Advanced ASP. Software Engineering Group. Departamento de Lenguajes y Sistemas Informáticos. escuela técnica superior de ingeniería informática
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1 Tiempo: 2h [Ángel US V7] Diseño: Amador Durán Toro ( Departamen de Lenguajes y Sistemas Ináticos escuela técnica superior de ingeniería inática Versión original: Amador Durán Toro (diciembre 2004 Última revisión: Amador Durán y David Benavides (diciembre 2006 revisión y buenas prácticas. Advanced Software Engineering Group November 2007
2 y Sistemas Ináticos Basic Concepts Advanced ADO MS ActiveX Data Objects ActiveX objects allow access Data Sres using code. Connection and Recordset are the most relevant objects. Connection Connection Command Recordset Error Field Parameter Grupo de Ingeniería del Software 1
3 y Sistemas Ináticos Acrs Advanced Data Provider (OLEDB, ODBC Connection Data Base (MySQL, MS Access, SQL Server execution Connection Data Provider BD ADO OLEDB BD ADO OLEDB ODBC BD Grupo de Ingeniería del Software 2
4 y Sistemas Ináticos Connection definition: Advanced This object represents a connection a Data Sre (usually a data base. Ussually the usage of this object is: try try connecion connecion Server.CreateObject( Server.CreateObject( "ADODB.Connection" "ADODB.Connection" connection.open( connection.open( "ProviderMicrosoft.Jet.OLEDB.4.0;" "ProviderMicrosoft.Jet.OLEDB.4.0;" + "Data "Data Source" Source" + Server.MapPath( Server.MapPath( "bd/bd.mdb" "bd/bd.mdb" catch( catch( e e error error handling handling Response.End( Response.End( DB DB access access (conexion.execute( (conexion.execute( conexion.close( conexion.close( conexion conexion null; null; free free resources resources (memory (memory Grupo de Ingeniería del Software 3
5 y Sistemas Ináticos Methods of Connection Advanced BeginTrans( (: begin a transaction. CommitTrans( (: end a transacction and commit changes. RollbackTrans( (: abort a transaction. Open( connectionstring,, [user[ user], [pwd[ pwd] ] : open a connection on the BD specified by connectionstring. Specific syntax of connectionstring depends on the BD use. User and password are optional. In order specify the path the BD file Server.MapPath is usually used.(usually specify a MS Access file. Close( (: close this connection and all recordsets it open through. Execute( ( SQL : execute a SQL command. If the commad is a query, it returns a Recordset. Grupo de Ingeniería del Software 4
6 y Sistemas Ináticos Recordset definition: Advanced Allows add, delete and uptade rows of tables on the DB, but we will use it only retrieve the result of queries. Ussually the usage of this object is: try try rs rs connection.execute( connection.execute( "SELECT "SELECT " " or or rs rs Server.CreateObject("ADODB.Recordset" Server.CreateObject("ADODB.Recordset" rs.open( rs.open( "SELECT "SELECT ", ", connection connection catch( catch( e e Error Error handling while handling while (!rs.eof (!rs.eof Response.End( Response.Write( Response.End( Response.Write( rs( column1" rs( column1".value.value Iterate Iterate on on the the recordset Response.Write( recordset Response.Write( rs( columnn" rs( columnn".value.value rs rs null; null; free free resources rs.movenext( resources rs.movenext( Grupo de Ingeniería del Software 5
7 y Sistemas Ináticos Recordset properties: Can be used as a map: Advanced rs( "column i ".Value value of column i EOF: boolean attribute that allows test if we had reached the end of this recordset. Recordset methods: Open( ( "SQL", conexión n : execute a query on the DB and retrieves the result. Close( (: close this recordset and free resources. MoveFirst(, MoveLast(, MoveNext(, Move( ( n : displacement of the internal pointer the first, last, next or n records forward or back (if n < 0. If If we we use use Access Access and and execute execute MoveLast(, MoveLast(, MoveFirst( MoveFirst( no no effect. effect. Grupo de Ingeniería del Software 6
8 y Sistemas Ináticos Advanced try/catch blocks using and ADO Each operation using ADO objects could raise exceptions that should be catched. The object raised by the exceptions type Error and their attributes are: name : name of this error, usually "Error". number: number (code of this error. description: brief descripction of what caused this error. message: ussually equal description. Error handling using a catch block Usually the code of catch blocks provides ination about the error users, frees resources and sps page processing using Response.End( (. Grupo de Ingeniería del Software 7
