"INSERT has more target columns than expressions" 在 PL/pgSQL 函数中

Question

我正在创建一个函数并将其与长生不老药一起使用。我正在执行该函数并将其解析为下面的 JSON 有效负载：

有效负载包含 table 的键值对，函数应该插入一条记录，稍后我想重构以首先通过 ID 获取 table，然后使用格式化插入语句我在表格 table.

中得到的模式

这是我正在执行的函数：

    CREATE OR REPLACE FUNCTION create_record(data json) returns text
    language plpgsql
    as
    $$
    declare
    table_id    uuid      := gen_random_uuid();
    id          uuid      := gen_random_uuid()::uuid;
    inserted_at timestamp := NOW()::timestamp(0);
    updated_at  timestamp := NOW()::timestamp(0);
    columns     text;
    values      text;
    j           jsonb;
    v           text;
    statement   text;
    n         integer := 0;
    length    integer := json_array_length(data -> 'schema');
    begin
    for j in (select json_array_elements(data -> 'schema')::jsonb) loop
        if n < length - 1 then
            columns := concat(columns, j ->> 'key', ',',' ');
            values := concat(values, j ->> 'value', ',',' ');
        else
            columns := concat(columns, j ->> 'key');
            values := concat(values, j ->> 'value');
        end if;
        n := n + 1;
    end loop;
    columns :=concat('id',',',' ','inserted_at',',', ' ', 'updated_at', ',', ' ', columns);
    values :=concat(id,',',' ',inserted_at,',', ' ', updated_at, ',', ' ', values);
    RAISE NOTICE 'cols: (%)', columns;
    RAISE NOTICE 'vals: (%)', values;
    statement := format('INSERT INTO %I (%s) VALUES (%L) RETURNING id;', data ->> 'name', columns, values);
    execute (statement);
    exception
    when others then
        return format('{"error": "%L"}', SQLERRM);
    end

    $$;

这是我要发送的负载：

{
    "action": "create",
    "body": {
        "id": "2ed27f13-62d1-48dc-bbd3-0a031fe2712e",
        "name": "test1",
        "parent": "base",
        "schema": [
            {
                "key": "hello",
                "value": "some"
            },
            {
                "key": "world",
                "value": "some"
            },
            {
                "key": "test",
                "value": "some"
            }
        ]
    }
}

这是我收到的错误：

%Postgrex.Result{
   columns: ["create_record"],
   command: :select,
   connection_id: 1718,
   messages: [
     %{
       code: "00000",
       file: "pl_exec.c",
       line: "3859",
       message: "vals: (62d2364b-9add-4c85-b964-45d6b86d7db7, 2022-01-30 20:45:53, 2022-01-30 20:45:53, some, some, some)",
       routine: "exec_stmt_raise",
       severity: "NOTICE",
       unknown: "NOTICE",
       where: "PL/pgSQL function create_record(json) line 28 at RAISE"
     },
     %{
       code: "00000",
       file: "pl_exec.c",
       line: "3859",
       message: "cols: (id, inserted_at, updated_at, hello, world, test)",
       routine: "exec_stmt_raise",
       severity: "NOTICE",
       unknown: "NOTICE",
       where: "PL/pgSQL function create_record(json) line 27 at RAISE"
     }
   ],
   num_rows: 1,
   rows: [
     ["{\"error\": \"'INSERT has more target columns than expressions'\"}"]
   ]
 }}

令我感到困惑的是，列数似乎与值完全相同，但是，我似乎遇到了这个错误 INSERT has more target columns than expressions。

Answer 1

就像@lukStorms 在上面所说的那样，值需要文字字符串我用 quote_literal(j ->> 'value') 解决了我从中提取的 json 值的问题jsonb

"INSERT has more target columns than expressions" 在 PL/pgSQL 函数中

"INSERT has more target columns than expressions" in PL/pgSQL function

postgresql

elixir