Part 1: Create User Defined Type PointType

Transcription

1 Samantha Orogvany-Charpentier CIS 612: Big Data Assignment 2 As part of this lab, I created both a User-Defined Type and a Table Function using CLRs compiled in Visual Studio Then I was able to register the assembly in SQL Server 2014 by referencing the path to the.dll file. Once created, I was able to use the new User-Defined Type to both insert values into a table with that column datatype, and I was able to update specific values of the User-Defined Type. Part 1: Create User Defined Type PointType using System; using System. Data. SqlTypes; using Microsoft. SqlServer. Server; [ Serializable] [ SqlUserDefinedType ( Format. Native )] public struct PointType : INullable private int x; private int y; private bool _null; public int X get ; set ; public int Y get ; set ; public override string ToString () return string. Format ( "0:1", X, Y ); public bool IsNull get return _null ; public static PointType Null get PointType h = new PointType (); h. _null = true; return h;

2 public static PointType Parse ( SqlString s) if ( s. IsNull) return Null; var u = new PointType (); var splitelements = Convert. ToString ( s ). Split ( ':' ); if ( splitelements. Length < 2 ) return Null; int parsedintx = 0; int parsedinty = 0; var xparsesuccess = int. TryParse ( splitelements [ 0 ], out parsedintx ); var yparsesuccess = int. TryParse ( splitelements [ 1 ], out parsedinty ); if (! xparsesuccess! yparsesuccess ) return Null; u. X = parsedintx; u. Y = parsedinty ; return u; Compile code to produce dll: Testing User Defined Type PointType Step 1: Create Assembly from ddl USE Company CREATE ASSEMBLY UserDefinedTypesLab FROM 'C:\Users\Navi\Documents\Visual Studio 2015\Projects\Database1\Database1\bin\Debug\UserDefinedTypesLab.dll' WITH PERMISSION_SET = SAFE

3 Step 2: Create Data Type CREATE TYPE dbo. PointType EXTERNAL NAME [ UserDefinedTypesLab ].[ PointType] TestScript1 CREATE TABLE dbo. TablePoints ( ID int Identity ( 1, 1 ) Primary Key, Pnt PointType) INSERT INTO dbo. TablePoints ( Pnt ) VALUES ( CONVERT ( PointType, '3:4' )) INSERT INTO dbo. TablePoints ( Pnt ) VALUES ( CONVERT ( PointType, '-1:5' )) INSERT INTO dbo. TablePoints ( Pnt ) VALUES ( CAST ( '1:99' AS PointType ))

4 SELECT ID, Pnt. ToString () AS StringPoint, Pnt. X AS X, Pnt. Y AS Y FROM dbo. TablePoints TestScript2 CREATE TABLE Locations ( grid_location dbo. PointType) INSERT INTO Locations ( grid_location ) VALUES ( '3:2' ); INSERT INTO Locations ( grid_location ) VALUES ( '-1:1' ); INSERT INTO Locations ( grid_location ) VALUES ( '-1:-1' ); INSERT INTO Locations ( grid_location ) VALUES ( '-8:-9' ); INSERT INTO Locations ( grid_location ) VALUES ( '4:-9' );

5 SELECT * FROM dbo. Locations SELECT grid_location. X AS "X", grid_location. Y AS "Y", grid_location. ToString () AS "Point" FROM dbo. Locations

6 UPDATE dbo. Locations SET grid_location. X = 5 WHERE grid_location. Y < 0 SELECT grid_location. X AS "X", grid_location. Y AS "Y", grid_location. ToString () AS "Point" FROM dbo. Locations As expected, we were able to update the User-defined type s value. Part 2: Create Table Function in CLR to return Dept_GeoLocation using Microsoft. SqlServer. Server; using System. Collections; using System. Collections. Generic; using System. Data. SqlClient; using System. Data. SqlTypes; public partial class UserDefinedFunctions [ SqlFunction( DataAccess = DataAccessKind. Read, FillRowMethodName = "Dept_GeoLocations_FillRow", TableDefinition = "Dnumber int, Dlocation int, Geolocation PointType" )] public static IEnumerable Dept_GeoLocations () var resultcollection = new ArrayList ();

7 using ( SqlConnection connection = new SqlConnection ( "Context Connection = true;" )) connection. Open (); using ( var selectdeptlocations = new SqlCommand (@ "SELECT dnumber, dlocation FROM company.dbo.dept_locations", connection )) using ( var selectlocations = new SqlCommand (@ "SELECT grid_location.tostring() FROM company.dbo.locations", connection )) var locationlist = new List <string> (); var locationindex = 0; using ( SqlDataReader locationreader = selectlocations. ExecuteReader ()) while ( locationreader. Read ()) var geolocation = locationreader. GetString ( 0 ); locationlist. Add ( geolocation ); using ( SqlDataReader deptlocationreader = selectdeptlocations. ExecuteReader ()) while ( deptlocationreader. Read ()) PointType geolocation = PointType. Null; string coordinates = null; if ( locationlist. Count > locationindex) coordinates = locationlist [ locationindex ]; geolocation = PointType. Parse ( coordinates ); resultcollection. Add ( new GeoLocationResult ( deptlocationreader. GetSqlInt32 ( 0 ), deptlocationreader. GetSqlString ( 1 ), geolocation )); locationindex ++; connection. Close (); return resultcollection; private class GeoLocationResult public SqlInt32 Dnumber; public SqlString Dlocation; public PointType Geolocation;

8 public GeoLocationResult ( SqlInt32 dnumber, SqlString dlocation, PointType geolocation) Dnumber = dnumber; Dlocation = dlocation; Geolocation = geolocation; public static void Dept_GeoLocations_FillRow ( object geolocationresultobj, out SqlInt32 dnumber, out SqlString dlocation, out PointType geolocation ) var georesult = ( GeoLocationResult ) geolocationresultobj; dnumber = georesult. Dnumber; dlocation = georesult. Dlocation; geolocation = georesult. Geolocation ; This code was compiled as part of the dll creation for part 1. Creating Function from CLR CREATE FUNCTION Dept_GeoLocation () RETURNS TABLE ( Dnumber int, Dlocation nvarchar ( 15 ), Geolocation PointType) AS EXTERNAL NAME UserDefinedTypesLab. UserDefinedFunctions. Dept_GeoLocations; GO

9 Testing CLR Table Function Select table values to show stored values: SELECT * FROM Dept_GeoLocation () SELECT g. dnumber, g. dlocation, g. geolocation. X AS "X", g. geolocation. Y AS "Y", g. geolocation. ToString () AS "Point" FROM Dept_GeoLocation () g

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