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DesignTime.fs
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DesignTime.fs
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namespace FSharp.Data.SqlClient
open System
open System.Reflection
open System.Data
open System.Data.SqlClient
open Microsoft.FSharp.Quotations
open Microsoft.FSharp.Reflection
open ProviderImplementation.ProvidedTypes
open FSharp.Data
type internal ResultTypes = {
ProvidedType : Type
ErasedToType : Type
ProvidedRowType : ProvidedTypeDefinition option
ErasedToRowType : Type
RowMapping : Expr
} with
static member SingleTypeResult(provided, ?erasedTo) = {
ProvidedType = provided
ErasedToType = defaultArg erasedTo provided
ProvidedRowType = None
ErasedToRowType = typeof<unit>
RowMapping = Expr.Value Unchecked.defaultof<RowMapping>
}
type DesignTime private() =
static member internal AddGeneratedMethod
(sqlParameters: Parameter list, executeArgs: ProvidedParameter list, allParametersOptional, erasedType, providedOutputType, name) =
let mappedParamValues (exprArgs: Expr list) =
(exprArgs.Tail, sqlParameters)
||> List.map2 (fun expr info ->
let value =
if allParametersOptional && not info.TypeInfo.TableType
then
typeof<QuotationsFactory>
.GetMethod("OptionToObj", BindingFlags.NonPublic ||| BindingFlags.Static)
.MakeGenericMethod(info.TypeInfo.ClrType)
.Invoke(null, [| box expr|])
|> unbox
else
expr
<@@ (%%Expr.Value(info.Name) : string), %%Expr.Coerce(value, typeof<obj>) @@>
)
let m = ProvidedMethod(name, executeArgs, providedOutputType)
m.InvokeCode <- fun exprArgs ->
let methodInfo = typeof<ISqlCommand>.GetMethod(name)
let vals = mappedParamValues(exprArgs)
let paramValues = Expr.NewArray(typeof<string*obj>, elements = vals)
Expr.Call( Expr.Coerce(exprArgs.[0], erasedType), methodInfo, [paramValues])
m
static member internal GetRecordType(columns: Column list) =
columns
|> Seq.groupBy (fun x -> x.Name)
|> Seq.tryFind (fun (_, xs) -> Seq.length xs > 1)
|> Option.iter (fun (name, _) -> failwithf "Non-unique column name %s is illegal for ResultType.Records." name)
let recordType = ProvidedTypeDefinition("Record", baseType = Some typeof<obj>, HideObjectMethods = true)
let properties, ctorParameters =
[
for col in columns do
let propertyName = col.Name
if propertyName = "" then failwithf "Column #%i doesn't have name. Only columns with names accepted. Use explicit alias." col.Ordinal
let propType = col.ClrTypeConsideringNullable
let property = ProvidedProperty(propertyName, propType)
property.GetterCode <- fun args -> <@@ (unbox<DynamicRecord> %%args.[0]).[propertyName] @@>
let ctorParameter = ProvidedParameter(propertyName, propType)
yield property, ctorParameter
] |> List.unzip
recordType.AddMembers properties
let ctor = ProvidedConstructor(ctorParameters)
ctor.InvokeCode <- fun args ->
let pairs = Seq.zip args properties //Because we need original names in dictionary
|> Seq.map (fun (arg,p) -> <@@ (%%Expr.Value(p.Name):string), %%Expr.Coerce(arg, typeof<obj>) @@>)
|> List.ofSeq
<@@
let pairs : (string * obj) [] = %%Expr.NewArray(typeof<string * obj>, pairs)
DynamicRecord (dict pairs)
@@>
recordType.AddMember ctor
recordType
static member internal GetDataRowType (columns: Column list) =
let rowType = ProvidedTypeDefinition("Row", Some typeof<DataRow>)
columns |> List.map( fun col ->
let name = col.Name
if name = "" then failwithf "Column #%i doesn't have name. Only columns with names accepted. Use explicit alias." col.Ordinal
let propertyType = col.ClrTypeConsideringNullable
if col.IsNullable
then
let property = ProvidedProperty(name, propertyType, GetterCode = QuotationsFactory.GetBody("GetNullableValueFromDataRow", col.TypeInfo.ClrType, name))
if not col.ReadOnly
then property.SetterCode <- QuotationsFactory.GetBody("SetNullableValueInDataRow", col.TypeInfo.ClrType, name)
property
else
let property = ProvidedProperty(name, propertyType, GetterCode = (fun args -> <@@ (%%args.[0] : DataRow).[name] @@>))
if not col.ReadOnly
then property.SetterCode <- fun args -> <@@ (%%args.[0] : DataRow).[name] <- %%Expr.Coerce(args.[1], typeof<obj>) @@>
property
)
|> rowType.AddMembers
rowType
static member internal GetOutputTypes (outputColumns: Column list, resultType: ResultType, rank: ResultRank) =
if resultType = ResultType.DataReader
then
ResultTypes.SingleTypeResult typeof<SqlDataReader>
elif outputColumns.IsEmpty
then
ResultTypes.SingleTypeResult typeof<int>
elif resultType = ResultType.DataTable
then
let dataRowType = DesignTime.GetDataRowType outputColumns
{
ProvidedType = ProvidedTypeBuilder.MakeGenericType(typedefof<_ DataTable>, [ dataRowType ])
ErasedToType = typeof<DataTable<DataRow>>
ProvidedRowType = Some dataRowType