9 y Sistemas Ináticos Advanced Code modularization implement data treatment: validation Data sred on Data sred on Session Session yes?? no Grupo de Ingeniería del Software 8
10 y Sistemas Ináticos Grupo de Ingeniería del var Session("" var Session("" var Session("" var Session("" Create a object sre data. Create a object sre data. if (! if (! new Object( new Object(.name Default Name";.name Default Name";.address "Default address";.address "Default address"; Sre data in session Sre data in session Session("" ; Session("" ; Create an array sre Create an array sre if (! if (! new Array( new Array( Sre in session Sre in session Session("" ; Session("" ; id"div_"> id"div_"> for ( e in for ( e in Response.Write( " class'error'>" Response.Write( " class'error'>" Response.Write( [ e ] Response.Write( [ e ] Response.Write( "" Response.Write( "".. id"div_name"> id"div_name"> <label for"name">name:</label> <label for"name">name:</label> <input id"name" name"name" <input id"name" name"name" value".name " /> value".name " /> We We are are declaring declaring attributes attributes in in a a implicit implicit and and dynamic dynamic way. way. Create Create two two objects objects in in session: session: Sre Sre data data Sre Sre found found We We show show found found 9
11 y Sistemas Ináticos validation Verifythe Verifythe value of data value of data and. If and. If there are no there are no values, values, redirect the redirect the.. Assign Assign values sent values sent Validate Validate data at server data at server Redifect Redifect if if were found were found Else redirect Else redirect processing processing page <script <script language"javascript" language"javascript" src"validation.js" src"validation.js" runat"server"></script> runat"server"></script> Our Session("" Our proposal proposal is is reuse reuse Session("" validation Session("" validation logic logic across across Session("" client client and and server. server. (runat server if if ( ( && && (runat server.name.name Request.Form("name".Item; Request.Form("name".Item;.direccion.direccion Request.Form( address".item; Request.Form( address".item; validate( validate( if if ( (.length.length > > 0 0 Session( Session( "" "" ; ; Session( Session( "" "" ; ; Response.Redirect( Response.Redirect( ".asp" ".asp" else else Response.Redirect( Response.Redirect( "execution.asp" "execution.asp" There There are are certain certain implications implications if if we we reuse reuse validation validation logic logic (validation (validation function function should should be be independent independent from from DOM DOM code code obtain obtain data data from from our our.. So, So, all all params params should should be be passed passed reuse reuse those those functions. functions. else else Response.Redirect( Response.Redirect( ".asp" ".asp" Grupo de Ingeniería del Software 10
12 y Sistemas Ináticos Validation Steps 1.Get the object 2.Get the value 3.Check value 4.Show error Example: function process( function process( var ctrlname document.getelementbyid( name var ctrlname document.getelementbyid( name var ctrl document.getelementbyid( var ctrl document.getelementbyid( var name ctrlname.value; var name ctrlname.value; var ctrl .value; var ctrl .value; var ; var ; if(name if(name + Name field can not be empty ; + Name field can not be empty ; if( if( + <br/> field can not be empty ; + <br/> field can not be empty ; else else reg. exp. validation reg. exp. validation var diverrors document.getelementbyid( var diverrors document.getelementbyid( diverror.innerthtml; diverror.innerthtml; return ( return ( Advanced Code Code that that can can be be used used on on client client and and server server side side CLIENT SIDE CODE CLIENT SIDE CODE function process( function process( var ctrlname document.getelementbyid( name var ctrlname document.getelementbyid( name var ctrl document.getelementbyid( var ctrl document.getelementbyid( var name ctrlname.value; var name ctrlname.value; var ctrl .value; var ctrl .value; var validate(name, var validate(name, var diverrors document.getelementbyid( var diverrors document.getelementbyid( diverror.innerthtml; diverror.innerthtml; return ( return ( REUSABLE (PURE VALIDATION LOGIC CODE REUSABLE (PURE VALIDATION LOGIC CODE function validate(name, function validate(name, var ; var ; if(name if(name + Name field can not be empty ; + Name field can not be empty ; if( if( + <br/> field can not be empty ; + <br/> field can not be empty ; else else reg. exp. validation reg. exp. validation return ; return ;
