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Our mildly complex SQL statement will receive an unknown quantity of category IDs from the categoryIds property of the CategorySearchCriteria. This will be used to populate the IN statement. The firstLetter property containing a single alpha character will be provided to perform the search against the first letter of the category name. In this example, our focus is on the JDBC interactions and comparing Dynamic SQL solutions. So, we will not expound on anything outside of that. Listing 8.15 shows how to build the Dynamic SQL using only Java code.

This may seem similar to concatenation, but the important difference is that the extended sequence (in this case, a) is modified. This is not the case in ordinary concatenation, in which a completely new sequence is returned: >>> >>> >>> [1, >>> [1, a = [1, 2, 3] b = [4, 5, 6] a + b 2, 3, 4, 5, 6] a 2, 3]

public class CategorySearchDao { public List searchCategory( CategorySearchCriteria categorySearchCriteria) { List retVal = new ArrayList();

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As you can see, the concatenated list looks exactly the same as the extended one in the previous example, yet a hasn t changed this time. Because ordinary concatenation must make a new list that contains copies of a and b, it isn t quite as efficient as using extend if what you want is something like this: >>> a = a + b Also, this isn t an in-place operation it won t modify the original. The effect of extend can be achieved by assigning to slices, as follows: >>> >>> >>> >>> [1, a = [1, 2, 3] b = [4, 5, 6] a[len(a):] = b a 2, 3, 4, 5, 6] While this works, it isn t quite as readable.

Execute the dir command to verify that your DSL Grammar, DSL, and schema files exist in this directory, and then compile the DSL Grammar code by entering the following command: m.exe LunchCounter.mg

try { Connection conn = ConnectionPool.getConnection("MyConnectionPool"); PreparedStatement ps = null; ResultSet rs = null; List valueList = new ArrayList(); StringBuffer sql = new StringBuffer(""); sql.append("SELECT * "); sql.append("FROM Category ");

dynamic part if(categorySearchCriteria.getCategoryIds() != null && categorySearchCriteria.getCategoryIds().size() > 0) {

The index method is used for searching lists to find the index of the first occurrence of a value: >>> knights = ['We', 'are', 'the', 'knights', 'who', 'say', 'ni'] >>> knights.index('who') 4 >>> knights.index('herring') Traceback (innermost last): File "<pyshell#76>", line 1, in knights.index('herring') ValueError: list.index(x): x not in list

Iterator categoryIdIt = categorySearchCriteria.getCategoryIds().iterator(); sql.append("WHERE "); sql.append("categoryId IN ("); if(categoryIdIt.hasNext()) { Object value = categoryIdIt.next(); valueList.add(value); sql.append(" "); } while(categoryIdIt.hasNext()) { Object value = categoryIdIt.next(); valueList.add(value); sql.append(", "); } sql.append(") "); } if(categorySearchCriteria.getFirstLetter() != null && !categorySearchCriteria.getFirstLetter().trim().equals("")) { Don t forget if(valueList.size() != 0) { the AND! sql.append("AND "); } sql.append("name LIKE ( )"); valueList.add(categorySearchCriteria.getFirstLetter() + "%");

and execute another dir command to be sure the compiler created the LunchCounter.mx image file (see Figure 3-35).

} ps = conn.prepareStatement(sql.toString()); Iterator valueListIt = valueList.iterator(); int indexCount = 1; while(valueListIt.hasNext()) { ps.setObject(indexCount,valueListIt.next()); indexCount++; }

When you search for the word 'who', you find that it s located at index 4: >>> knights[4] 'who' However, when you search for 'herring', you get an exception because the word is not found at all.

rs = ps.executeQuery();

The insert method is used to insert an object into a list: >>> >>> >>> [1, numbers = [1, 2, 3, 5, 6, 7] numbers.insert(3, 'four') numbers 2, 3, 'four', 5, 6, 7] As with extend, you can implement insert with slice assignments: >>> >>> >>> [1, numbers = [1, 2, 3, 5, 6, 7] numbers[3:3] = ['four'] numbers 2, 3, 'four', 5, 6, 7] This may be fancy, but it is hardly as readable as using insert.

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