{"id":62027,"date":"2024-10-13T15:36:15","date_gmt":"2024-10-13T07:36:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/62027\/"},"modified":"2024-10-13T15:36:15","modified_gmt":"2024-10-13T07:36:15","slug":"java%e5%af%a6%e7%8f%be%e9%ab%98%e6%95%88%e9%a0%bb%e7%b9%81%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%e5%ba%ab%e8%99%95%e7%90%86%e6%96%b9%e6%b3%95-java%e8%99%95%e7%90%86%e9%a0%bb%e7%b9%81%e4%bf%ae%e6%94%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/62027\/","title":{"rendered":"Java\u5be6\u73fe\u9ad8\u6548\u983b\u7e41\u4fee\u6539\u6578\u64da\u5eab\u8655\u7406\u65b9\u6cd5 (java\u8655\u7406\u983b\u7e41\u4fee\u6539\u6578\u64da\u5eab)"},"content":{"rendered":"

Java\u5be6\u73fe\u9ad8\u6548\u983b\u7e41\u4fee\u6539\u6578\u64da\u5eab\u8655\u7406\u65b9\u6cd5<\/h1>\n

\u5728\u73fe\u4ee3\u61c9\u7528\u7a0b\u5f0f\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u983b\u7e41\u4fee\u6539\u662f\u5e38\u898b\u7684\u9700\u6c42\uff0c\u5c24\u5176\u662f\u5728\u9ad8\u6d41\u91cf\u7684\u74b0\u5883\u4e2d\u3002Java\u4f5c\u70ba\u4e00\u7a2e\u5ee3\u6cdb\u4f7f\u7528\u7684\u7de8\u7a0b\u8a9e\u8a00\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u9ad8\u6548\u5730\u8655\u7406\u9019\u4e9b\u983b\u7e41\u7684\u6578\u64da\u5eab\u64cd\u4f5c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\u548c\u6280\u8853\uff0c\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5728Java\u4e2d\u5be6\u73fe\u9ad8\u6548\u7684\u6578\u64da\u5eab\u4fee\u6539\u3002<\/p>\n

1. \u4f7f\u7528\u9023\u63a5\u6c60<\/h2>\n

\u5728Java\u4e2d\uff0c\u6578\u64da\u5eab\u9023\u63a5\u7684\u5efa\u7acb\u548c\u95dc\u9589\u662f\u975e\u5e38\u8017\u6642\u7684\u64cd\u4f5c\u3002\u70ba\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u4f7f\u7528\u9023\u63a5\u6c60\u662f\u4e00\u500b\u6709\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u9023\u63a5\u6c60\u5141\u8a31\u61c9\u7528\u7a0b\u5f0f\u91cd\u8907\u4f7f\u7528\u5df2\u5efa\u7acb\u7684\u6578\u64da\u5eab\u9023\u63a5\uff0c\u5f9e\u800c\u6e1b\u5c11\u9023\u63a5\u7684\u958b\u92b7\u3002<\/p>\n

