[英]Postgres | How to extract a value from JSON array that contains multiple JSON objects
I have a table that holds a column called additional_info
.我有一个表,其中包含一个名为
additional_info
的列。 this column contains a JSON object that looks like that:此列包含 JSON object,如下所示:
{
"dbSources": [{
"destIp": "10.10.10.29",
"serviceType": "PostgreSql",
"srcIp": "10.10.10.68",
"database": "xe",
"clusterMember": "",
"dbId": "PostgreSql_10.10.10.29",
"clusterName": "",
"host": "",
"dbUser": "system",
"osUser": "",
"userType": "Unknown",
"srcApp": ""
},{
"destIp": "10.10.10.29",
"serviceType": "PostgreSql",
"srcIp": "10.10.10.69",
"database": "xe1",
"clusterMember": "",
"dbId": "PostgreSql_10.10.10.29",
"clusterName": "",
"host": "",
"dbUser": "system",
"osUser": "",
"userType": "Unknown",
"srcApp": ""
}]
}
I want to extract (to select) the value of "database" where srcIp
equals 10.10.10.68
.我想提取(选择)“数据库”的值,其中
srcIp
等于10.10.10.68
。 meaning I want to extract the value "xe" from the first JSON object under the JSON array called dbSources
.这意味着我想从名为
dbSources
的 JSON 数组下的第一个 JSON object 中提取值“xe”。
The only thing that I could do is我唯一能做的就是
select additional_info::json ->'dbSources' as db from table
but how can I continue from there?但我怎样才能从那里继续呢?
You can do something like that:你可以这样做:
with query as (
select j->>'database' as db,j->>'srcIp' as src_ip from json_array_elements('{
"dbSources": [{
"destIp": "10.10.10.29",
"serviceType": "PostgreSql",
"srcIp": "10.10.10.68",
"database": "xe",
"clusterMember": "",
"dbId": "PostgreSql_10.10.10.29",
"clusterName": "",
"host": "",
"dbUser": "system",
"osUser": "",
"userType": "Unknown",
"srcApp": ""
},{
"destIp": "10.10.10.29",
"serviceType": "PostgreSql",
"srcIp": "10.10.10.69",
"database": "xe1",
"clusterMember": "",
"dbId": "PostgreSql_10.10.10.29",
"clusterName": "",
"host": "",
"dbUser": "system",
"osUser": "",
"userType": "Unknown",
"srcApp": ""
}]
}'::json->'dbSources') as j)
select db from query where src_ip = '10.10.10.68'
You can use a JSON path query:您可以使用 JSON 路径查询:
select jsonb_path_query_first(additional_info, '$.dbSources[*] ? (@.srcIp == "10.10.10.68").database')
from the_table
This assumes the column is of type jsonb
(which it should be).这假定该列的类型为
jsonb
(它应该是)。 If it's not, you need to cast it: additional_info::jsonb
如果不是,则需要转换它:
additional_info::jsonb
For a table with name table_name, this query will extract the value of database whose srcIp is '10.10.10.68'对于名为 table_name 的表,此查询将提取 srcIp 为 '10.10.10.68' 的数据库的值
SELECT obj::json#>'{database}' as db_name FROM edisondb.demo r, json_array_elements(r.some_text::json#>'{dbSources}') obj WHERE obj->>'srcIp' = '10.10.10.68';
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.