json - Node Postgres 查询 json

Question

使用 node-pg 我正在尝试查找 JSON 对象中是否存在字符串。

示例(部分)行:

{ viq_id: '801583',
    title: 'Blank, security key, lock system, and production method',
    applicants: [ [Object], [Object] ],
    cpc: [ [Object], [Object] ],
    abstract: { value: [Object], language: 'en' } }

摘要是 JSONB 类型。 查询时

 var query = 'SELECT viq_id, title, applicants, cpc, abstract ->> "value"' +
    ' FROM epo_patents' +
    ' WHERE title ILIKE $1';

或者为了这个

var query = 'SELECT viq_id, title, applicants, cpc, abstract' +
        ' FROM epo_patents' +
        ' WHERE title ILIKE $1 OR abstract ->> "value" = $1';

或者为了这个

var query = 'SELECT viq_id, title, applicants, cpc, abstract' +
        ' FROM epo_patents' +
        ' WHERE abstract.value = $1';

答案是“errorMissingColumn”，或者在后一种情况下是 errorMissingRTE

如何在 Node pg 中正确查询 JSON？

Answer 1

将 var query = 'SELECT viq_id, title, applicants, cpc, abstract -> "value"' 更改为 var query = "SELECT viq_id, title, applicants, cpc, abstract ->> 'value'" ，因为双引号用于数据库对象(表、列等)名称... 看Postgres JSON syntax