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module SQLCascadeTriggers =
    open FSharp.Data

    let [<Literal>] ConnectionString  = @"Data Source=DBSERVER;Initial Catalog=DB;UID=xxx;PWD=xxx;"

    let generateTriggers filter =
        use cmd = new SqlCommandProvider<"""
    SELECT   PKSchema = PK.table_schema, PKTable = PK.table_name
           , FKSchema = FK.table_schema, FKTable = FK.table_name
           , PK.ordinal_position
           , PKColumn = PK.column_name
           , FKColumn = FK.column_name
           , RC.*
    FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS RC
    JOIN INFORMATION_SCHEMA.key_column_usage        PK ON PK.constraint_catalog = RC.unique_constraint_catalog AND PK.constraint_schema = RC.unique_constraint_schema AND PK.constraint_name = RC.unique_constraint_name
    JOIN INFORMATION_SCHEMA.key_column_usage        FK ON FK.constraint_catalog = RC.constraint_catalog        AND FK.constraint_schema = RC.constraint_schema        AND FK.constraint_name = RC.constraint_name         AND FK.ordinal_position = PK.ordinal_position
    ORDER BY 1, 2, 3, 4, 5
""" , ConnectionString, ResultType = ResultType.Records>(ConnectionString)

        
        let filteredRows = 
            cmd.Execute()
            |> Seq.filter filter
            |> Seq.cache

        let depths =
            filteredRows
            |> Seq.map(fun row -> (row.PKSchema.Value, row.PKTable), (row.FKSchema.Value, row.FKTable))
            |> Seq.distinct
            |> (fun rows ->
                let rec level table =
                    rows 
                    |> Seq.filter(fun (p, ch) -> ch = table)
                    |> Seq.map     fst
                    |> Seq.map (level >> (+) 1)
                    |> function 
                    | s when Seq.isEmpty s -> 0
                    | s -> Seq.max s
                rows
                |> Seq.map snd
                |> Seq.distinct 
                |> Seq.map (fun ch -> ch, level ch)
            )
            |> Map
        let getDepth t = depths |> Map.tryFind t |> Option.defaultValue 0

        filteredRows
        //|> Seq.take 1
        |> Seq.groupBy(fun row -> row.PKSchema.Value, row.PKTable)
        |> Seq.collect(fun ((pschema, ptable), rows) ->
            let constraints =
                rows
                |> Seq.groupBy(fun row -> (row.CONSTRAINT_SCHEMA, row.CONSTRAINT_NAME), (row.FKSchema.Value, row.FKTable))
                |> Seq.sortByDescending(fst >> snd >> getDepth)
            let foreigns =
                constraints
                |> Seq.collect(fun (((cschema, ctable), (fschema, ftable)), rows)->
                    let condf =
                        constraints
                        |> Seq.head
                        |> snd
                        |> Seq.map(fun row -> sprintf "FT.[%s] = D.[%s]" row.FKColumn.Value  row.PKColumn.Value )
                        |> String.concat " AND "
                    [
                        sprintf "    DELETE FROM [%s].[%s] "    fschema ftable
                        sprintf "           FROM [%s].[%s] FT " fschema ftable
                        sprintf "           JOIN deleted D ON %s;" condf
                    ]
                )
            let condp =
                constraints
                |> Seq.head
                |> snd
                |> Seq.map(fun row -> sprintf "PT.[%s] = D.[%s]" row.PKColumn.Value  row.PKColumn.Value )
                |> String.concat " AND "
            [
                yield  sprintf "IF EXISTS (SELECT * FROM sys.objects o JOIN sys.schemas s ON s.schema_id = o.schema_id "
                yield  sprintf "    WHERE s.name = '%s' AND  o.name = '%s_DELETE_TG')"  pschema ptable
                yield  sprintf "  DROP TRIGGER [%s].[%s_DELETE_TG]"                     pschema ptable
                yield  sprintf "GO"
                yield  sprintf "-- generated in F#Station: basic18.snippets FSI ZONE/SQLCascadeTriggers"
                yield  sprintf "CREATE TRIGGER [%s].[%s_DELETE_TG]"                     pschema ptable
                yield  sprintf "            ON [%s].[%s]"                               pschema ptable
                yield  sprintf "    INSTEAD OF DELETE AS "
                yield  sprintf "BEGIN"
                yield  sprintf "    SET NOCOUNT ON;"
                yield! foreigns
                yield  sprintf "    DELETE FROM [%s].[%s] "                             pschema ptable
                yield  sprintf "           FROM [%s].[%s] PT "                          pschema ptable
                yield  sprintf "           JOIN deleted D ON %s;"                       condp
                yield  sprintf "END"
                yield  sprintf "GO"
            ]
        ) 
        |> Seq.iter (printfn "%s")
        ()

    generateTriggers (fun row -> row.PKTable.StartsWith "Clc_" || row.PKTable.StartsWith "RLE_" )
Multiple items
namespace FSharp

