Dapper参数无法通过npgsql连接与PostgreSQL配合使用，是否支持postgres匿名函数参数化？

问题描述

我正在尝试使用dapper参数化我编写的用于执行upsert的postgres匿名函数。代码如下：

I'm trying to use dapper to parameterize a postgres anonymous function i've written to do an upsert. Here's the code:

private static int UpsertProductPrice(
        IDbConnection connection,
        Data.ProductPrice price,
        List<Data.ProductPriceTier> priceTiers)
    {
        string postgres = @"DO $$
        BEGIN 
        UPDATE product_price 
            SET start_date = @StartDate, end_date = @EndDate, price_tier_type = @PriceTierType
            WHERE product_price_external_id = @Id;
        IF found THEN
            RETURN;
        END IF;
        BEGIN
            INSERT INTO product_price(product_price_external_id, start_date, end_date, price_tier_type) 
            VALUES (@Id, @StartDate, @EndDate, @PriceTierType);
            RETURN;
        EXCEPTION WHEN unique_violation THEN END; END$$;";

        int productPriceId = connection.Execute(
            postgres,
            new { Id = price.product_price_external_id, StartDate = price.start_date, EndDate = price.end_date, PriceTierType = price.price_tier_type });

Postgres将查询记录为未参数化：仍然有@符号，未插入任何值。这是日志。

Postgres logs the query as unparameterized: there are still @ signs and no values were inserted. Here's the log.

2015-07-15 14:57:58.570 EDT,"user","TestDb",8496,"::1:53953",55a6ad36.2130,1,"DO",2015-07-15 14:57:58 EDT,9/42,0,ERROR,42703,"column ""startdate"" does not exist",,,"UPDATE product_price 

            SET start_date = @StartDate, end_date = @EndDate, price_tier_type = @PriceTierType

            WHERE product_price_external_id = @Id",52,"PL/pgSQL function inline_code_block line 3 at SQL statement","DO $$

        BEGIN 

        UPDATE product_price 

            SET start_date = @StartDate, end_date = @EndDate, price_tier_type = @PriceTierType

            WHERE product_price_external_id = @Id;

        IF found THEN

            RETURN;

        END IF;

        BEGIN

            INSERT INTO product_price(product_price_external_id, start_date, end_date, price_tier_type) 

            VALUES (@Id, @StartDate, @EndDate, @PriceTierType);

            RETURN;

        EXCEPTION WHEN unique_violation THEN END; END$$;",,,""

我做错了，还是这不支持？找不到任何人尝试在线进行此操作。

I'm I doing something wrong, or is this not supported? I couldn't find anyone trying to do this online.

推荐答案

不支持匿名代码块中的参数，这将是PostgreSQL功能而不是Npgsql功能。请参见此处的讨论：

Parameters in anonymous code blocks aren't supported, this would be a PostgreSQL feature rather than an Npgsql feature. See discussion here: https://github.com/npgsql/npgsql/issues/629

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