WIP on PG Query.whereByFIelds

src/Common/Library.fs

@@ -98,6 +98,15 @@ type Field = {
         { this with Qualifier = Some alias }
 
 
+/// How fields should be matched
+[<Struct>]
+type FieldMatch =
+    /// Any field matches (OR)
+    | Any
+    /// All fields match (AND)
+    | All
+
+
 /// The required document serialization implementation
 type IDocumentSerializer =
     

src/Postgres/Library.fs

@@ -109,24 +109,46 @@ module Parameters =
 [<RequireQualifiedAccess>]
 module Query =
     
+    /// Create a WHERE clause fragment to implement a comparison on fields in a JSON document
+    [<CompiledName "WhereByFields">]
+    let whereByFields fields howMatched =
+        let mutable idx = 0
+        let nameField () =
+            let name = $"field{idx}"
+            idx <- idx + 1
+            name
+        fields
+        |> List.map (fun it ->
+            let fieldName = it.Qualifier |> Option.map (fun q -> $"{q}.data") |> Option.defaultValue "data"
+            let jsonPath  =
+                if it.Name.Contains '.' then "#>>'{" + String.concat "," (it.Name.Split '.') + "}'"
+                else $"->>'{it.Name}'"
+            let column = fieldName + jsonPath
+            match it.Op with
+            | EX | NEX -> $"{column} {it.Op}"
+            | BT ->
+                let p      = defaultArg it.ParameterName (nameField ())
+                let names  = $"{p}min AND {p}max"
+                let values = it.Value :?> obj list
+                match values[0] with
+                | :? int8    | :? uint8  | :? int16  | :? uint16 | :? int | :? uint32 | :? int64 | :? uint64
+                | :? decimal | :? single | :? double -> $"({column})::numeric {it.Op} {names}"
+                | _ -> $"{column} {it.Op} {names}"
+            | _ ->
+                let p = defaultArg it.ParameterName (nameField ())
+                $"{column} {it.Op} {p}")
+        |> String.concat (match howMatched with Any -> " OR " | All -> " AND ")
+    
     /// Create a WHERE clause fragment to implement a comparison on a field in a JSON document
     [<CompiledName "WhereByField">]
+    //[<Obsolete "Use whereByFields / WhereByFields instead">]
     let whereByField field paramName =
-        match field.Op with
+        whereByFields [ { field with ParameterName = Some paramName } ] Any
-        | EX | NEX -> $"data->>'{field.Name}' {field.Op}"
-        | BT ->
-            let names  = $"{paramName}min AND {paramName}max"
-            let values = field.Value :?> obj list
-            match values[0] with
-            | :? int8    | :? uint8  | :? int16  | :? uint16 | :? int | :? uint32 | :? int64 | :? uint64
-            | :? decimal | :? single | :? double -> $"(data->>'{field.Name}')::numeric {field.Op} {names}"
-            | _ -> $"data->>'{field.Name}' {field.Op} {names}"
-        | _ -> $"data->>'{field.Name}' {field.Op} %s{paramName}"
     
     /// Create a WHERE clause fragment to implement an ID-based query
     [<CompiledName "WhereById">]
     let whereById paramName =
-        whereByField (Field.EQ (Configuration.idField ()) 0) paramName
+        whereByFields [ { Field.EQ (Configuration.idField ()) 0 with ParameterName = Some paramName } ] Any
     
     /// Table and index definition queries
     module Definition =

src/Tests/CommonTests.fs

@@ -115,9 +115,9 @@ let all =
                 Expect.equal "@name" field.ParameterName.Value "The parameter name is incorrect"
             }
             test "WithQualifier succeeds" {
-                let field = (Field.EQ "Bill" "Matt").WithParameterName "@joe"
+                let field = (Field.EQ "Bill" "Matt").WithQualifier "joe"
                 Expect.isSome field.Qualifier "The table qualifier should have been filled"
-                Expect.equal "@joe" field.Qualifier.Value "The table qualifier is incorrect"
+                Expect.equal "joe" field.Qualifier.Value "The table qualifier is incorrect"
             }
         ]
         testList "Query" [