{"id":207502,"date":"2025-07-08T09:33:12","date_gmt":"2025-07-08T01:33:12","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207502\/"},"modified":"2025-07-08T09:33:12","modified_gmt":"2025-07-08T01:33:12","slug":"go-sql%e6%9f%a5%e8%af%a2%e4%b8%8d%e4%b8%80%e8%87%b4","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207502\/","title":{"rendered":"Go SQL\u67e5\u8be2\u4e0d\u4e00\u81f4"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> Go SQL\u67e5\u8be2\u4e0d\u4e00\u81f4<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-23 09:30:37<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u54c8\u55bd\uff01\u5927\u5bb6\u597d\uff0c\u5f88\u9ad8\u5174\u53c8\u89c1\u9762\u4e86\uff0c\u6211\u662f\u7684\u4e00\u540d\u4f5c\u8005\uff0c\u4eca\u5929\u7531\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\u300aGo SQL\u67e5\u8be2\u4e0d\u4e00\u81f4\u300b<\/span>\uff0c\u672c\u6587\u4e3b\u8981\u4f1a\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u5927\u5bb6\u4e00\u8d77\u5b66\u4e60\u8fdb\u6b65\uff0c\u4e5f\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u3001\u70b9\u8d5e\u3001\u6536\u85cf\u3001\u8f6c\u53d1! \u4e0b\u9762\u5c31\u4e00\u8d77\u6765\u770b\u770b\u5427\uff01<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u5728\u6267\u884c\u67e5\u8be2\u65f6\uff0c\u6211\u9047\u5230\u4e86\u4e00\u4e9b\u975e\u5e38\u5947\u602a\u7684\u4e0d\u4e00\u81f4\u95ee\u9898\uff0c\u60f3\u77e5\u9053\u662f\u5426\u6709\u4eba\u77e5\u9053\u539f\u56e0\u3002<\/p>\n

\u5047\u8bbe\u6211\u6709\u4e00\u4e2a\u5b9a\u4e49\u5982\u4e0b\u7684\u7ed3\u6784\uff1a<\/p>\n

type result struct {\n    afield string      `db:\"a\"`\n    bfield interface{} `db:\"b\"`\n    cfield string      `db:\"c\"`\n    dfield string      `db:\"d\"`\n}<\/pre>\n
\u8fd8\u6709\u4e00\u4e2a\u5305\u542b\u4ee5\u4e0b\u5217\u7684 mysql \u8868\uff1a<\/p>\n
a : varchar(50)\nb : int\nc : varchar(50)\nd : varchar(50)<\/pre>\n
\u6211\u8981\u6267\u884c\u7684\u67e5\u8be2\uff1a<\/p>\n
 \u4ece\u8868\u4e2d\u9009\u62e9 a\u3001b\u3001c\u3001d\uff0c\u5176\u4e2d a=\u201ca\u201d <\/p>\n
\u7b2c\u4e00\u79cd\u6267\u884c\u65b9\u5f0f\uff1a<\/p>\n
db.get(&result, `select a, b, c, d from table where a=\"a\"`)<\/pre>\n
\u7b2c\u4e8c\u79cd\u6267\u884c\u65b9\u5f0f\uff1a<\/p>\n
db.get(&result, `select a, b, c, d from table where a=?`, \"a\")<\/pre>\n
\u6211\u9047\u5230\u7684\u4e0d\u4e00\u81f4\u4e4b\u5904\u5982\u4e0b\uff1a\u5f53\u4ee5\u7b2c\u4e00\u79cd\u65b9\u5f0f\u6267\u884c\u67e5\u8be2\u65f6\uff0cbfield\u7684\u7c7b\u578b\u662fint<\/code>\u3002\u4f46\u7b2c\u4e8c\u6b21\u6267\u884c\u67e5\u8be2\u65f6\uff0c\u5374\u662f[]uint8<\/code>\u3002<\/p>\n
\u4f8b\u5982\uff0c\u5f53 b \u4e3a 1 \u65f6\uff0c\u5c31\u4f1a\u51fa\u73b0\u6b64\u7ed3\u679c\u3002<\/p>\n
\u4e3a\u4ec0\u4e48 bfield \u7684\u7c7b\u578b\u4f1a\u6839\u636e\u67e5\u8be2\u7684\u6267\u884c\u65b9\u5f0f\u800c\u4e0d\u540c\uff1f<\/strong><\/p>\n
\u8fde\u63a5\u58f0\u660e\uff1a<\/p>\n
\/\/ Connection is an interface for making queries.\ntype Connection interface {\n    Exec(query string, args ...interface{}) (sql.Result, error)\n    Get(dest interface{}, query string, args ...interface{}) error\n    Select(dest interface{}, query string, args ...interface{}) error\n}<\/pre>\n
\u7f16\u8f91<\/strong><\/p>\n
\u4f7f\u7528 go \u6570\u636e\u5e93\/sql \u5305 + \u9a71\u52a8\u7a0b\u5e8f\u4e5f\u4f1a\u53d1\u751f\u8fd9\u79cd\u60c5\u51b5\u3002\u4e0b\u9762\u7684\u67e5\u8be2\u5206\u522b\u5c06 bfield<\/code> \u5206\u914d\u7ed9 []uint8<\/code> \u548c int64<\/code>\u3002<\/p>\n
