be6\u73fe\u65b9\u5f0f\u537b\u6709\u6240\u4e0d\u540c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728DB2\u4e2d\u5be6\u73feOracle\u7684\u4e00\u4e9b\u529f\u80fd\uff0c\u5e6b\u52a9\u7528\u6236\u66f4\u597d\u5730\u7406\u89e3\u9019\u5169\u7a2e\u6578\u64da\u5eab\u7684\u5dee\u7570\u53ca\u5176\u76f8\u4e92\u8f49\u63db\u7684\u53ef\u80fd\u6027\u3002<\/p>\n<h2 id=\"1-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e7%9a%84%e5%b0%8d%e6%87%89-epQaWQvpYI\">1. \u6578\u64da\u985e\u578b\u7684\u5c0d\u61c9<\/h2>\n<p>Oracle\u548cDB2\u5728\u6578\u64da\u985e\u578b\u4e0a\u6709\u4e00\u4e9b\u5dee\u7570\u3002\u4f8b\u5982\uff0cOracle\u7684VARCHAR2\u5728DB2\u4e2d\u5c0d\u61c9\u70baVARCHAR\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u6578\u64da\u985e\u578b\u7684\u5c0d\u61c9\u8868\uff1a<\/p>\n<ul>\n<li>Oracle VARCHAR2 \u2192 DB2 VARCHAR<\/li>\n<li>Oracle NUMBER \u2192 DB2 DECIMAL<\/li>\n<li>Oracle DATE \u2192 DB2 TIMESTAMP<\/li>\n<li>Oracle CLOB \u2192 DB2 CLOB<\/li>\n<\/ul>\n<p>\u5728\u9032\u884c\u6578\u64da\u9077\u79fb\u6642\uff0c\u4e86\u89e3\u9019\u4e9b\u5c0d\u61c9\u95dc\u4fc2\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u56e0\u70ba\u4e0d\u6b63\u78ba\u7684\u6578\u64da\u985e\u578b\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e1f\u5931\u6216\u932f\u8aa4\u3002<\/p>\n<h2 id=\"2-%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%e5%92%8c%e5%87%bd%e6%95%b8-epQaWQvpYI\">2. \u5b58\u5132\u904e\u7a0b\u548c\u51fd\u6578<\/h2>\n<p>Oracle\u7684\u5b58\u5132\u904e\u7a0b\u548c\u51fd\u6578\u53ef\u4ee5\u5728DB2\u4e2d\u901a\u904e\u5275\u5efa\u76f8\u61c9\u7684\u7a0b\u5e8f\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684Oracle\u5b58\u5132\u904e\u7a0b\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nCREATE OR REPLACE PROCEDURE get_employee_count\nAS\nBEGIN\n    SELECT COUNT(*) FROM employees;\nEND;\n<\/code><\/pre>\n<p>\u5728DB2\u4e2d\uff0c\u9019\u53ef\u4ee5\u8f49\u63db\u70ba\uff1a<\/p>\n<pre><code>\nCREATE PROCEDURE get_employee_count()\nBEGIN\n    DECLARE emp_count INT;\n    SELECT COUNT(*) INTO emp_count FROM employees;\n    RETURN emp_count;\nEND;\n<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u8f49\u63db\u9700\u8981\u6ce8\u610f\u8a9e\u6cd5\u7684\u5dee\u7570\uff0c\u7279\u5225\u662f\u5728\u8b8a\u91cf\u8072\u660e\u548c\u8fd4\u56de\u503c\u7684\u8655\u7406\u4e0a\u3002<\/p>\n<h2 id=\"3-%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e5%af%a6%e7%8f%be-epQaWQvpYI\">3. \u89f8\u767c\u5668\u7684\u5be6\u73fe<\/h2>\n<p>\u89f8\u767c\u5668\u5728Oracle\u548cDB2\u4e2d\u90fd\u53ef\u4ee5\u7528\u4f86\u81ea\u52d5\u57f7\u884c\u67d0\u4e9b\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662fOracle\u4e2d\u5275\u5efa\u89f8\u767c\u5668\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nCREATE OR REPLACE TRIGGER before_insert_employee\nBEFORE INSERT ON employees\nFOR EACH ROW\nBEGIN\n    :new.created_at := SYSDATE;\nEND;\n<\/code><\/pre>\n<p>\u5728DB2\u4e2d\uff0c\u9019\u53ef\u4ee5\u8f49\u63db\u70ba\uff1a<\/p>\n<pre><code>\nCREATE TRIGGER before_insert_employee\nBEFORE