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Where to store the connection string is a challenge that every application using a relational database has to solve. This is a simple persistence problem, with a chicken and an egg twist. When a relational database is the chosen source of persistence, it s the default location for storing information. The connection string, however, is needed to get to your location of persistence. This, coupled with the fact that sensitive security information is often stored in the connection string, and that the string frequently needs to change as you move from development to staging to production, presents a problem that needs some careful consideration to solve. You can hard code the connection string in a public, static string of some type in the application. This means the string becomes compiled into the application, which can have the feel of being more secure than storing somewhere in a flat file. Keep in mind, though, that .NET libraries are compiled to Common Intermediate Language (CIL) code, which can easily be decompiled. Here s a line of code from a data access layer containing sensitive authentication information: SqlConnection cn = new SqlConnection("server=.;database=pubs;uid=sa;pwd=password"); And here s the resulting, compiled, CIL code (viewed via ILDASM): IL_0007: ldstr "server=.;database=pubs;uid=sa;pwd=password" IL_000c: newobj instance void [System.Data]System.Data.SqlClient.SqlConnection::.ctor(string) Not really secure. Don t fool yourself into thinking that it is. To show you how connection strings can easily be secured, we re first going to look at a new feature the connectionStrings element in the Framework for connection string management. You need to see this feature in order to work your way back to how to protect connection strings. Take a look at the connectionStrings element in the configuration file: <connectionStrings> <add name="localPubs" connectionString="server=.;database=pubs;uid=sa;pwd=123123"/> <add name="productionPubs" connectionString="server=prodBox;database=pubs;uid=web_db_user;pwd=ab@2de3"/> </connectionStrings> This gives you a dedicated place in the configuration file for storing connection strings. The feature just acknowledges the fact that today a lot of folks are storing these strings in the appSettings element. By breaking it out into its own section, you separate the sensitive connection information from any other values you re storing within appSettings. Later you ll
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As mentioned earlier, the (0,0) texture coordinate corresponds to the top-left pixel of your texture, while the (1,1) texture coordinate corresponds to the bottom-right pixel. This doesn t mean you have to use texture coordinates between the [0,1] region, however. For example, it s entirely valid to specify (1.5f, 0.5f) as the texture coordinate. In such cases, you just have to let XNA know how to handle such coordinates by setting the U and V texture addressing modes (where U is the first texture coordinate and V is the second). The following code defines a triangle having U and V coordinates outside the [0,1] region: private void InitVertices() { vertices = new VertexPositionTexture[3]; int i = 0; vertices[i++] = new VertexPositionTexture(new Vector3(-3, -3, -1), new Vector2(-0.5f,1.5f)); vertices[i++] = new VertexPositionTexture(new Vector3(0, 5, -1), new Vector2(0.5f, -1.5f)); vertices[i++] = new VertexPositionTexture(new Vector3(3, -3, -1), new Vector2(1.5f,1.5f)); myVertexDeclaration = new VertexDeclaration(device, VertexPositionTexture.VertexElements); } Next, you need to instruct XNA how it should handle these coordinates by setting the addressing mode of the texture sampler in the graphics card, which is used to sample colors from the texture. TextureAddressMode.Clamp Use this code to set the U and V addressing modes to Clamp: device.SamplerStates[0].AddressU = TextureAddressMode.Clamp; device.SamplerStates[0].AddressV = TextureAddressMode.Clamp; This addressing mode will cause all texture coordinates to be clamped to the [0,1] region. All coordinates less than 0 will be clamped to 0, while all coordinates greater than 1 will be clamped to 1. As a result, all the pixels of the triangle having a texture coordinate outside the [0,1] region will get the color of the pixel at the edge of the texture, as shown on the left side of Figure 5-5.
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Like the OleDbDataAdapter, the ObjectAdapter implements a Fill() method (actually, several overloads of Fill() for easy use). In the end, though, they all route to a single Fill() method that fills a DataTable from data in a source object: Public Sub Fill(ByVal dt As DataTable, ByVal source As Object) If source Is Nothing Then Throw New ArgumentException(My.Resources.NothingNotValid) End If Dim columns As List(Of String) = GetColumns(source) If columns.Count < 1 Then Exit Sub ' create columns if needed For Each column As String In columns If Not dt.Columns.Contains(column) Then dt.Columns.Add(column) End If Next ' get an IList and copy the data CopyData(dt, GetIList(source), columns) End Sub The first thing this method does is get a list of column names (typically, the public properties and fields) from the data source. It does this by calling a GetColumns() method (which will be covered later). Next, the target DataTable is checked to ensure that it has a column corresponding to every column name retrieved from GetColumns(). If any columns are missing, they are added to the DataTable: For Each column As String In columns If Not dt.Columns.Contains(column) Then dt.Columns.Add(column) End If This ensures that all properties or fields from the data source have a column in the DataTable so they can be copied. With that done, all that remains is to initiate the copy of data from the source object to the DataTable: CopyData(dt, GetIList(source), columns)
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In each case, there is minimal overhead associated with lock acquisition. TX transaction locks are extremely scalable both in terms of performance and cardinality. TM and DDL locks are applied in the least restrictive mode whenever possible. Latches and enqueues are both very lightweight and fast (enqueues are slightly the heavier of the two, though more feature-rich). Problems only arise from poorly designed applications that hold locks for longer than necessary and cause blocking in the database. If you design your code well, Oracle s locking mechanisms will allow for scalable, highly concurrent applications.
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We then start up SQL*Plus (Oracle s command-line interface) and connect as sysdba (the account that is allowed to do virtually anything in the database). Initially, assuming you haven t yet set the environment variable ORACLE_SID, you ll see: [ora11gr2@dellpe dbs]$ sqlplus / as sysdba SQL*Plus: Release Production on Fri Dec 11 14:07:14 2009 Copyright (c) 1982, 2009, Oracle. All rights reserved.
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This method creates a sequence of bytes that contain the Person object and write it to the Stream. All that remains to do is Close the stream to make sure that the data is properly written to the disk. Listing 21-2 creates a machine-readable file, which is efficient and compact, but not readable by programmers. Deserializing an object is a very similar process, as demonstrated by Listing 21-3. Listing 21-3. Deserializing the Object using using using using System; System.IO; System.Runtime.Serialization; System.Runtime.Serialization.Formatters.Binary;
AJAXBook.ImitationSportsCar = function(strMake, strModel, strYear) { AJAXBook.ImitationSportsCar.initializeBase(this, [strMake, strModel, strYear]); } AJAXBook.ImitationSportsCar.prototype = { Dispose: function() { Alert("Disposing instance of class ImitationSportsCar"); } } AJAXBook.ImitationSportsCar.registerClass( "AJAXBook.ImitationSportsCar", AJAXBook.Car);
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