 db \u7684\u7c7b\u578b\u4e3a *sql.db <\/p>\n
\u67e5\u8be2 1\uff1a<\/p>\n
db.queryrow(select a, b, c, d from table where a=\"a\").scan(&result.afield, &result.bfield, &result.cfield, &result.dfield)<\/code><\/p>\n
— > bfield<\/code> \u7684\u7c7b\u578b\u4e3a []uint8<\/code><\/p>\n
\u67e5\u8be22\uff1a<\/p>\n
db.queryrow(select a, b, c, d from table where a=?, \"a\").scan(&result.afield, &result.bfield, &result.cfield, &result.dfield)<\/code><\/p>\n
–> bfield<\/code> \u7684\u7c7b\u578b\u4e3a int64<\/code><\/p>\n
\u7f16\u8f91<\/strong><\/p>\n
\u8fd8\u6709\u4e00\u70b9\u9700\u8981\u6ce8\u610f\uff0c\u5f53\u94fe\u63a5\u591a\u4e2a where \u5b50\u53e5\u65f6\uff0c\u53ea\u8981\u4f7f\u7528 ?<\/code> \u586b\u5145\u81f3\u5c11<\/em> 1\uff0c\u67e5\u8be2\u5c31\u4f1a\u8fd4\u56de int<\/code>\u3002\u5426\u5219\uff0c\u5982\u679c\u5b83\u4eec\u90fd\u586b\u5145\u5728\u5b57\u7b26\u4e32\u4e2d\uff0c\u5b83\u5c06\u8fd4\u56de []uint8<\/code><\/p>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
\u7b80\u77ed\u56de\u7b54\uff1a\u56e0\u4e3a mysql \u9a71\u52a8\u7a0b\u5e8f\u5bf9\u5e26\u53c2\u6570\u548c\u4e0d\u5e26\u53c2\u6570\u7684\u67e5\u8be2\u4f7f\u7528\u4e0d\u540c\u7684\u534f\u8bae\u3002\u4f7f\u7528\u51c6\u5907\u597d\u7684\u8bed\u53e5\u53ef\u4ee5\u83b7\u5f97\u4e00\u81f4\u7684\u7ed3\u679c\u3002 <\/p>\n
\u4ee5\u4e0b\u89e3\u91ca\u53c2\u8003\u6807\u51c6mysql\u9a71\u52a8<\/p>\n
\u5728\u7b2c\u4e00\u79cd\u60c5\u51b5\u4e0b\uff0c\u9a71\u52a8\u7a0b\u5e8f\u5c06\u67e5\u8be2\u76f4\u63a5\u53d1\u9001\u5230 mysql\uff0c\u5e76\u5c06\u7ed3\u679c\u89e3\u91ca\u4e3a *textrows<\/code> \u7ed3\u6784\u3002\u8fd9\u4e2a\u7ed3\u6784\uff08\u51e0\u4e4e\uff09\u603b\u662f \uff0c\u5e76\u5c06\u5230\u66f4\u597d\u7c7b\u578b\u7684\u8f6c\u6362\u7559\u7ed9 go sql<\/code> \u5305\u3002\u5982\u679c\u76ee\u6807\u662f int<\/code>\u3001string<\/code>\u3001sql.scanner<\/code> \u7b49\uff0c\u5219\u6b64\u65b9\u6cd5\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\uff0c\u4f46\u4e0d\u9002\u7528\u4e8e interface{}<\/code>\u3002 <\/p>\n
\u5728\u7b2c\u4e8c\u79cd\u60c5\u51b5\u4e0b\uff0c\u3002\u8fd9\u4f1a\u5bfc\u81f4go sql\u5305\u4f7f\u7528preparedstatement\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cmysql \u9a71\u52a8\u7a0b\u5e8f\u4f7f\u7528 *binaryrows<\/code> \u7ed3\u6784\u6765\u89e3\u91ca\u7ed3\u679c\u3002 \uff0c\u5728\u672c\u4f8b\u4e2d\u5c06\u503c\u89e3\u7801\u4e3a int64<\/code>\u3002 <\/p>\n
\u6709\u8da3\u7684\u4e8b\u5b9e\uff1a\u5982\u679c\u60a8\u5411\u6570\u636e\u5e93 dsn \u63d0\u4f9b interpolateparams=true<\/code> \u53c2\u6570\uff08\u4f8b\u5982 \"root:testing@\/mysql?interpolateparams=true\"<\/code>\uff09\uff0cmysql \u9a71\u52a8\u7a0b\u5e8f\u5c06\u5728\u5ba2\u6237\u7aef\u51c6\u5907\u67e5\u8be2\uff0c\u800c\u4e0d\u662f\u4f7f\u7528preparedstatement\u3002\u6b64\u65f6\uff0c\u4e24\u79cd\u7c7b\u578b\u7684\u67e5\u8be2\u884c\u4e3a\u76f8\u540c\u3002 <\/p>\n
\u4e00\u4e2a\u5c0f\u7684\u6982\u5ff5\u8bc1\u660e\uff1a<\/p>\n
