SQL Server Connection Strings. This is the first of a series of posts on SQL Server connection strings. Howard s ODBC Connection String FAQ. Everything you always wanted to know about ODBC connection strings and the iSeries. When using ODBC to talk to the.I don’t think connection strings are all that complicated but I often see developers have problems because they simply cloned an existing connection string (or found one on the internet) and tweaked it for the task at hand without really understanding what the keywords and values mean. This often results in run- time errors that can be tricky to diagnose. This is the first of a series of posts on SQL Server connection strings. I don’t think connection strings are all that complicated but I often see developers have. I know that you use this for SQL authentication <connectionStrings> <add name. VB.Net Quick Guide - Learn VB.Net Programming in simple and easy steps starting from Environment setup, Basic Syntax, Data Types, Type Conversion, Variables.
![]() In this post, I’ll provide a connection string overview and discuss Sql. Client connection strings and examples. I’ll discuss OLE DB and ODBC (used via ADO or ADO. NET) and JDBC in more detail the future articles. Overview. SQL Server can be accessed using several technologies, each of which has different connection string particulars. Connection strings are provider/driver specific so one first needs to decide on a client API before formulating the proper string can be created. All connection strings share the same basic format, name/value pairs separated by semicolons, but the actual connection string keywords may vary by provider. Which keywords are required or optional also vary by provider and providers often share the same keywords (or provide synonyms) to minimize the connection string changes when switching between different providers. Most connection string keywords are optional and need to be specified only when the default is not appropriate. Connection string values should be enclosed in single or double quotes when the value may include a semicolon or equal sign (e. At the end of the day, the provider/driver needs to know at least. ![]() It is possible to use OLE DB or ODBC for SQL Server data access in managed code but there is seldom a reason to do so since Sql. Client offers high- performance access to SQL Server natively. The Sql. Connection. String. Builder class provides a programmatic way to build connection strings needed by Sql. Connection class. The nice thing about Sql. Connection. String. Builder is that it provides Intelli. Sense and avoids connection string typos. It should always be used when constructing connection strings based in user input (e. But you still need to know which connection string properties (keywords) you need to set along with the default values. The examples here apply regardless of whether or not you use yjr Sql. Connection. String. Builder class. Sql. Client Connection String Keyword Examples. Unlike other providers, there is no “Provider” or “Driver” connection string keyword in a Sql. Client connection string. The minimal Sql. Client connection string need only specify the authentication method. This connection string will connect the default instance on the local machine using Windows authentication under the current process Windows security credentials. Listing 1: Connect to local default instance using Windows authentication. To connect to the local default instance using SQL authentication, just specify the credentials using the “User ID” and “Password” keywords instead of “Integrated Security=SSPI” keyword. SQL authentication is the default when “Integrated Security” or “Trused. Although I commonly see . Be aware that you should encrypt connection strings (or passwords in general) stored in configuration files when using SQL authentication. User ID=My. Login; Password=Mi. P@ssw. 0rd. Listing 2: Connect to local default instance using SQL authentication. One often connects to a remote SQL Server. Along with the authentication method, add the Data Source keyword to specify the desired SQL Server name or network address. Data Source=SQLSERVERNAME; Integrated Security=SSPIListing 3: Connect to default instance on host SQLSERVERNAME using Windows authentication. Data Source=SQLSERVERNAME; User ID=My. Login; Password=Mi. P@ssw. 0rd. Listing 4: Connect to instance on host SQLSERVERNAME using SQL authentication. Note that these same connection strings may be used to connect locally or remotely. Personally, I recommend always specifying the Data Source even when connecting locally. This makes it easy to move the application to another machine using with the same configuration and helps avoid oversights. It is usually best to let Sql. Client determine the appropriate network library to use rather than an explicit specification. Sql. Client will figure out the appropriate network library based on the specified Data Source value. When you connect to a local instance using an unqualified name (or the value “(local)”), Shared Memory is used by default. Sql. Client will use TCP/IP if a FQDN (e. SQLSERVERNAME. My. DOMAIN. COM) or IP address is specified regardless of whether the instance is local or remote. Since TCP/IP is most commonly used nowadays, I’ll focus on TCP/IP in this article and use a FQDN in the subsequent examples to avoid ambiguity. It is often desirable to specify the initial database context in the connection sting. If omitted, the default database of the authenticated account is used. This is accomplished using either the “Initial Catalog” or “Database” keyword. I suggest always including the “Initial Catalog” keyword. Data Source=SQLSERVERNAME. MYDOMAIN. COM; Integrated Security=SSPI; Initial