import javax.sql.DataSource;\nimport org.apache.commons.dbcp2.BasicDataSource;\n\npublic class DataSourceFactory {\n    private static BasicDataSource dataSource;\n\n    static {\n        dataSource = new BasicDataSource();\n        dataSource.setUrl(\"jdbc:mysql:\/\/localhost:3306\/mydb\");\n        dataSource.setUsername(\"user\");\n        dataSource.setPassword(\"password\");\n        dataSource.setInitialSize(5);\n        dataSource.setMaxTotal(10);\n    }\n\n    public static DataSource getDataSource() {\n        return dataSource;\n    }\n}\n<\/code><\/pre>\n
2. \u6279\u91cf\u8655\u7406<\/h2>\n
\u7576\u9700\u8981\u5c0d\u6578\u64da\u5eab\u9032\u884c\u591a\u6b21\u63d2\u5165\u6216\u66f4\u65b0\u64cd\u4f5c\u6642\uff0c\u4f7f\u7528\u6279\u91cf\u8655\u7406\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6027\u80fd\u3002Java\u7684JDBC API\u652f\u6301\u6279\u91cf\u64cd\u4f5c\uff0c\u9019\u6a23\u53ef\u4ee5\u5c07\u591a\u500bSQL\u8a9e\u53e5\u5408\u4f75\u70ba\u4e00\u500b\u8acb\u6c42\uff0c\u6e1b\u5c11\u8207\u6578\u64da\u5eab\u7684\u4ea4\u4e92\u6b21\u6578\u3002<\/p>\n
import java.sql.Connection;\nimport java.sql.PreparedStatement;\nimport java.sql.SQLException;\n\npublic class BatchUpdateExample {\n    public void batchUpdate(Connection connection, List dataList) throws SQLException {\n        String sql = \"INSERT INTO my_table (column1, column2) VALUES (?, ?)\";\n        try (PreparedStatement preparedStatement = connection.prepareStatement(sql)) {\n            for (MyData data : dataList) {\n                preparedStatement.setString(1, data.getColumn1());\n                preparedStatement.setString(2, data.getColumn2());\n                preparedStatement.addBatch();\n            }\n            preparedStatement.executeBatch();\n        }\n    }\n}\n<\/code><\/pre>\n
3. \u4f7f\u7528\u4e8b\u52d9\u7ba1\u7406<\/h2>\n
\u5728\u9032\u884c\u591a\u500b\u6578\u64da\u5eab\u64cd\u4f5c\u6642\uff0c\u4f7f\u7528\u4e8b\u52d9\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002Java\u7684JDBC API\u63d0\u4f9b\u4e86\u4e8b\u52d9\u7ba1\u7406\u7684\u529f\u80fd\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5728\u9700\u8981\u7684\u6642\u5019\u958b\u59cb\u3001\u63d0\u4ea4\u6216\u56de\u6efe\u4e8b\u52d9\u3002<\/p>\n
public void executeTransaction(Connection connection) throws SQLException {\n    try {\n        connection.setAutoCommit(false);\n        \n        \/\/ \u57f7\u884c\u591a\u500b\u6578\u64da\u5eab\u64cd\u4f5c\n        \/\/ ...\n\n        connection.commit();\n    } catch (SQLException e) {\n        connection.rollback();\n        throw e;\n    } finally {\n        connection.setAutoCommit(true);\n    }\n}\n<\/code><\/pre>\n
4. \u4f7f\u7528\u9069\u7576\u7684\u7d22\u5f15<\/h2>\n
\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u5c0d\u65bc\u983b\u7e41\u4fee\u6539\u7684\u6578\u64da\u8868\uff0c\u9069\u7576\u7684\u7d22\u5f15\u8a2d\u8a08\u53ef\u4ee5\u5e6b\u52a9\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\uff0c\u5f9e\u800c\u63d0\u9ad8\u6574\u9ad4\u6027\u80fd\u3002\u7136\u800c\uff0c\u904e\u591a\u7684\u7d22\u5f15\u6703\u5f71\u97ff\u63d2\u5165\u548c\u66f4\u65b0\u64cd\u4f5c\u7684\u6027\u80fd\uff0c\u56e0\u6b64\u9700\u8981\u6839\u64da\u5be6\u969b\u60c5\u6cc1\u9032\u884c\u5e73\u8861\u3002<\/p>\n
5. \u907f\u514d\u4e0d\u5fc5\u8981\u7684\u67e5\u8a62<\/h2>\n
\u5728\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\u6642\uff0c\u61c9\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u5728\u66f4\u65b0\u6578\u64da\u4e4b\u524d\uff0c\u53ef\u4ee5\u5148\u6aa2\u67e5\u6578\u64da\u662f\u5426\u9700\u8981\u66f4\u65b0\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u5eab\u4ea4\u4e92\u3002<\/p>\n
public void updateIfNeeded(Connection connection, MyData newData) throws SQLException {\n    String selectSql = \"SELECT * FROM my_table WHERE id = ?\";\n    try (PreparedStatement selectStmt = connection.prepareStatement(selectSql)) {\n        selectStmt.setInt(1, newData.getId());\n        ResultSet resultSet = selectStmt.executeQuery();\n        \n        if (resultSet.next()) {\n            \/\/ \u6aa2\u67e5\u6578\u64da\u662f\u5426\u9700\u8981\u66f4\u65b0\n            if (!resultSet.getString(\"column1\").equals(newData.getColumn1())) {\n                \/\/ \u57f7\u884c\u66f4\u65b0\u64cd\u4f5c\n                String updateSql = \"UPDATE my_table SET column1 = ? WHERE id = ?\";\n                try (PreparedStatement updateStmt = connection.prepareStatement(updateSql)) {\n                    updateStmt.setString(1, newData.getColumn1());\n                    updateStmt.setInt(2, newData.getId());\n                    updateStmt.executeUpdate();\n                }\n            }\n        }\n    }\n}\n<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u5728Java\u4e2d\u5be6\u73fe\u9ad8\u6548\u7684\u983b\u7e41\u6578\u64da\u5eab\u4fee\u6539\u9700\u8981\u8003\u616e\u591a\u500b\u56e0\u7d20\uff0c\u5305\u62ec\u4f7f\u7528\u9023\u63a5\u6c60\u3001\u6279\u91cf\u8655\u7406\u3001\u4e8b\u52d9\u7ba1\u7406\u3001\u9069\u7576\u7684\u7d22\u5f15\u8a2d\u8a08\u4ee5\u53ca\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u67e5\u8a62\u3002\u9019\u4e9b\u6280\u8853\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6027\u80fd\uff0c\u9084\u80fd\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u61c9\u7528\u7a0b\u5f0f\uff0c\u9078\u64c7\u5408\u9069\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u4f9b\u7a69\u5b9a\u7684\u904b\u884c\u74b0\u5883\u548c\u826f\u597d\u7684\u6027\u80fd\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22Java\u4e2d\u9ad8\u6548\u8655\u7406\u983b\u7e41\u6578\u64da\u5eab\u4fee\u6539\u7684\u65b9\u6cd5\uff0c\u63d0\u5347\u6027\u80fd\u8207\u7a69\u5b9a\u6027\uff0c\u78ba\u4fdd\u6578\u64da\u4e00\u81f4\u6027\u8207\u97ff\u61c9\u901f\u5ea6\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-62027","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62027","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=62027"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62027\/revisions"}],"predecessor-version":[{"id":62028,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62027\/revisions\/62028"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=62027"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=62027"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=62027"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}