13 y Sistemas Ináticos Advanced Code modularization when we use ADO: validation Data Data sred sred on on Session Session yes?? no Data Access Logic Data Data Base Base A Management func inserta(p1,p2 var SQL. B Management func insertb(p1,p2 var SQL.... X Management func insertx(p1,p2 var SQL. Grupo de Ingeniería del Software 12
14 y Sistemas Ináticos Retriveve Retriveve data data Make null Make null session session values values Implement Implement features (e.g. features (e.g. user creation user <!-- <!-- #include #include file file UserMgmnt.inc" UserMgmnt.inc" --> --> Session("" Session("" Session("" Session("" null; null; Session("" Session("" null; null; <html> <html> <head> <head> <title>registration <title>registration result</title> result</title> </head> </head> <body> <body> if(createuser(.name,.address if(createuser(.name,.address id"div_ok"> id"div_ok"> <h1>hello <h1>hello.name.name,, thankyouforregistering</h1> thankyouforregistering</h1> else else else % id div_registration_error > id div_registration_error > Sorry, Sorry, there there is is a a user user that that your your address, address, so so your your registration registration failed. failed. id"div_back"> id"div_back"> Press Press <a <a href"ulario.asp">here</a> href"ulario.asp">here</a> return return the the </body> </body> </html> </html> Grupo de Ingeniería del Software 13
15 y Sistemas Ináticos Management of X func insertx(p1,p2 var SQL. % > Implement data Implement data access logic: access logic: Create Create Retrieve(Select Retrieve(Select Update Update Delete Delete Advanced /* /* Users Users Management Management */ */ Creation: Creation: function function createuser(user,address createuser(user,address resulttrue; resulttrue; usesusersbyaddress(address usesusersbyaddress(address if(users.eof if(users.eof SQL SQL INSERT INSERT INTO INTO Users Users ; ; conserver.createobject( conserver.createobject( "ADODB.Connection" "ADODB.Connection" con.open( con.open( "ProviderMicrosoft.Jet.OLEDB.4.0;" "ProviderMicrosoft.Jet.OLEDB.4.0;" + + "Data "Data Source" Source" + + Server.MapPath( Server.MapPath( "bd/bd.mdb" "bd/bd.mdb" con.execute(sql con.execute(sql This This code code implements implements not not else else data data access access logic logic but but resultfalse resultfalse; false; bussiness bussiness logic. logic. usersnull usersnull; null; return return result; result; Select Select users users : : Duplication function function usersbyaddress(address Duplication of of connection connection usersbyaddress(address data SQL SELECT SQL SELECT * * FROM FROM Users Users ; data / / code code ; SQL+ WHERE SQL+ WHERE Adress` +address+ ; Adress` +address+ ; con ; con ; recordset recordset Server.CreateObject("ADODB.Recordset" Server.CreateObject("ADODB.Recordset" rs.open( rs.open( "SELECT "SELECT ", ", con con return return recordset; recordset; Grupo de Ingeniería del Software 14
16 y Sistemas Ináticos Advanced Usually for each function in the data access & management layer we should: Build SQL command [Optional] Treatment and atting of parameters. Get a connection. Options: Creation and opening directly on the function Get it from Application or Session contexts Connection as parameter of each function SQL command execution If we opened a connection we must close it. [Optional] Error treatment (It could be delegated on the calling code for a more specific handling. return of results.
17 y Sistemas Ináticos Connection Creat./Open. var connection ; var connstr ; connection.open Management of X % > func insertx(p1,p2 var SQL. % > Connection Closing connection.close; connectionnull; % <!-- <!-- #include #include file file OpenDB.inc" OpenDB.inc" --> --> <!-- <!-- #include #include file file UserMgmnt.inc" UserMgmnt.inc" --> --> Session("" Session("" Session("" Session("" null; null; Session("" Session("" null; null; <html> <html> <head> <head> <title>registration <title>registration result</title> result</title> </head> </head> <body> <body> if(createuser(.name,.address,connection if(createuser(.name,.address,connection id"div_ok"> id"div_ok"> <h1>hello <h1>hello.name.name,, thankyouforregistering</h1> thankyouforregistering</h1> else else else % id div_registration_error > id div_registration_error > Sorry, Sorry, there there is is a a user user that that your your address, address, so so your your registration registration failed. failed. id"div_back"> id"div_back"> Press Press <a <a href"ulario.asp">here</a> href"ulario.asp">here</a> return return the the </body> </body> <!-- <!-- #include #include file file CloseDB.inc" CloseDB.inc" --> --> </html> </html>
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