有了这个
create table departments_json (
department_id
integer
NOT NULL
CONSTRAINT departments_json__id__pk PRIMARY KEY,
department_data
CLOB
NOT NULL
CONSTRAINT departments_json__data__chk CHECK ( department_data IS JSON )
);
insert into departments_json
json values ( 110, '{
"department": "Accounting",
"employees": [
{
"name": "Higgins, Shelley",
"job": "Accounting Manager",
"hireDate": "2002-06-07T00:00:00"
},
{
"name": "Gietz, William",
"job": "Public Accountant",
"hireDate": "2002-06-07T00:00:00"
}
]
}'
);
以及新的 json :
{
"employees": [
{
"name": "Chen, John",
"job": "Accountant",
"hireDate": "2005-09-28T00:00:00"
},
{
"name": "Greenberg, Nancy",
"job": "Finance Manager",
"hireDate": "2002-08-17T00:00:00"
},
{
"name": "Urman, Jose Manuel",
"job": "Accountant",
"hireDate": "2006-03-07T00:00:00"
}
]
}
此后POST回复对我帮助很大。但现在是时候用新的 json 更新 Department_data 列了。我正在使用这个查询:
update departments_json d
set d.department_data =
WITH employees ( json ) AS (
SELECT j.json
FROM departments_json d
CROSS APPLY JSON_TABLE(
d.department_data,
'$.employees[*]'
COLUMNS (
json CLOB FORMAT JSON PATH '$'
)
) j
WHERE d.department_id = 110
UNION ALL
SELECT j.json
FROM JSON_TABLE(
'{
employees: [
{
name: Chen, John,
job: Accountant,
hireDate: 2005-09-28T00:00:00
},
{
name: Greenberg, Nancy,
job: Finance Manager,
hireDate: 2002-08-17T00:00:00
},
{
name: Urman, Jose Manuel,
job: Accountant,
hireDate: 2006-03-07T00:00:00
}
]
}',
'$.employees[*]'
COLUMNS (
json CLOB FORMAT JSON PATH '$'
)
) j
)JSON_MERGEPATCH(
d.department_data,
(
SELECT JSON_OBJECT(
KEY 'employees'
VALUE JSON_ARRAYAGG( json FORMAT JSON RETURNING CLOB )
FORMAT JSON
)
FROM employees
)
)
WHERE d.department_id = 110;
但是我遇到了这个错误，我不知道哪里出了问题
错误:
Error en la línea de comandos : 3 Columna : 5
Informe de error -
Error SQL: ORA-00936: falta una expresión
00936. 00000 - "missing expression"
*Cause:
*Action:
出了什么问题，我正在执行此步骤:LINK
注意:这就是我的表格的样子:
更新
应用 MP0 建议后，这就是我的查询的样子(两个选项)
但问题是我有这个错误:
ORA-40478: output value too large (maximum: 4000)
最佳答案
您可以使用:
UPDATE departments_json
SET department_data = JSON_MERGEPATCH(
department_data,
(
SELECT JSON_OBJECT(
KEY 'employees'
VALUE JSON_ARRAYAGG( json FORMAT JSON RETURNING CLOB )
FORMAT JSON RETURNING CLOB
)
FROM (
SELECT j.json
FROM departments_json d
CROSS APPLY JSON_TABLE(
d.department_data,
'$.employees[*]'
COLUMNS (
json CLOB FORMAT JSON PATH '$'
)
) j
WHERE d.department_id = 110
UNION ALL
SELECT j.json
FROM JSON_TABLE(
'{
"employees": [
{
"name": "Chen, John",
"job": "Accountant",
"hireDate": "2005-09-28T00:00:00"
},
{
"name": "Greenberg, Nancy",
"job": "Finance Manager",
"hireDate": "2002-08-17T00:00:00"
},
{
"name": "Urman, Jose Manuel",
"job": "Accountant",
"hireDate": "2006-03-07T00:00:00"
}
]
}',
'$.employees[*]'
COLUMNS (
json CLOB FORMAT JSON PATH '$'
)
) j
)
)
RETURNING CLOB
)
WHERE department_id = 110;
输出:
DEPARTMENT_ID | DEPARTMENT_DATA
------------: | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
110 | {"department":"Accounting","employees":[{"name":"Higgins, Shelley","job":"Accounting Manager","hireDate":"2002-06-07T00:00:00"},{"name":"Gietz, William","job":"Public Accountant","hireDate":"2002-06-07T00:00:00"},{"name":"Chen, John","job":"Accountant","hireDate":"2005-09-28T00:00:00"},{"name":"Greenberg, Nancy","job":"Finance Manager","hireDate":"2002-08-17T00:00:00"},{"name":"Urman, Jose Manuel","job":"Accountant","hireDate":"2006-03-07T00:00:00"}]}
db<> fiddle here
更新
您的代码有一些问题:
JSON_MERGEPATCH需要环绕WITH ... SELECT语句，因为该语句的输出应该是JSON_MERGEPATCH的第二个参数;和- 您的 JSON 无效，因为它缺少标识符和字符串周围的所有双引号。
如果你修复了这个问题，那么你的代码也将起作用:
update departments_json d
set d.department_data = JSON_MERGEPATCH(
d.department_data,
( -- Start of second argument of JSON_MERGEPATCH
WITH employees ( json ) AS (
SELECT j.json
FROM departments_json d
CROSS APPLY JSON_TABLE(
d.department_data,
'$.employees[*]'
COLUMNS (
json CLOB FORMAT JSON PATH '$'
)
) j
WHERE d.department_id = 110
UNION ALL
SELECT j.json
FROM JSON_TABLE(
'{
"employees": [
{
"name": "Chen, John",
"job": "Accountant",
"hireDate": "2005-09-28T00:00:00"
},
{
"name": "Greenberg, Nancy",
"job": "Finance Manager",
"hireDate": "2002-08-17T00:00:00"
},
{
"name": "Urman, Jose Manuel",
"job": "Accountant",
"hireDate": "2006-03-07T00:00:00"
}
]
}',
'$.employees[*]'
COLUMNS (
json CLOB FORMAT JSON PATH '$'
)
) j
)
SELECT JSON_OBJECT(
KEY 'employees'
VALUE JSON_ARRAYAGG( json FORMAT JSON RETURNING CLOB )
FORMAT JSON RETURNING CLOB
)
FROM employees
) -- End of second argument of JSON_MERGEPATCH
RETURNING CLOB
)
WHERE d.department_id = 110;
db<> fiddle here
关于sql - 使用 JSON_MERGPATCH 后更新 json 列，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/64388571/