birt barcode tool Introducing JPQL in Java

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Introducing JPQL
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Using a range with BETWEEN You can use the BETWEEN operator in an arithmetic expression to compare a variable with a range of values. You can also use the BETWEEN operator in arithmetic, string, or DATETIME expressions to compare a path expression to a lower and upper limit using the following syntax:
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path_expression [NOT] BETWEEN lowerRange and upperRange
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Suppose you want to filter the results so that categoryId falls within a specified range. You can use a WHERE clause and named parameters for the range this way:
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WHERE c.categoryId BETWEEN :lowRange AND :highRange
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The lower and upper range used in a BETWEEN operator must be the same data type.
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Using the IN operator The IN operator allows you to create a conditional expression based on whether a path expression exists in a list of values. Here is the syntax for the IN operator:
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path_expression [NOT] IN (List_of_values)
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The list of values can be a static list of comma-separated values, or a dynamic list retrieved by a subquery. Suppose you want to retrieve the results for userId that exist in a static list of userIds. This WHERE clause will do the trick:
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WHERE u.userId IN ('viper', 'drdba', 'dumpster')
If you want to retrieve the information from users that do not exist in the same static list, then you can use this WHERE clause:
WHERE u.userId NOT IN ('viper', 'drdba', 'dumpster')
A subquery is a query within a query. A subquery may return a single or multiple values. You ll learn more about subqueries in section 10.3.8. Let s review an example of a subquery with an IN operator:
WHERE c.user IN (SELECT u FROM User u WHERE u.userType = 'A')
In this expression you are trying to evaluate the User field with a list of users retrieved by the subquery. When a query contains a subquery, the subquery is executed first, and then the parent query is evaluated against the result retrieved by the subquery.
Using the query API and JPQL to retrieve entities
Using the LIKE operator The LIKE operator allows you to determine whether a single-value path expression matches a string pattern. The syntax for the LIKE operator is
string_value_path_expression [NOT] LIKE pattern_value_
Here pattern_value is a string literal or an input parameter. The pattern_value may contain an underscore (_) or a percent sign (%). The underscore stands for a single character. Consider the following clause:
WHERE c.itemName LIKE '_ike'
This expression will return true when c.itemName has values such as mike, bike, and so forth. You should be able to extend this technique to embed a space into any search string, effectively making the space a wildcard. If you search for a single space, it will only match a single character. The percent sign (%) represents any numbers of characters. Whenever you want to search for all Category entities with a name that starts with Recycle, use this WHERE clause:
WHERE c.categoryName LIKE 'Recycle%'
The expression will return true when c.categoryName has values such as Recycle from Garbage, Recycle from Mr. Dumpster, and RecycleMania the Hulkster strikes again!. Suppose you want to retrieve a result set in which a string expression does not match a literal. You can use the NOT operator in conjunction with the LIKE operator as in the following example:
WHERE c.categoryName NOT LIKE '%Recycle%'
The expression will return false when c.categoryName has any values that includes Recycle as any part of the return value, because in this example you used % before and after the filter string. Some examples that match this situation are Dr. T will Recycle your face and Recycle from the Garbage, it's the American Way. In most applications you probably want to supply a parameter for flexibility rather than use a string literal. You can use positional parameters as shown here to accomplish this:
WHERE c.categoryName NOT LIKE 1
Here, the result set will contain all c.categoryNames that are not like values bound to the positional parameter 1.
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