Catalog=My. Database. Listing 4: Connect to default instance on host SQLSERVERNAME using Windows authentication with initial database context of My. Database. Named Instances. The connection strings I’ve shown so far assume the target is a default SQL Server instance listening on port 1. One can run multiple instances of SQL Server on the same host using the named instance feature. If your target database instance is a named instance, Sql. Client will also need to know the instance name or instance port number. The instance name can be specified by appending a backslash and instance name to the Data Source value: Data Source=SQLSERVERNAME. MYDOMAIN. COM\MYINSTANCE; Integrated Security=SSPI; Initial Catalog=My. Database. Listing 5: Connect to named instance on host SQLSERVERNAME using Windows authentication with initial database context of My. Database. As an aside, I often see connectivity problems with named instances due to oversights in the SQL Server configuration. When an instance name is specified, Sql. Client interrogates the SQL Server Brower service on the SQL Server host to determine the instance port (or named pipe name). The SQL Server Brower service is disabled by default so you need to enable and start it in order to connect by the instance name. This can be done using the SQL Server Configuration Manager tool. Also, since the SQL Server Brower service communicates over UDP port 1. You can specify a port number instead of instance name to directly to a named instance (or to a default instance listing on a non- standard port). The port may be specified by appending a comma and port number to the data source value. The needed port number can be ascertained from the SQL Server Configuration Manager tool. Data Source=SQLSERVERNAME. MYDOMAIN. COM,6. 00. Integrated Security=SSPI; Initial Catalog=My. Database. Listing 6: Connect to instance on host SQLSERVERNAME listening on port 6. Windows authentication with initial database context of My. Database. Additional Keywords. In addition to the “Data Source”, “Initial Catalog” and “Integrated Security” (or “User Id” and “Password”) keywords I’ve discussed so far, I recommend that “Application Name” also be specified. The specified string is helps identify the application when monitoring activity on the database server. This is especially useful when an application server or client hosts multiple applications. Data Source=SQLSERVERNAME. MYDOMAIN. COM; Integrated Security=SSPI; Initial Catalog=My. Database; Application Name=Connection String Example. Listing 7: Connect to default instance on host SQLSERVERNAME using Windows authentication with initial database context of My. Database with application name specification. In my opinion, the many other keywords are noise unless the default values are inappropriate for your environment. Summary. You can get by nicely in most cases with only the 4 or 5 Sql. Client connection string keywords I’ve discussed here. I suggest you establish a connection string standard that includes the “Data Source”, “Initial Catalog”, “Application Name” keywords plus the authentication method, “Integrated Security=SSPI” or “User Id” and “Password”. Using ODBC within a . NET application. One of the . NET Framework features often. ADO. NET. Some of its. A . NET data provider is used to. Oracle Data Provider for . NET. One problem is some systems. ODBC (Open Data. Base Connectivity). ODBC is an established industry standard with ODBC. It's a database access library. One aspect of ODBC is that you may use it to access. Oracle, Access, Sybase, my. SQL. spreadsheets, text files, and so forth. It's a mature technology. ODBC driver for a particular database system is. It provides access. ODBC drivers the same way that the OLE DB . NET Data. Provider provides access to native OLE DB Providers. The ODBC . NET. Data Provider is intended to work with all compliant ODBC drivers. Microsoft site states that it has only been tested with the. Microsoft SQL ODBC Driver, Microsoft ODBC driver for Oracle, and. Microsoft Jet ODBC driver. For. instance, Oracle provides a driver for working with an Oracle. The driver manager is used to install the necessary driver. On Windows- based systems, the. ODBC Data Source Administrator is used to create and maintain ODBC. You may utilize an ODBC driver in a . NET application. once it is property installed and set up. If you're using Visual Studio. NET, you may add a reference to its dll file. Microsoft. Data. Odbc. If you're developing from the command. It includes the following. Odbc. Connection: Used to connect to an ODBC data source. The name. assigned to the ODBC data source, during its setup, is used to. It utilizes a previously established ODBC data. Test). The DSN name is used in the connection. Finally, the. connection is closed and all other objects are disposed. The C#. code follows: using System; using Microsoft. Data. Odbc; namespace Builder. ODBC . We can alter our example to. ODBC exceptions are handled separately from generic errors. The ODBC . NET Data Provider provides ODBC access. NET applications through the Microsoft. Data. Odbc namespace. Automatically sign up today! C# ADO. NET Connection String Connection String is a normal String representation which contains Database connection information to establish the connection between Database and the Application. The Connection String includes parameters such as the name of the driver, Server name and Database name , as well as security information such as user name and password. The . NET Framework provides mainly three data providers, they are Microsoft SQL Server. ODBC Here you can see how to make a connection string to the following ADO. NET Data Providers.
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