{"id":68662,"date":"2025-05-16T10:01:16","date_gmt":"2025-05-16T02:01:16","guid":{"rendered":"https:\/\/fwq.ai\/blog\/?p=68662"},"modified":"2025-05-16T10:01:16","modified_gmt":"2025-05-16T02:01:16","slug":"%e4%b8%89%e7%a7%8d%e9%ab%98%e6%95%88sql%e5%a4%8d%e7%94%a8%e6%96%b9%e5%bc%8f%e5%ae%9e%e8%b7%b5%ef%bc%9a%e6%8f%90%e5%8d%87mybatis%e5%bc%80%e5%8f%91%e6%95%88%e7%8e%87%ef%bc%8c%e5%8a%a9%e5%8a%9b%e7%be%8e","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/68662\/","title":{"rendered":"\u4e09\u79cd\u9ad8\u6548SQL\u590d\u7528\u65b9\u5f0f\u5b9e\u8df5\uff1a\u63d0\u5347MyBatis\u5f00\u53d1\u6548\u7387\uff0c\u52a9\u529b\u7f8e\u56fd\u670d\u52a1\u5668\u90e8\u7f72\u4f18\u5316"},"content":{"rendered":"

\u5f15\u8a00<\/h2>\n

\u5728\u5b9e\u9645\u7684Java\u540e\u7aef\u5f00\u53d1\u8fc7\u7a0b\u4e2d\uff0cSQL\u7684\u590d\u7528\u4e0d\u4ec5\u80fd\u6709\u6548\u63d0\u5347\u5f00\u53d1\u6548\u7387\uff0c\u66f4\u5728\u590d\u6742\u9879\u76ee\u4e2d\u8d77\u5230\u4e86\u4ee3\u7801\u7edf\u4e00\u3001\u6613\u4e8e\u7ef4\u62a4\u7684\u91cd\u8981\u4f5c\u7528\u3002\u5c24\u5176\u662f\u5728\u4f7f\u7528MyBatis\u6846\u67b6\u65f6\uff0c\u901a\u8fc7\u5408\u7406\u7684SQL\u7ec4\u7ec7\u7ed3\u6784\uff0c\u53ef\u663e\u8457\u51cf\u5c11\u91cd\u590d\u6027\u4ee3\u7801\u5e76\u964d\u4f4e\u9519\u8bef\u7387\u3002\u672c\u6587\u5c06\u5206\u4eab\u4e09\u79cd\u5e38\u7528\u7684SQL\u590d\u7528\u65b9\u5f0f\uff0c\u7279\u522b\u9002\u5408\u90e8\u7f72\u4e8e\u9ad8\u6027\u80fd \u7f8e\u56fd\u670d\u52a1\u5668<\/strong> \u73af\u5883\u4e0b\u7684\u4e2d\u5927\u578b\u7cfb\u7edf\u67b6\u6784\u3002<\/p>\n

\n

\u4e00\u3001\u5229\u7528 MyBatis <sql><\/code> \u6807\u7b7e\u5b9e\u73b0\u5b57\u6bb5\u7247\u6bb5\u590d\u7528<\/h2>\n

MyBatis \u539f\u751f\u63d0\u4f9b\u4e86 <sql><\/code> \u6807\u7b7e\u7528\u4e8e\u62bd\u53d6\u516c\u5171SQL\u7247\u6bb5\uff0c\u7279\u522b\u9002\u5408\u5b57\u6bb5\u67e5\u8be2\u573a\u666f\u7684\u590d\u7528\u3002\u4f8b\u5982\uff0c\u5728\u7528\u6237\u6a21\u5757\u4e2d\u9891\u7e41\u4f7f\u7528\u7684\u5b57\u6bb5\u5982 id<\/code>\u3001username<\/code>\u3001email<\/code> \u7b49\u53ef\u4ee5\u901a\u8fc7\u5982\u4e0b\u65b9\u5f0f\u5c01\u88c5\uff1a<\/p>\n