--------------------
namespace Microsoft.FSharp
Multiple items
namespace FSharp.Data

--------------------
namespace Microsoft.FSharp.Data
Multiple items
type LiteralAttribute =
  inherit Attribute
  new : unit -> LiteralAttribute

--------------------
new : unit -> LiteralAttribute
val ConnectionString : string
val generateTriggers : filter:('a -> bool) -> unit
val filter : ('a -> bool)
val cmd : System.IDisposable
type SqlCommandProvider



<summary>Typed representation of a T-SQL statement to execute against a SQL Server database.</summary>
<param name='CommandText'>Transact-SQL statement to execute at the data source.</param>
<param name='ConnectionStringOrName'>String used to open a SQL Server database or the name of the connection string in the configuration file in the form of “name=&lt;connection string name&gt;”.</param>
<param name='ResultType'>A value that defines structure of result: Records, Tuples, DataTable, or SqlDataReader.</param>
<param name='SingleRow'>If set the query is expected to return a single row of the result set. See MSDN documentation for details on CommandBehavior.SingleRow.</param>
<param name='ConfigFile'>The name of the configuration file that’s used for connection strings at DESIGN-TIME. The default value is app.config or web.config.</param>
<param name='AllParametersOptional'>If set all parameters become optional. NULL input values must be handled inside T-SQL.</param>
<param name='ResolutionFolder'>A folder to be used to resolve relative file paths to *.sql script files at compile time. The default value is the folder that contains the project or script.</param>
<param name='DataDirectory'>The name of the data directory that replaces |DataDirectory| in connection strings. The default value is the project or script directory.</param>
<param name='TempTableDefinitions'>Temp tables create command.</param>
<param name='TableVarMapping'>List table-valued parameters in the format of "@tvp1=[dbo].[TVP_IDs]; @tvp2=[dbo].[TVP_IDs]"</param>
type ResultType =
  | Records = 0
  | Tuples = 1
  | DataTable = 2
  | DataReader = 3
ResultType.Records: ResultType = 0
val filteredRows : seq<'a>
module Seq

from Microsoft.FSharp.Collections
val filter : predicate:('T -> bool) -> source:seq<'T> -> seq<'T>
val cache : source:seq<'T> -> seq<'T>
val depths : Map<(string * string),int>
val map : mapping:('T -> 'U) -> source:seq<'T> -> seq<'U>
val row : 'a
val distinct : source:seq<'T> -> seq<'T> (requires equality)
val rows : seq<(string * string) * (string * string)>
val level : (string * string -> int)
val table : string * string
val p : string * string
val ch : string * string
val fst : tuple:('T1 * 'T2) -> 'T1
val s : seq<int>
val isEmpty : source:seq<'T> -> bool
val max : source:seq<'T> -> 'T (requires comparison)
val snd : tuple:('T1 * 'T2) -> 'T2
Multiple items
module Map

from Microsoft.FSharp.Collections

--------------------
type Map<'Key,'Value (requires comparison)> =
  interface IReadOnlyDictionary<'Key,'Value>
  interface IReadOnlyCollection<KeyValuePair<'Key,'Value>>
  interface IEnumerable
  interface IComparable
  interface IEnumerable<KeyValuePair<'Key,'Value>>
  interface ICollection<KeyValuePair<'Key,'Value>>
  interface IDictionary<'Key,'Value>
  new : elements:seq<'Key * 'Value> -> Map<'Key,'Value>
  member Add : key:'Key * value:'Value -> Map<'Key,'Value>
  member ContainsKey : key:'Key -> bool
  ...

--------------------
new : elements:seq<'Key * 'Value> -> Map<'Key,'Value>
val getDepth : (string * string -> int)
val t : string * string
val tryFind : key:'Key -> table:Map<'Key,'T> -> 'T option (requires comparison)
module Option

from Microsoft.FSharp.Core
val defaultValue : value:'T -> option:'T option -> 'T
val groupBy : projection:('T -> 'Key) -> source:seq<'T> -> seq<'Key * seq<'T>> (requires equality)
val collect : mapping:('T -> #seq<'U>) -> source:seq<'T> -> seq<'U>
val pschema : string
val ptable : string
val rows : seq<'a>
val constraints : seq<((obj * obj) * (string * string)) * seq<'a>>
val sortByDescending : projection:('T -> 'Key) -> source:seq<'T> -> seq<'T> (requires comparison)
val foreigns : seq<string>
val cschema : obj
val ctable : obj
val fschema : string
val ftable : string
val condf : string
val head : source:seq<'T> -> 'T
val sprintf : format:Printf.StringFormat<'T> -> 'T
module String

from Microsoft.FSharp.Core
val concat : sep:string -> strings:seq<string> -> string
val condp : string
val iter : action:('T -> unit) -> source:seq<'T> -> unit
val printfn : format:Printf.TextWriterFormat<'T> -> 'T
val row : obj

More information

Link:http://fssnip.net/7YW
Posted:7 days ago
Author:Kevinnak
Tags: cascade delete