绑定消息提供 3 个参数，但准备语句“”需要 0 [Node js，pg]

Question

我想像这样将参数传递给我的 pg 查询：

    await client.query("DO\n" +
    "$do$\n" +
    "DECLARE\n" +
    "  _db TEXT := ;\n" +
    "  _user TEXT := ;\n" +
    "  _password TEXT := ;\n" +
    "BEGIN\n" +
    "  CREATE EXTENSION IF NOT EXISTS dblink; -- enable extension \n" +
    "  IF EXISTS (SELECT 1 FROM pg_database WHERE datname = _db) THEN\n" +
    "    RAISE NOTICE 'Database already exists';\n" +
    "  ELSE\n" +
    "    PERFORM dblink_connect('host=localhost user=' || _user || ' password=' || _password || ' dbname=' || current_database());\n" +
    "    PERFORM dblink_exec('CREATE DATABASE ' || _db);\n" +
    "  END IF;\n" +
    "END\n" +
    "$do$", [process.env.database, process.env.user, process.env.password]);

但我得到 bind message supplies 3 parameters, but prepared statement "" requires 0。如果我不传递参数数组，我会得到 there is no parameter 错误。

那么如何将参数传递给我的查询？

Answer 1

根据文档 here，最重要的问题是匿名函数 DO 不接受参数。这意味着提供的参数 [process.env.database, process.env.user, process.env.password] 无处可去，因为 $* 占位符被埋在函数中。

绑定消息提供 3 个参数，但准备语句“”需要 0 [Node js，pg]

bind message supplies 3 parameters, but prepared statement "" requires 0 [Node js, pg]

sql

postgresql

node.js

pg

node-postgres