方式1: 指定数组数据类型 @DatapublicstaticclassSelfData{publicString[] series;publicJsonNodereport_rows; }publicvoid insertArrayTopostgres() {StringdataStr="{\"series\":[\"2024/06/18 00:00:00\"],\"rows\":[{\"sum\":[34517],\"values\":[[204],[132]],\"byValue\":[\"i am robot\...
(2 rows)(2 rows) 为防格式错误,你将获得一些类似一下的东西: postgres=# INSERT INTO rpg_items (data) VALUES ('{"name":"dummy","buy":"200","ppo"}'); ERROR: invalid input syntax for type json LINE 1: INSERT INTO rpg_items (data) VALUES ('{"name":"dummy","buy":...LINE 1: ...
%%sql-- PL/pgSQL code to create pivot tables with automatic column names-- prerequisite: install the tablefunc modulecreateextensionifnotexiststablefunc;-- tablename: name of source table you want to pivot-- rowc: the name of the column in source table you want to be the rows-- colc: ...
// 构建 JSON 对象 QJsonObject json; json.insert("Name", "Qt"); json.insert("From", 1991); json.insert...而在jsonArray中插入值的顺序与文件中的顺序是一致的,本身就是数组,自带下标(索引)。...插入值的代码: // 构建 Json 数组 - Version QJsonArray versionArray; versionArray.append(4.8)...
(res.rows); client.end(); }); // 使用to_json函数将查询结果转换为JSON格式 client.query("SELECT to_json(your_table) AS json_data FROM your_table", (err, res) => { if (err) throw err; console.log(res.rows); client.end(); }); // 使用array_agg函数将多行结果聚合为一个数组 ...
{"mary":2,"jimmy":43,"paulie":"asfasfasfd"} {"mary":3,"jimmy":435,"paulie":"ererere"} {"mary":6,"jimmy":43343,"paulie":"eresdfssfsfasfae"} {"mary":35,"jimmy":5,"paulie":"wrew\sdfsd"} {"mary":3,"jimmy":44545,"paulie":"\sdfs\\\sfs\\gf"} (5 rows) [pol@polhost ...
rows updated"- n_tup_del:usage: "COUNTER"description: "Number of rows deleted"- n_tup_hot_upd:usage: "COUNTER"description: "Number of rows HOT updated (i.e., with no separate index update required)"- n_live_tup:usage: "GAUGE"description: "Estimated number of live rows"- n_dead_...
Add the replication identity (the method of distinguishing between rows) for each table you want to replicate: ALTER TABLE tbl1 REPLICA IDENTITY DEFAULT; In rare cases, if your tables use data types that support TOAST or have very large field values, consider instead using replica identity type...
-> Seq Scan on tbl1 (cost=0.00..138750.17 rows=1 width=45) Filter: ((id = 1) AND (abs(mod(id, 4)) = 1)) (5 rows) 1. 2. 3. 4. 5. 6. 7. 8. 9. 这里应该是错误的,因为如果想利用constraint_exclusion来优化sql,where条件应该尽可能简单,尽量和check约束保持一致,不要转换类型,更...
Note:array_to_jsonandrow_to_jsonhave the same behavior asto_jsonexcept for offering a pretty-printing option. The behavior described forto_jsonlikewise applies to each individual value converted by the other JSON creation functions. Note:Thehstoreextension has a cast fromhstoretojson, so thath...