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ENTERPRISE JAVABEANS QUERY LANGUAGE
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not case sensitive and it cannot be the same as an EJB QL keyword (See the previous section for more naming rules) Also, within a given EJB JAR file, an identifier name must not match the name of any entity bean or abstract schema The clause may contain multiple declarations, separated by commas A declaration may reference another identification variable that has been previously declared (to the left) In the following clause, the variable references the previously declared variable :
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Even if an identification variable is not used in the clause, its declaration can affect the results of the query For an example, compare the next two queries The following query returns all players, whether or not they belong to a team:
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In contrast, because the next query declares the fetches all players that belong to a team:
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identification variable, it
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The following query returns the same results as the preceding query, but the clause makes it easier to read:
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An identification variable always designates a reference to a single value, whose type is that of the expression used in the declaration There are two kinds of declarations: range variable and collection member Range Variable Declarations To declare an identification variable as an abstract schema type, you specify a range variable declaration In other words, an identification variable can range over the abstract schema type of an entity bean In the following example, an : identification variable named represents the abstract schema named
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In most cases, to obtain objects a query navigates through the relationships with path expressions But for those objects that cannot be obtained by navigation, you can use a range variable declaration to designate a starting point (or root) If the query compares multiple values of the same abstract schema type, then the clause must declare multiple identification variables for the abstract schema:
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For a sample of such a query, see Example 9 (page 171) Collection Member Declarations In a one-to-many relationship, the multiple side consists of a collection of entity beans An identification variable may represent a member of this collection To access a collection member, the path expression in the variable s declaration navigates through the relationships in the abstract schema (For more information on path expressions, see the following section) Because a path expression may be based on another path expression, the navigation can traverse several relationships See Example 6 (page 170)
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A collection member declaration must include the the optional operator
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In the following example, the entity bean represented by the abstract schema named has a relationship field called The identification variable named represents a single member of the collection
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Path Expressions
Path expressions are important constructs in the syntax of EJB QL, for several reasons First, they define navigation paths through the relationships in the abstract schema These path definitions affect both the scope and the results of a query Second, they may appear in any of the three main clauses of an EJB QL query ( , , ) Finally, although much of EJB QL is a subset of SQL, path expressions are extensions not found in SQL
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operator, but it may omit
ENTERPRISE JAVABEANS QUERY LANGUAGE
Syntax
There are two types of path expressions: single-valued and collection-valued Here is the syntax for path expressions:
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In the preceding diagram, the element represents a persistent field, and the element designates a relationship field The term qualifies the relationship field as the single side of a one-to-one or one-to-many relationship; the term designates it as the multiple (collection) side of a relationship The period () in a path expression serves two functions If a period precedes a persistent field, it is a delimiter between the field and the identification variable If a period precedes a relationship field, it is a navigation operator