INSERT ON employees\nFOR EACH ROW\nBEGIN\n    SET NEW.created_at = CURRENT TIMESTAMP;\nEND;\n<\/code><\/pre>\n<p>\u89f8\u767c\u5668\u7684\u8f49\u63db\u9700\u8981\u7279\u5225\u6ce8\u610f\u6642\u9593\u51fd\u6578\u7684\u4f7f\u7528\uff0c\u56e0\u70baDB2\u548cOracle\u7684\u6642\u9593\u51fd\u6578\u6709\u6240\u4e0d\u540c\u3002<\/p>\n<h2 id=\"4-%e6%9f%a5%e8%a9%a2%e8%aa%9e%e6%b3%95%e7%9a%84%e5%b7%ae%e7%95%b0-epQaWQvpYI\">4. \u67e5\u8a62\u8a9e\u6cd5\u7684\u5dee\u7570<\/h2>\n<p>\u5728\u67e5\u8a62\u8a9e\u6cd5\u65b9\u9762\uff0cOracle\u548cDB2\u4e5f\u5b58\u5728\u4e00\u4e9b\u5dee\u7570\u3002\u4f8b\u5982\uff0cOracle\u4f7f\u7528ROWNUM\u4f86\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\uff0c\u800cDB2\u5247\u4f7f\u7528FETCH FIRST\u3002\u4ee5\u4e0b\u662fOracle\u7684\u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nSELECT * FROM employees WHERE ROWNUM &lt;= 10;\n<\/code><\/pre>\n<p>\u5728DB2\u4e2d\uff0c\u9019\u53ef\u4ee5\u5beb\u6210\uff1a<\/p>\n<pre><code>\nSELECT * FROM employees FETCH FIRST 10 ROWS ONLY;\n<\/code><\/pre>\n<p>\u9019\u4e9b\u8a9e\u6cd5\u5dee\u7570\u5728\u9032\u884c\u6578\u64da\u9077\u79fb\u6642\u9700\u8981\u7279\u5225\u6ce8\u610f\uff0c\u4ee5\u78ba\u4fdd\u67e5\u8a62\u7684\u6b63\u78ba\u6027\u3002<\/p>\n<h2 id=\"5-%e7%b8%bd%e7%b5%90-epQaWQvpYI\">5. \u7e3d\u7d50<\/h2>\n<p>\u5728DB2\u4e2d\u5be6\u73feOracle\u7684\u67d0\u4e9b\u529f\u80fd\u9700\u8981\u5c0d\u5169\u8005\u7684\u8a9e\u6cd5\u548c\u7279\u6027\u6709\u6df1\u5165\u7684\u4e86\u89e3\u3002\u901a\u904e\u6b63\u78ba\u7684\u6578\u64da\u985e\u578b\u5c0d\u61c9\u3001\u5b58\u5132\u904e\u7a0b\u548c\u89f8\u767c\u5668\u7684\u8f49\u63db\uff0c\u4ee5\u53ca\u67e5\u8a62\u8a9e\u6cd5\u7684\u8abf\u6574\uff0c\u7528\u6236\u53ef\u4ee5\u6709\u6548\u5730\u5728DB2\u4e2d\u91cd\u73feOracle\u7684\u529f\u80fd\u3002\u9019\u4e0d\u50c5\u6709\u52a9\u65bc\u6578\u64da\u9077\u79fb\uff0c\u9084\u80fd\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u9748\u6d3b\u6027\u548c\u53ef\u64f4\u5c55\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u7528\u6236\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u61c9\u7528\u90e8\u7f72\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4e91\u670d\u52d9\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5728DB2\u6578\u64da\u5eab\u4e2d\u5be6\u73feOracle\u529f\u80fd\u7684\u65b9\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\u8207\u6027\u80fd\uff0c\u6eff\u8db3\u696d\u52d9\u9700\u6c42\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-60877","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60877","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=60877"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60877\/revisions"}],"predecessor-version":[{"id":60878,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60877\/revisions\/60878"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60877"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60877"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60877"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}