ErasedToRowType = typeof<unit>
RowMapping = Expr.Value Unchecked.defaultof<RowMapping>
}
else
let providedRowType, erasedToRowType, rowMapping =
if List.length outputColumns = 1
then
let column0 = outputColumns.Head
let t = column0.ClrTypeConsideringNullable
let values = Var("values", typeof<obj[]>)
let indexGet = Expr.Call(Expr.Var values, typeof<Array>.GetMethod("GetValue",[|typeof<int>|]), [Expr.Value 0])
None, t, Expr.Lambda(values, indexGet)
elif resultType = ResultType.Records
then
let r = DesignTime.GetRecordType outputColumns
let names = Expr.NewArray(typeof<string>, outputColumns |> List.map (fun x -> Expr.Value(x.Name)))
Some r,
typeof<obj>,
<@@ fun values -> let data = (%%names, values) ||> Array.zip |> dict in DynamicRecord( data) |> box @@>
else
let tupleType =
match outputColumns with
| [ x ] -> x.ClrTypeConsideringNullable
| xs -> FSharpType.MakeTupleType [| for x in xs -> x.ClrTypeConsideringNullable|]
let tupleTypeName = tupleType.AssemblyQualifiedName
None, tupleType, <@@ FSharpValue.PreComputeTupleConstructor (Type.GetType (tupleTypeName)) @@>
let nullsToOptions = QuotationsFactory.MapArrayNullableItems(outputColumns, "MapArrayObjItemToOption")
let combineWithNullsToOptions = typeof<QuotationsFactory>.GetMethod("GetMapperWithNullsToOptions")
let genericOutputType, erasedToType =
if rank = ResultRank.Sequence
then
Some( typedefof<_ seq>), typedefof<_ seq>.MakeGenericType([| erasedToRowType |])
elif rank = ResultRank.SingleRow
then
Some( typedefof<_ option>), typedefof<_ option>.MakeGenericType([| erasedToRowType |])
else //ResultRank.ScalarValue
None, erasedToRowType
{
ProvidedType =
if providedRowType.IsSome && genericOutputType.IsSome
then ProvidedTypeBuilder.MakeGenericType(genericOutputType.Value, [ providedRowType.Value ])
else erasedToType
ErasedToType = erasedToType
ProvidedRowType = providedRowType
ErasedToRowType = erasedToRowType
RowMapping = Expr.Call( combineWithNullsToOptions, [ nullsToOptions; rowMapping ])
}
static member internal GetOutputColumns (connection: SqlConnection, commandText, parameters: Parameter list, isStoredProcedure) =
try
connection.GetFullQualityColumnInfo(commandText)
with :? SqlException as why ->
try
let commandType = if isStoredProcedure then CommandType.StoredProcedure else CommandType.Text
connection.FallbackToSETFMONLY(commandText, commandType, parameters)
with :? SqlException ->
raise why
static member internal ExtractParameters(connection, commandText: string) = [
use cmd = new SqlCommand("sys.sp_describe_undeclared_parameters", connection, CommandType = CommandType.StoredProcedure)
cmd.Parameters.AddWithValue("@tsql", commandText) |> ignore
use reader = cmd.ExecuteReader()
while(reader.Read()) do
let paramName = string reader.["name"]
let sqlEngineTypeId = unbox<int> reader.["suggested_system_type_id"]
let userTypeId = reader |> SqlDataReader.getOption<int> "suggested_user_type_id"
let direction =
if unbox reader.["suggested_is_output"]
then
invalidArg paramName "Output parameters are not supported"
else
assert(unbox reader.["suggested_is_input"])
ParameterDirection.Input
let typeInfo = findTypeInfoBySqlEngineTypeId(connection.ConnectionString, sqlEngineTypeId, userTypeId)
yield {
Name = paramName
TypeInfo = typeInfo
Direction = direction
DefaultValue = None
}
]
static member internal GetExecuteArgs(cmdProvidedType: ProvidedTypeDefinition, sqlParameters: Parameter list, allParametersOptional, udtts: ProvidedTypeDefinition list) =
[
for p in sqlParameters do
assert p.Name.StartsWith("@")
let parameterName = p.Name.Substring 1
yield
if not p.TypeInfo.TableType
then
if allParametersOptional
then
ProvidedParameter(parameterName, parameterType = typedefof<_ option>.MakeGenericType( p.TypeInfo.ClrType) , optionalValue = null)
else
ProvidedParameter(parameterName, parameterType = p.TypeInfo.ClrType, ?optionalValue = p.DefaultValue)
else
assert(p.Direction = ParameterDirection.Input)
let userDefinedTableTypeRow =
match udtts |> List.tryFind (fun x -> x.Name = p.TypeInfo.UdttName) with
| Some x -> x
| None ->
let rowType = ProvidedTypeDefinition(p.TypeInfo.UdttName, Some typeof<obj>, HideObjectMethods = true)
cmdProvidedType.AddMember rowType
let parameters = [
for p in p.TypeInfo.TableTypeColumns ->
ProvidedParameter( p.Name, p.TypeInfo.ClrType, ?optionalValue = if p.IsNullable then Some null else None)
]
let ctor = ProvidedConstructor( parameters)
ctor.InvokeCode <- fun args -> Expr.NewArray(typeof<obj>, [for a in args -> Expr.Coerce(a, typeof<obj>)])
rowType.AddMember ctor
rowType
ProvidedParameter(
parameterName,
parameterType = ProvidedTypeBuilder.MakeGenericType(typedefof<_ seq>, [ userDefinedTableTypeRow ])
)
]