A database connection string provides information to connect a front-end application to a back-end database. It includes details like the database driver, server, database name, and credentials. Connection strings are used to connect to all major database types, including SQL Server, Oracle, and MySQL. Common errors can occur if the connection string details are incorrect.

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2. What is DB Connection String? DB Connection String is a special type of string which provide the information about the data source i.e. database and the means which is going to connect with it. The connecting means can be any front-end application written in any computer language and the database source is known as back-end application. The establiched connection between both the application managed by underlying driver. This driver works as bridge between the applications and the data sharing and trasaction continues through out the process. The DB Connection string is based on SQL(Structured Query Language).

3. SQL Server DB Connection String SQL ODBC connection strings Standard Security : "Driver={SQLServer};Server=Server=DBName;Uid=User;Pwd=Password;" Trusted connection : "Driver={SQLServer};Server=Server;Database=DBName;Trusted_Connection=yes;"

4. SQL Server DB Connection String SQL OleDbConnection .NET strings Standard Security: "Provider=SQLOLEDB;Data Source=Server;Initial Catalog=DBName;UserId=User;Password=Password;" Trusted connection: "Provider=SQLOLEDB;Data Source=Server;Initial Catalog=DBName;Integrated Security=SSPI;"

5. Oracle DB Connection String Data Source hr = CoCreateInstance(CLSID_OraOLEDB, NULL, CLSCTX_INPROC_SERVER, IID_IDBInitialize, (void**)&pIDBInitialize); Connecting to an Oracle Database "Provider=OraOLEDB.Oracle;User ID=user;Password=pwd;Data Source=constr;"

6. Oracle DB Connection String Password Expiration (Connect using connectionstring) Dim con As New ADODB.Connection con.ConnectionString = "Provider=OraOLEDB.Oracle;Data Source=MyOraDb;" & _ "User ID=scott;Password=tiger;" con.Open

7. MySQL DB Connection String Open connection to local MySQL database using MySQL ODBC 3.51 Driver "Provider=MSDASQL; DRIVER={MySQL ODBC 3.51Driver}; SERVER= localhost; DATABASE=DBName; UID=User; PASSWORD=Password; OPTION=3"

8. Common Errors to DB Connection String Common Errors of Oracle : ORA-03113: TNS:end-of-file on communication channel ORA-12154: TNS:could not resolve service name ORA-03121: no interface driver connection - function not performed ORA-12170: TNS:Connect timeout occurred

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