How Can I Dynamically Use Table Names in SQL Queries with .NET, and What Security Precautions Are Necessary?

Dynamic Table Name in SQL Queries with .NET

In .NET, passing table names as parameters in SQL queries poses a unique challenge. Unfortunately, direct parameterization of table names is not inherently possible. However, there are workarounds to achieve the desired functionality.

Indirect Parameterization with sp_ExecuteSQL

One approach involves using the sp_ExecuteSQL stored procedure in SQL Server. With this method, you can pass the table name as a string parameter to the stored procedure and dynamically execute a query based on that parameter. However, this technique requires executing two queries instead of one, which can slightly reduce performance.

Concatenating Table Name in TSQL

Another alternative is to concatenate the table name directly into the TSQL string before sending it as a command down the line. This involves building the parameterized TSQL query in C# and specifying the table name manually, while leaving placeholder parameters for the other values. This method offers better performance than the sp_ExecuteSQL approach.

Security Considerations

It's important to note that both approaches require careful whitelisting of the table name to prevent potential security issues. Since the table name is passed as a parameter, it's crucial to restrict the list of acceptable table names to mitigate SQL injection attacks.

Recommendation

Although not an ideal situation, it's possible to parameterize table names indirectly or by concatenating them into the TSQL string. However, it's essential to prioritize security by whitelisting the table names and scrutinizing the code to prevent unauthorized access or modifications.

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