package main\n\nimport (\n    \"database\/sql\"\n    \"log\"\n\n    _ \"github.com\/go-sql-driver\/mysql\"\n)\n\ntype result struct {\n    afield string\n    bfield interface{}\n}\n\nfunc main() {\n    db, err := sql.open(\"mysql\", \"root:testing@\/mysql\")\n    if err != nil {\n        log.fatal(err)\n    }\n    defer db.close()\n\n    if _, err = db.exec(`create table if not exists mytable(a varchar(50), b int);`); err != nil {\n        log.fatal(err)\n    }\n    if _, err = db.exec(`delete from mytable`); err != nil {\n        log.fatal(err)\n    }\n    if _, err = db.exec(`insert into mytable(a, b) values ('a', 3)`); err != nil {\n        log.fatal(err)\n    }\n\n    var (\n        usingliteral         result\n        usingparam           result\n        usingliteralprepared result\n    )\n    row := db.queryrow(`select b from mytable where a='a'`)\n    if err := row.scan(&usingliteral.bfield); err != nil {\n        log.fatal(err)\n    }\n    row = db.queryrow(`select b from mytable where a=?`, \"a\")\n    if err := row.scan(&usingparam.bfield); err != nil {\n        log.fatal(err)\n    }\n    stmt, err := db.prepare(`select b from mytable where a='a'`)\n    if err != nil {\n        log.fatal(err)\n    }\n    defer stmt.close()\n    row = stmt.queryrow()\n    if err := row.scan(&usingliteralprepared.bfield); err != nil {\n        log.fatal(err)\n    }\n\n    log.printf(\"type when using literal:  %t\", usingliteral.bfield)         \/\/ []uint8\n    log.printf(\"type when using param:    %t\", usingparam.bfield)           \/\/ int64\n    log.printf(\"type when using prepared: %t\", usingliteralprepared.bfield) \/\/ int64\n}<\/pre>\n
mysql \u4e2d\u7684\u7b2c\u4e00\u4e2a sql \u5b57\u7b26\u4e32\u4e0d\u660e\u786e\uff0c\u5e76\u4e14\u53ef\u80fd\u5177\u6709\u8fc7\u591a\u542b\u4e49\uff0c\u5982 stackoverflow \u4e0a\u7684\u4ee5\u4e0b\u5730\u5740\u6240\u8ff0<\/p>\n<\/p>\n
\u6839\u636e sql-mode\uff0c\u60a8\u7684 sql \u547d\u4ee4\u53ef\u4ee5\u89e3\u91ca\u4e3a<\/p>\n
select a, b, c, d from table where a='a'<\/pre>\n
\u8fd9\u5c31\u662f\u6211\u8ba4\u4e3a\u4f60\u6240\u671f\u5f85\u7684\u3002<\/p>\n
\u6216\u4f5c\u4e3a<\/p>\n
SELECT A, B, C, D FROM table WHERE A=`a`<\/pre>\n
\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u6b67\u4e49\uff0c\u60a8\u53ef\u4ee5\u8fdb\u884c\u4e00\u4e2a\u65b0\u7684 first \u6d4b\u8bd5\uff0c\u7528\u5355\u5f15\u53f7\u66ff\u6362\u53cc\u5f15\u53f7\u5417\uff1f<\/p>\n
\u5982\u679c\u540c\u6837\u7684\u884c\u4e3a\u7ee7\u7eed\u5b58\u5728\uff0c\u6211\u7684\u56de\u7b54\u5c31\u4e0d\u662f\u4e00\u4e2a\u597d\u7684\u56de\u7b54\u3002<\/p>\n
\u5982\u679c\u4e24\u4e2a sql select \u8fd4\u56de\u76f8\u540c\u7684\u503c\uff0c\u5219\u60a8\u7684\u95ee\u9898\u5df2\u5f97\u5230\u89e3\u51b3\u3002 <\/p>\n
\u4f7f\u7528 ` \u5b57\u7b26\uff0c\u60a8\u53ef\u4ee5\u4f20\u9012\u53d8\u91cf\u540d\u79f0\u800c\u4e0d\u662f\u5b57\u7b26\u4e32\u503c\uff01<\/p>\n
\u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300aGo SQL\u67e5\u8be2\u4e0d\u4e00\u81f4\u300b\u7684\u4ecb\u7ecd\u5e94\u8be5\u8ba9\u4f60\u6536\u83b7\u591a\u591a\u4e86\u5427\uff01\u6b22\u8fce\u5927\u5bb6\u6536\u85cf\u6216\u5206\u4eab\u7ed9\u66f4\u591a\u9700\u8981\u5b66\u4e60\u7684\u670b\u53cb\u5427~\u516c\u4f17\u53f7\u4e5f\u4f1a\u53d1\u5e03Golang\u76f8\u5173\u77e5\u8bc6\uff0c\u5feb\u6765\u5173\u6ce8\u5427\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-207502","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207502","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=207502"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207502\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207502"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207502"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207502"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}