<!-- \u516c\u5171\u5b57\u6bb5\u7247\u6bb5 -->\r\n<sql id=\"userBaseColumns\">\r\n    id, username, email, created_at, updated_at\r\n<\/sql>\r\n\r\n<!-- \u67e5\u8be2\u7528\u6237\u5217\u8868 -->\r\n<select id=\"selectUserList\" resultType=\"User\">\r\n    SELECT <include refid=\"userBaseColumns\"\/>\r\n    FROM users\r\n    WHERE status = #{status}\r\n<\/select>\r\n<\/code><\/pre>\n
\u8fd9\u79cd\u5199\u6cd5\u7684\u4f18\u70b9\u5728\u4e8e\uff0c\u4e00\u65e6\u5b57\u6bb5\u8c03\u6574\uff0c\u53ea\u9700\u4fee\u6539 <sql><\/code> \u6807\u7b7e\u4e2d\u7684\u5b9a\u4e49\u5373\u53ef\uff0c\u6240\u6709\u5f15\u7528\u5b83\u7684SQL\u90fd\u4f1a\u81ea\u52a8\u540c\u6b65\u66f4\u65b0\uff0c\u6781\u5927\u51cf\u5c11\u4e86\u7ef4\u62a4\u6210\u672c\u3002<\/p>\n
\u5bf9\u4e8e\u90e8\u7f72\u5728 \u7f8e\u56fdvps<\/strong> \u6216\u9ad8\u6027\u80fd \u7f8e\u56fd\u4e91\u670d\u52a1\u5668<\/strong> \u4e0a\u7684\u5e94\u7528\uff0c\u8fd9\u79cd\u65b9\u5f0f\u6709\u52a9\u4e8e\u5feb\u901f\u8fed\u4ee3SQL\u7ed3\u6784\uff0c\u9002\u5e94\u591a\u53d8\u7684\u4e1a\u52a1\u9700\u6c42\u3002<\/p>\n
\n
\u4e8c\u3001\u7ed3\u5408\u52a8\u6001SQL\u4e0eJava\u4ee3\u7801\u62fc\u63a5\u8fdb\u884c\u5206\u9875\u67e5\u8be2<\/h2>\n
SQL\u903b\u8f91\u5982\u679c\u6d89\u53ca\u5206\u9875\u3001\u6761\u4ef6\u8fc7\u6ee4\u7b49\u52a8\u6001\u53d8\u5316\uff0cMyBatis \u7684 <where><\/code> \u4e0e Java \u7684\u4ee3\u7801\u7ec4\u5408\u65b9\u5f0f\u4f1a\u66f4\u4e3a\u7075\u6d3b\u3002\u5982\u4e0b\u662f\u4e00\u4e2a\u5206\u9875\u5de5\u5177\u7c7b\u7684\u793a\u4f8b\uff1a<\/p>\n
public class PageHelper {\r\n    public static String appendPageSql(String sql, int pageNum, int pageSize) {\r\n        int offset = (pageNum - 1) * pageSize;\r\n        return sql + \" LIMIT \" + pageSize + \" OFFSET \" + offset;\r\n    }\r\n}\r\n<\/code><\/pre>\n
\u914d\u5408 SQL \u63d0\u4f9b\u7c7b\uff1a<\/p>\n
class UserSqlProvider {\r\n    public String getUserListSql(int status, int pageNum, int pageSize) {\r\n        String sql = \"SELECT id, username, email FROM users WHERE status = #{status}\";\r\n        return PageHelper.appendPageSql(sql, pageNum, pageSize);\r\n    }\r\n}\r\n<\/code><\/pre>\n
\u8be5\u65b9\u5f0f\u5728\u591a\u6761\u4ef6\u67e5\u8be2\u548c\u5206\u9875\u63a5\u53e3\u5f00\u53d1\u4e2d\u5c24\u4e3a\u5e38\u89c1\uff0c\u903b\u8f91\u6e05\u6670\uff0c\u9002\u914d\u6027\u5f3a\u3002\u90e8\u7f72\u5728\u9ad8\u5e76\u53d1\u8bbf\u95ee\u73af\u5883\u4e0b\u7684 \u7f8e\u56fd\u72ec\u7acb\u670d\u52a1\u5668<\/strong> \u4e0a\u65f6\uff0c\u80fd\u591f\u6709\u6548\u63a7\u5236SQL\u6548\u7387\u5e76\u964d\u4f4e\u8d44\u6e90\u6d88\u8017\u3002<\/p>\n
\n
\u4e09\u3001\u4f7f\u7528\u5e38\u91cf\u7c7b\u7edf\u4e00\u7ba1\u7406SQL\u8bed\u53e5<\/h2>\n
\u5bf9\u4e8e\u90e8\u5206\u4e0d\u4f9d\u8d56ORM\u6846\u67b6\u6216\u9700\u8981\u5feb\u901f\u5f00\u53d1\u7684\u9879\u76ee\uff0c\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7Java\u7c7b\u7ba1\u7406SQL\u7247\u6bb5\u3002\u8fd9\u79cd\u65b9\u5f0f\u7b80\u5355\u76f4\u89c2\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
public class SqlConstants {\r\n    public static final String USER_BASE_COLUMNS = \"id, username, email, created_at, updated_at\";\r\n    public static final String USER_TABLE = \"users\";\r\n    public static final String SELECT_USER_BY_ID = \r\n        \"SELECT \" + USER_BASE_COLUMNS + \" FROM \" + USER_TABLE + \" WHERE id = ?\";\r\n}\r\n<\/code><\/pre>\n
\u5728DAO\u5c42\u4f7f\u7528\uff1a<\/p>\n
public User getUserById(Long id) {\r\n    return jdbcTemplate.queryForObject(SqlConstants.SELECT_USER_BY_ID, new Object[]{id}, new UserRowMapper());\r\n}\r\n<\/code><\/pre>\n
\u867d\u7136\u8fd9\u79cd\u65b9\u5f0f\u7075\u6d3b\u6027\u7565\u4f4e\uff0c\u4f46\u5728\u5c0f\u578b\u7cfb\u7edf\u6216\u5355\u4f53\u67b6\u6784\u4e2d\uff0c\u8db3\u4ee5\u5e94\u5bf9\u57fa\u672c\u9700\u6c42\u3002\u5728\u521d\u671f\u9879\u76ee\u6d4b\u8bd5\u9636\u6bb5\uff0c\u7ed3\u5408\u00a0\u7f8e\u56fdvps<\/strong> \u8d44\u6e90\u90e8\u7f72\u6d4b\u8bd5\u63a5\u53e3\uff0c\u4e5f\u80fd\u83b7\u5f97\u826f\u597d\u7684\u54cd\u5e94\u6027\u80fd\u3002<\/p>\n
\n
\u4e3a\u4ec0\u4e48\u8981\u91cd\u89c6SQL\u590d\u7528\uff1f<\/h2>\n
\u65e0\u8bba\u662f\u4e2d\u5c0f\u578b\u9879\u76ee\u8fd8\u662f\u4f01\u4e1a\u7ea7\u7cfb\u7edf\uff0cSQL\u590d\u7528\u5e26\u6765\u7684\u597d\u5904\u4e0d\u5bb9\u5ffd\u89c6\uff1a<\/p>\n