创建混合有单引号和双引号的粘合字符串

Question

我正在尝试使用其中混合有“单”和“双”glue引号的包创建一个字符串。R

作为代表，请考虑SQL我想要构建的以下类型的查询字符串：

CREATE TABLE fact_final_table AS 
(SELECT tab1.id,
    AVG(tab2."MV") FILTER (WHERE tab2.record_dt BETWEEN tab1.start_date::date - integer '7'
                                                      AND tab1.start_date::date - integer '1') AS "mv_avg_1w",
    AVG(tab2."MV") FILTER (WHERE tab2.record_dt BETWEEN tab1.start_date::date - integer '14'
                                                      AND tab1.start_date::date - integer '1') AS "mv_avg_2w"
FROM (SELECT id,
             start_date,
             point
      FROM base_tab
      WHERE mpfb.start_date::date >= '01-01-2000'::date) AS tab1
LEFT JOIN ghcnd_observations AS tab2
    ON (tab2.record_dt BETWEEN (tab1.start_date::date - integer '180')
                           AND (tab1.start_date::date - integer '1')
        AND ST_DWithin(tab1.point, tab2.location, 0.5))
GROUP BY tab1.id);

正如您所看到的，它是单引号和双引号的组合，按照上面的字面意思保留它们非常重要。例如，tab2."MV"有双引号，tab1.start_date::date - integer '7' AND tab1.start_date::date - integer '1'有单引号，需要按字面保留。

该字符串也需要使用参数构建。R我在using中尝试了以下操作glue，但无法使其工作。

var1       <- "MV"
var1_lowcase <- "mv"
lag_days   <- 180
var_date   <- as.Date("2000-01-01")
var_dwithin <- 0.5

glue::glue(
"CREATE TABLE fact_final_table AS 
(SELECT tab1.id,
    AVG(tab2."{var1}") FILTER (WHERE tab2.record_dt BETWEEN tab1.start_date::date - integer '7'
                           AND tab1.start_date::date - integer '1') AS "{var1_lowcase}_avg_1w",
    AVG(tab2."{var1}") FILTER (WHERE tab2.record_dt BETWEEN tab1.start_date::date - integer '14'
                           AND tab1.start_date::date - integer '1') AS "{var1_lowcase}_avg_2w"
    FROM (SELECT id,
          start_date,
          point
          FROM base_tab
          WHERE mpfb.start_date::date >= '{format(var_date, "%d-%m-%Y")}'::date) AS tab1
    LEFT JOIN ghcnd_observations AS tab2
    ON (tab2.record_dt BETWEEN (tab1.start_date::date - integer '{lag_days}')
        AND (tab1.start_date::date - integer '1')
        AND ST_DWithin(tab1.point, tab2.location, {var_dwithin}))
    GROUP BY tab1.id);")

不幸的是，由于单/双引号在glue::glue(...).

任何人都可以在这里提供帮助，以最小程度地破坏所需的输出字符串吗？我不确定这是否容易实现。我将不胜感激任何其他tidy方法，例如使用stringr，因为我希望这是%>%友好的。我简单地看了一下glue::glue_sql，但不知道如何在这里直接应用它。我很高兴能在这里学习如何在适用的情况下使用它。

Answer 1

因此，我从昨天开始更详细地研究了这一点，并且似乎确实glue具有使单引号和双引号显式显示的函数ieglue::single_quote()和 glue::double_quote()。

与 @ronakshah 的（有用的）响应类似，我管理了以下内容，更明确（为了代码可读性）：

var1       <- "MV"
var1_lowcase <- "mv"
lag_days   <- 180
var_date   <- as.Date("2000-01-01")
var_dwithin <- 0.5

glue::glue(
    "CREATE TABLE fact_final_table AS 
   (SELECT tab1.id,
   AVG(tab2.{glue::double_quote(var1)}) FILTER (WHERE tab2.record_dt BETWEEN tab1.start_date::date - integer '7'
   AND tab1.start_date::date - integer '1') AS {glue::double_quote(glue::glue({var1_lowcase},'_avg_1w'))},
   AVG(tab2.{glue::double_quote(var1)}) FILTER (WHERE tab2.record_dt BETWEEN tab1.start_date::date - integer '14'
   AND tab1.start_date::date - integer '1') AS {glue::double_quote(glue::glue({var1_lowcase},'_avg_2w'))}
   FROM (SELECT id,
         start_date,
          point
   FROM base_tab
    WHERE mpfb.start_date::date >= {glue::single_quote(format(var_date, '%d-%m-%Y'))}::date) 
  AS tab1
   LEFT JOIN ghcnd_observations AS tab2
   ON (tab2.record_dt BETWEEN (tab1.start_date::date - integer '{lag_days}')
   AND (tab1.start_date::date - integer '1')
   AND ST_DWithin(tab1.point, tab2.location, {var_dwithin}))
   GROUP BY tab1.id);")

它返回我需要的主字符串。希望这对有类似glue需求的其他人有所帮助。