使用准备好的语句获取数据

Question

This is my query

select id,name,address from emp_details where gender = ?

Input : Female , Male

In this usually I need to fetch only Female data or only Male data But some times I need to fetch both Female and Male data using the same query..

Is it possible? If so, how?

Answer 1

just invert the query:

select id,name,address from emp_details where gender <> ?

and specify "male" for getting females, "female" for getting males, and "whatever" for getting both.

Answer 2

Using the same query, no, it's not possible. Use a query without any where clause to do that:

select id,name,address from emp_details

Answer 3

Use the in-clause

where gender in ?

and as parameter a array of string

new String[]{"m","f"}

Answer 4

SELECT id , name , address
FROM emp_details 
WHERE gender IN (?,?);

Male of Female only => set for both ? the same value

PreparedStatement IN clause alternatives?

Answer 5

    String gender="Female ";

    String sql = "select id,name,address from emp_details";

    if(gender!=null && !"".equals(gender))

     {      
        sql+=" where gender = ?";

     }