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In this section, we will cover how to dynamically build a query that has a where clause with the bind values known only at runtime. We will examine the problem by way of an example, and then we will look at a solution. Imagine that we are developing a search page. The where clause of the query that retrieves the searched records changes depending on what the user selects. For example, the user may search for an employee by name, by department number, or both. Figure 7-3 shows a drawing of the relevant portion of the search page.

Employee Name Department Name Go!

[WebMethod] public string[] GetSuggestedStrings(string prefixText, int count) { //Default to 3 if the count is zero if (count == 0) count = 3; List<string> stringList = new List<string>(count); for (int i = 0; i < count; i++) { stringList.Add(prefixText + i.ToString()); } return stringList.ToArray(); }

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Figure 7-3 Portion of a search page where a user can search based on employee information Assume that the following four cases represent the expected behavior of the search page along with the query that would get us the search results (we use the scottemp table for this example): Case 1: If the user enters neither of the fields and clicks the Go! button, we should get records for all employees (the query is select ename, deptno, job, sal from emp) Case 2: If the user enters a string to match the employee name and clicks the Go! button, we should get all records where the employee name begins with the entered value (the query is select ename, deptno, job, sal from emp where ename like ).

Case 3: If the user enters only the department number and clicks the Go! button, we should get all records matching the department number (the query is select ename, deptno, job, sal from emp where deptno= ) Case 4: If the user enters both a string to match the employee name and the department number before clicking the Go! button, we should get all records where the employee name begins with the entered value and the department number matches the entered value (the query is select ename, deptno, job, sal from emp where ename like and deptno = ) The problem boils down to creating dynamically the where clause of a query based on the user input and executing it As you can see, the number of possible queries that need to be generated can explode depending on the number of fields.

This simple web method returns at least three suggested strings that, for the purposes of this sample, are simply the prefix with the index number of the list array. In most practical cases, you want to use more complex logic for suggestions of value, but you must be careful about performing very long and resource-intensive operations here. If you are planning to make database calls with intricate queries, make sure you have done ample testing to ensure its feasibility because the suggestions are useless if they take a long time to return. When you run this page in the browser, you can see the suggested terms three at a time as you type in the text box (see Figure 7-9).

For two fields, we have four different queries; for three fields, there would be eight different queries; in general for n fields, there would be 2n queries Of course, we also want to use bind variables for performance and scalability, so simply creating a query that concatenates the query field values into the where clause will not work We will look at two solutions for this problem the first is based on the PreparedStatement interface, and the second uses the CallableStatement interface..

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