What is the difference between stored procedure and dynamic SQL?
Stored procedures beat dynamic SQL in terms of performance. A stored procedure is cached in the server memory and its execution is much faster than dynamic SQL. If all the remaining variables are kept constant, stored procedure outperforms dynamic SQL.
How do I create a dynamic query in SQL Java?
There are at least two options:
- Based on table pairs present (by example: “if A and B are present then add A. col1 = B. col2”)
- Based on tables present (“if B is present, then add A. col1 = B. col2; A should be present”
Is the stored procedure safe from SQL injection?
Some database programmers believe that by using stored procedures, their code are safe from SQL injection attacks. That is not entirely true if dynamic query is used inside the stored procedures and the dynamic query is constructed by concatenating the parameters.
When to use dynamic query in stored procedures?
That is not entirely true if dynamic query is used inside the stored procedures and the dynamic query is constructed by concatenating the parameters. In circumstances, where the complicated query may use one, many, all or none of the parameters, it warrants the use of dynamic query.
How are stored procedures used in SQL Server?
Also, a single stored procedure can perform multiple SQL commands, reducing traffic between an application and the database server. Security – Stored procedures are well defined database objects that can be locked down with security measures. Use of typed parameters can help prevent SQL injection attacks.
Which is the safe way to execute a stored procedure?
Use parameterized stored procedure with embedded parameters. Execute stored procedures using a safe interface such as Callable statements in JDBC or CommandObject in ADO. Use a low privileged account to run the database. Give proper roles and privileges to the stored procedure being used in the applications.