| "use strict";(self.webpackChunkdoris_website=self.webpackChunkdoris_website||[]).push([[36957],{15680:(e,n,t)=>{t.d(n,{xA:()=>c,yg:()=>m});var r=t(296540);function o(e,n,t){return n in e?Object.defineProperty(e,n,{value:t,enumerable:!0,configurable:!0,writable:!0}):e[n]=t,e}function s(e,n){var t=Object.keys(e);if(Object.getOwnPropertySymbols){var r=Object.getOwnPropertySymbols(e);n&&(r=r.filter((function(n){return Object.getOwnPropertyDescriptor(e,n).enumerable}))),t.push.apply(t,r)}return t}function l(e){for(var n=1;n<arguments.length;n++){var t=null!=arguments[n]?arguments[n]:{};n%2?s(Object(t),!0).forEach((function(n){o(e,n,t[n])})):Object.getOwnPropertyDescriptors?Object.defineProperties(e,Object.getOwnPropertyDescriptors(t)):s(Object(t)).forEach((function(n){Object.defineProperty(e,n,Object.getOwnPropertyDescriptor(t,n))}))}return e}function a(e,n){if(null==e)return{};var t,r,o=function(e,n){if(null==e)return{};var t,r,o={},s=Object.keys(e);for(r=0;r<s.length;r++)t=s[r],n.indexOf(t)>=0||(o[t]=e[t]);return o}(e,n);if(Object.getOwnPropertySymbols){var s=Object.getOwnPropertySymbols(e);for(r=0;r<s.length;r++)t=s[r],n.indexOf(t)>=0||Object.prototype.propertyIsEnumerable.call(e,t)&&(o[t]=e[t])}return o}var i=r.createContext({}),u=function(e){var n=r.useContext(i),t=n;return e&&(t="function"==typeof e?e(n):l(l({},n),e)),t},c=function(e){var n=u(e.components);return r.createElement(i.Provider,{value:n},e.children)},p="mdxType",y={inlineCode:"code",wrapper:function(e){var n=e.children;return r.createElement(r.Fragment,{},n)}},g=r.forwardRef((function(e,n){var t=e.components,o=e.mdxType,s=e.originalType,i=e.parentName,c=a(e,["components","mdxType","originalType","parentName"]),p=u(t),g=o,m=p["".concat(i,".").concat(g)]||p[g]||y[g]||s;return t?r.createElement(m,l(l({ref:n},c),{},{components:t})):r.createElement(m,l({ref:n},c))}));function m(e,n){var t=arguments,o=n&&n.mdxType;if("string"==typeof e||o){var s=t.length,l=new Array(s);l[0]=g;var a={};for(var i in n)hasOwnProperty.call(n,i)&&(a[i]=n[i]);a.originalType=e,a[p]="string"==typeof e?e:o,l[1]=a;for(var u=2;u<s;u++)l[u]=t[u];return r.createElement.apply(null,l)}return r.createElement.apply(null,t)}g.displayName="MDXCreateElement"},569436:(e,n,t)=>{t.r(n),t.d(n,{assets:()=>i,contentTitle:()=>l,default:()=>y,frontMatter:()=>s,metadata:()=>a,toc:()=>u});var r=t(58168),o=(t(296540),t(15680));const s={title:"GET_JSON_STRING",language:"zh-CN"},l=void 0,a={unversionedId:"sql-manual/sql-functions/json-functions/get-json-string",id:"version-2.0/sql-manual/sql-functions/json-functions/get-json-string",title:"GET_JSON_STRING",description:"\x3c!--",source:"@site/i18n/zh-CN/docusaurus-plugin-content-docs/version-2.0/sql-manual/sql-functions/json-functions/get-json-string.md",sourceDirName:"sql-manual/sql-functions/json-functions",slug:"/sql-manual/sql-functions/json-functions/get-json-string",permalink:"/zh-CN/docs/2.0/sql-manual/sql-functions/json-functions/get-json-string",draft:!1,tags:[],version:"2.0",frontMatter:{title:"GET_JSON_STRING",language:"zh-CN"},sidebar:"docs",previous:{title:"GET_JSON_BIGINT",permalink:"/zh-CN/docs/2.0/sql-manual/sql-functions/json-functions/get-json-bigint"},next:{title:"JSON_INSERT",permalink:"/zh-CN/docs/2.0/sql-manual/sql-functions/json-functions/json-insert"}},i={},u=[{value:"get_json_string",id:"get_json_string",level:2},{value:"description",id:"description",level:3},{value:"Syntax",id:"syntax",level:4},{value:"example",id:"example",level:3},{value:"keywords",id:"keywords",level:3}],c={toc:u},p="wrapper";function y(e){let{components:n,...t}=e;return(0,o.yg)(p,(0,r.A)({},c,t,{components:n,mdxType:"MDXLayout"}),(0,o.yg)("h2",{id:"get_json_string"},"get_json_string"),(0,o.yg)("h3",{id:"description"},"description"),(0,o.yg)("h4",{id:"syntax"},"Syntax"),(0,o.yg)("p",null,(0,o.yg)("inlineCode",{parentName:"p"},"VARCHAR get_json_string(VARCHAR json_str, VARCHAR json_path)")),(0,o.yg)("p",null,"\u89e3\u6790\u5e76\u83b7\u53d6 json \u5b57\u7b26\u4e32\u5185\u6307\u5b9a\u8def\u5f84\u7684\u5b57\u7b26\u4e32\u5185\u5bb9\u3002\n\u5176\u4e2d json_path \u5fc5\u987b\u4ee5 $ \u7b26\u53f7\u4f5c\u4e3a\u5f00\u5934\uff0c\u4f7f\u7528 . \u4f5c\u4e3a\u8def\u5f84\u5206\u5272\u7b26\u3002\u5982\u679c\u8def\u5f84\u4e2d\u5305\u542b . \uff0c\u5219\u53ef\u4ee5\u4f7f\u7528\u53cc\u5f15\u53f7\u5305\u56f4\u3002\n\u4f7f\u7528 ","[ ]",' \u8868\u793a\u6570\u7ec4\u4e0b\u6807\uff0c\u4ece 0 \u5f00\u59cb\u3002\npath \u7684\u5185\u5bb9\u4e0d\u80fd\u5305\u542b ", ',"[ \u548c ]","\u3002\n\u5982\u679c json_string \u683c\u5f0f\u4e0d\u5bf9\uff0c\u6216 json_path \u683c\u5f0f\u4e0d\u5bf9\uff0c\u6216\u65e0\u6cd5\u627e\u5230\u5339\u914d\u9879\uff0c\u5219\u8fd4\u56de NULL\u3002"),(0,o.yg)("p",null,"\u53e6\u5916\uff0c\u63a8\u8350\u4f7f\u7528jsonb\u7c7b\u578b\u548cjsonb_extract_XXX\u51fd\u6570\u5b9e\u73b0\u540c\u6837\u7684\u529f\u80fd\u3002"),(0,o.yg)("p",null,"\u7279\u6b8a\u60c5\u51b5\u5904\u7406\u5982\u4e0b\uff1a"),(0,o.yg)("ul",null,(0,o.yg)("li",{parentName:"ul"},"\u5982\u679c json_path \u6307\u5b9a\u7684\u5b57\u6bb5\u5728JSON\u4e2d\u4e0d\u5b58\u5728\uff0c\u8fd4\u56deNULL"),(0,o.yg)("li",{parentName:"ul"},"\u5982\u679c json_path \u6307\u5b9a\u7684\u5b57\u6bb5\u5728JSON\u4e2d\u7684\u5b9e\u9645\u7c7b\u578b\u548cjson_extract_t\u6307\u5b9a\u7684\u7c7b\u578b\u4e0d\u4e00\u81f4\uff0c\u5982\u679c\u80fd\u65e0\u635f\u8f6c\u6362\u6210\u6307\u5b9a\u7c7b\u578b\u8fd4\u56de\u6307\u5b9a\u7c7b\u578bt\uff0c\u5982\u679c\u4e0d\u80fd\u5219\u8fd4\u56deNULL")),(0,o.yg)("h3",{id:"example"},"example"),(0,o.yg)("ol",null,(0,o.yg)("li",{parentName:"ol"},'\u83b7\u53d6 key \u4e3a "k1" \u7684 value')),(0,o.yg)("pre",null,(0,o.yg)("code",{parentName:"pre"},'mysql> SELECT get_json_string(\'{"k1":"v1", "k2":"v2"}\', "$.k1");\n+---------------------------------------------------+\n| get_json_string(\'{"k1":"v1", "k2":"v2"}\', \'$.k1\') |\n+---------------------------------------------------+\n| v1 |\n+---------------------------------------------------+\n')),(0,o.yg)("ol",{start:2},(0,o.yg)("li",{parentName:"ol"},'\u83b7\u53d6 key \u4e3a "my.key" \u7684\u6570\u7ec4\u4e2d\u7b2c\u4e8c\u4e2a\u5143\u7d20')),(0,o.yg)("pre",null,(0,o.yg)("code",{parentName:"pre"},'mysql> SELECT get_json_string(\'{"k1":"v1", "my.key":["e1", "e2", "e3"]}\', \'$."my.key"[1]\');\n+------------------------------------------------------------------------------+\n| get_json_string(\'{"k1":"v1", "my.key":["e1", "e2", "e3"]}\', \'$."my.key"[1]\') |\n+------------------------------------------------------------------------------+\n| e2 |\n+------------------------------------------------------------------------------+\n')),(0,o.yg)("ol",{start:3},(0,o.yg)("li",{parentName:"ol"},"\u83b7\u53d6\u4e8c\u7ea7\u8def\u5f84\u4e3a k1.key -> k2 \u7684\u6570\u7ec4\u4e2d\uff0c\u7b2c\u4e00\u4e2a\u5143\u7d20")),(0,o.yg)("pre",null,(0,o.yg)("code",{parentName:"pre"},'mysql> SELECT get_json_string(\'{"k1.key":{"k2":["v1", "v2"]}}\', \'$."k1.key".k2[0]\');\n+-----------------------------------------------------------------------+\n| get_json_string(\'{"k1.key":{"k2":["v1", "v2"]}}\', \'$."k1.key".k2[0]\') |\n+-----------------------------------------------------------------------+\n| v1 |\n+-----------------------------------------------------------------------+\n')),(0,o.yg)("ol",{start:4},(0,o.yg)("li",{parentName:"ol"},'\u83b7\u53d6\u6570\u7ec4\u4e2d\uff0ckey \u4e3a "k1" \u7684\u6240\u6709 value')),(0,o.yg)("pre",null,(0,o.yg)("code",{parentName:"pre"},'mysql> SELECT get_json_string(\'[{"k1":"v1"}, {"k2":"v2"}, {"k1":"v3"}, {"k1":"v4"}]\', \'$.k1\');\n+---------------------------------------------------------------------------------+\n| get_json_string(\'[{"k1":"v1"}, {"k2":"v2"}, {"k1":"v3"}, {"k1":"v4"}]\', \'$.k1\') |\n+---------------------------------------------------------------------------------+\n| ["v1","v3","v4"] |\n+---------------------------------------------------------------------------------+\n')),(0,o.yg)("h3",{id:"keywords"},"keywords"),(0,o.yg)("p",null,"GET_JSON_STRING,GET,JSON,STRING"))}y.isMDXComponent=!0}}]); |