如何使用node-postgres设置架构 [英] How to set schema with node-postgres

问题描述

我正在尝试使用DOCUMENT 的架构 rel = nofollow noreferrer> node-postgres 。

I'm trying to query against a schema called DOCUMENT in my postgres db using node-postgres.

我似乎无法使查询针对指定的架构运行。

I can't seem to get a query to run against the specified schema.

此查询使用psql直接针对postgres运行很好

This query runs fine directly against postgres using psql

SELECT * FROM "DOCUMENT".document_metadata m 
LEFT OUTER JOIN "DOCUMENT".document_attributes a 
ON a.document_id = m.id

此代码会产生以下错误

const query = `SELECT * FROM "DOCUMENT".document_metadata m 
               LEFT OUTER JOIN "DOCUMENT".document_attributes a 
               ON a.document_id = m.id`
const metadata = await db.query(query)

错误

error: relation "DOCUMENT.document_metadata" does not exist
    at Connection.parseE (/usr/src/app/node_modules/pg/lib/connection.js:602:11)
    at Connection.parseMessage (/usr/src/app/node_modules/pg/lib/connection.js:399:19)
    at Socket.<anonymous> (/usr/src/app/node_modules/pg/lib/connection.js:121:22)
    at Socket.emit (events.js:189:13)
    at addChunk (_stream_readable.js:284:12)
    at readableAddChunk (_stream_readable.js:265:11)
    at Socket.Readable.push (_stream_readable.js:220:10)
    at TCP.onStreamRead [as onread] (internal/stream_base_commons.js:94:17)

我也尝试过

const query = `SET search_path TO 'DOCUMENT';
               SELECT * FROM document_metadata m 
               LEFT OUTER JOIN document_attributes a 
               ON a.document_id = m.id;`

const metadata = await db.query(query)

会产生错误

error: relation "document_metadata" does not exist
    at Connection.parseE (/usr/src/app/node_modules/pg/lib/connection.js:602:11)
    at Connection.parseMessage (/usr/src/app/node_modules/pg/lib/connection.js:399:19)
    at Socket.<anonymous> (/usr/src/app/node_modules/pg/lib/connection.js:121:22)
    at Socket.emit (events.js:189:13)
    at addChunk (_stream_readable.js:284:12)
    at readableAddChunk (_stream_readable.js:265:11)
    at Socket.Readable.push (_stream_readable.js:220:10)
    at TCP.onStreamRead [as onread] (internal/stream_base_commons.js:94:17)

更新
当我直接在psql中运行这些相同的查询时，我看到带有表名的10行。当我通过节点代码运行此命令时，我看不到任何行：

Update When I run these same queries directly in psql I see like 10 rows with table names. When I run this through my node code I see no rows:

const metadata4 = await db.query('SHOW search_path;')
console.log('search_path after setting = ', metadata4.rows) // prints [ { search_path: '"DOCUMENT"' } ]

const tables = await db.query(`SELECT * FROM information_schema.tables where table_schema = 'DOCUMENT';`)
console.log('tables = ', tables.rows) // prints []

推荐答案

只需在单独的行中执行：

just execute in a separated line:

db.query("SET search_path TO 'DOCUMENT';")

DOCUMENT是架构的名称，然后执行常规查询：

DOCUMENT is the name of your schema, then execute the normal query:

const query = `SELECT * FROM document_metadata m 
               LEFT OUTER JOIN document_attributes a 
               ON a.document_id = m.id;`

db.query(query)

这篇关于如何使用node-postgres设置架构的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！