你可以使用以下SQL查询将json_string字段转换为JSON类型,并提取name键的值: sql SELECT json_string, (json_string::json)->>'name' AS name FROM my_table; 或者,如果你更喜欢使用JSONB: sql SELECT json_string, (json_string::jsonb)->>'name' AS name FROM my_table; 这两个查询...
说明:Remove the longest string containing only the characters (a space by default) from the start/end/both ends of the string 去除尽可能长开始,结束或者两边的某类字符,默认为去除空白字符,当然可以自己指定,可同时指定多个要删除的字符串 例子: select trim(leading 'p' from 'pmars'); = "mars" 1...
│ - length (int): length of the output string ↵ │ - characters (text): possible characters to choose from ↵ │ ↵ │ Example: ↵ │ ↵ │ db=# SELECT generate_random_string(10); ↵ │ generate_random_string ↵ │ ────────────────────────...
docs;for(var docindocument){docs=doc;}returndocs!;}else{throw Exception("No file selected");}}Future<String>_readPDFandConvertToText()async{Filefile=File(_filepath!);List<int>bytes=await file.readAsBytes();final document=PdfDocument(inputBytes: Uint8List.fromList(bytes));String text=PdfTe...
declare base text;sqlstring text;i int;begin base='create table test_list_%s partition of test_list for values in (''%s'')';foriin0..9loop sqlstring=format(base,'flag'||i,'flag'||i);--raise notice'%',sqlstring;execute sqlstring;end loop;end ...
FieldName: string; Pair: TJSONPair; function CreateJSONValueForVariant(const aValue: Variant): TJSONValue; begin case VarType(aValue) of varInteger: Result := TJSONNumber.Create(Integer(aValue)); // 直接为整数创建TJSONNumber varSingle, varDouble: ...
future(); Future<String> future2 = Future.future(); vertx.eventBus().<Integer>send(AsyncClientVerticle.class.getName(),new JsonObject() .put("method","read").put("account","chen").put("password","123456"), ar ->{ if(ar.succeeded()){ context.assertEquals(ar.result().body(),...
new_value 期望插入/更新的json数据 create_missing:值为true:如果元素值不存在,则添加;false:元素值不存在,不添加 (默认为true) 另外我也试了jsonb_set仅针对某一key进行单独的更新操作是可以成功的 进过上面的四轮测试,大致可以得出结论:pgsql官方提供的||操作和jsonb_set函数仅支持单层json格式数据的更新,无法...
Avoid calling JSONB::toString in jOOQ internals #17578 Closed Member Author lukaseder commented Nov 7, 2024 Fixed in versions: 3.20.0 3.19.16 (PostgresUtils.toPGString() should use JSONB.data() not JSONB.toString() - Merge [#17579] #17581) 3.18.23 (PostgresUtils.toPGString() shoul...
List<ModelPolygon> exeNativeSql(@Param("sqlStr") String sqlStr); @Select({"${sqlStr}"}) List<ModelPolygon> exeNativeSql(@Param("sqlStr") String sqlStr); //"select gid as gid,name as name,ST_AsGeoJson(geom) as geom,code as code from wl_model_polygon" ...