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adam@6
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1 (** Common metaprogramming patterns for SQL syntax construction *)
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adam@6
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2
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adam@6
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3 val sqexps : env ::: {{Type}} -> fields ::: {Type} -> folder fields -> $(map sql_injectable fields)
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adam@6
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4 -> $fields -> $(map (sql_exp env [] []) fields)
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adam@6
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5 (* Convert a record of Ur values into a record of SQL expressions *)
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adam@6
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6
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adam@6
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7 val selector : tn :: Name -> fs ::: {Type} -> ofs ::: {Type} -> [fs ~ ofs]
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adam@6
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8 => folder fs -> $(map sql_injectable fs) -> $fs
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9 -> sql_exp [tn = ofs ++ fs] [] [] bool
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adam@6
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10 (* Build a boolean SQL expression expressing equality of some fields of a table
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11 * row with a record of Ur values *)
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adam@13
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12
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adam@13
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13 val joiner : tn1 :: Name -> tn2 :: Name -> fs ::: {Type} -> ofs1 ::: {Type} -> ofs2 ::: {Type}
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adam@13
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14 -> [[tn1] ~ [tn2]] => [fs ~ ofs1] => [fs ~ ofs2]
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adam@13
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15 => folder fs
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adam@13
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16 -> sql_exp [tn1 = ofs1 ++ fs, tn2 = ofs2 ++ fs] [] [] bool
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adam@13
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17 (* Declare equality of same-named columns from two tables. *)
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adam@15
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18
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19 val insertIfMissing : keyCols ::: {Type} -> otherCols ::: {Type} -> otherKeys ::: {{Unit}}
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adam@15
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20 -> [keyCols ~ otherCols] => [[Pkey] ~ otherKeys]
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adam@16
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21 => folder keyCols -> $(map sql_injectable keyCols)
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adam@16
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22 -> folder otherCols -> $(map sql_injectable otherCols)
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adam@16
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23 -> sql_table (keyCols ++ otherCols) ([Pkey = map (fn _ => ()) keyCols] ++ otherKeys)
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24 -> $(keyCols ++ otherCols)
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25 -> transaction bool
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adam@15
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26 (* Insert a row into an SQL table if its key isn't already present, returning [False] iff the key was already present *)
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27
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28 val deleteByKey : keyCols ::: {Type} -> otherCols ::: {Type} -> otherKeys ::: {{Unit}}
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29 -> [keyCols ~ otherCols] => [[Pkey] ~ otherKeys]
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adam@16
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30 => folder keyCols -> $(map sql_injectable keyCols)
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adam@16
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31 -> sql_table (keyCols ++ otherCols) ([Pkey = map (fn _ => ()) keyCols] ++ otherKeys)
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adam@16
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32 -> $keyCols
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adam@15
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33 -> transaction {}
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adam@15
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34 (* Delete a row from a table by matching its primary key against a given record. *)
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