JSON_OBJECT函数将逗号分隔的键值对列表转换为JSON中的对象成员。 JSON_OBJECTAGG聚合函数 JSON_OBJECTAGG聚合函数创建一个JSON对象,其中包含通过聚合每行中的键值对形成的对象成员列表。 JSON_ARRAY函数 JSON_ARRAY函数将以逗号分隔的表达式列表转换为JSON数组。 JSON_ARRAYAGG聚合函数 JSON_ARRAYAGG聚合函数类似于LISTAGG...
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select ID, json_value(json_field, '$.Code') from json_table where ID=390; select ID, json_value(json_field, '$.Time') from json_table where ID=390; 两条语句均只返回一条记录。 2 使用count(*)时,查询结果始终正确: create or replace view json_view as select ID, json_value(json_fie...
JSON 复制 { "name": "OracleDataset", "properties": { "type": "OracleTable", "schema": [], "typeProperties": { "schema": "<schema_name>", "table": "<table_name>" }, "linkedServiceName": { "referenceName": "<Oracle linked service name>", "type": "LinkedServiceReference" }...
Example 21-1 Using JSON_SERIALIZE To Convert BLOB Data To Pretty-Printed Text This example serializes and pretty-prints the JSON purchase order that has1600as the value of fieldPONumberdata, which is selected from columnpo_documentof tablej_purchaseorderThe return-value data type isVARCHAR2(4000...
oracle.jdbc.driver.OracleCallableStatement call = (oracle.jdbc.driver.OracleCallableStatement) conn.prepareCall ("declare x ref point; " + "begin insert into point_values_table p values (point(10, 20))" + " returning ref(p) into x; " + " ? := x; " + "end;"); call....
# 注意,如果只迁移schema,在配置object时,不能将table和schema同时写,否则检查时会报如下错误: [omm@opensource-db mtk_2.9.2_linux_amd64]$ ./mtk check-config -c ora2gaussdb/config/mtk.json --preRun use config : ora2gaussdb/config/mtk.json Error : schema and tables cannot exist together schem...
create table bigtab (mycol varchar2(20));begin for i in 1..20000 loop insert into bigtab (mycol) values (dbms_random.string('A',20)); end loop;end;/show errorscommit; 在终端窗口中,使用 SQL*Plus 运行该脚本: sqlplus pythonhol/welcome@127.0.0.1/orcl@query_arraysize exit . 查看$HOME...
CREATE TABLE JSONTable ( DocumentIdentifier INT NOT NULL PRIMARY KEY, JSONDocument JSON); MySQL 5.7.22 also added the JSON utility functionJSON_PRETTY()which outputs an existing JSON value in an easy-to-read format; each JSON object member or array value is printed on a separate...
在Oracle中将JSON数组转换为关系数据您已经进入了外部路径为$.items[*]的数组。从那里开始，数组元素位于...