127 | Criteria Query From ElementsThe interfaces in this group are in use for setting a criteria query FROM clause. Criteria Query Variables The FROM clause in JPA queries (as in SQL) defines the query variables. Query variables are represented in criteria queries by descendant interfaces of the From interface: Range variables |
126 | FROM clause (JPQL / Criteria API)The FROM clause declares query identification variables that represent iteration over objects in the database. A query identification variable is similar to a variable of a Java enhanced for loop in a program, since both are used for iteration over objects. Range Variables Range variables are query |
114 | JPA Query Structure (JPQL / Criteria) clause declares one or more query variables (also known as identification variables). Query variables are similar to loop variables in programming languages. Each query variable represents iteration over objects in the database. A query variable that is bound to an entity class is referred to as |
104 | JPA Criteria API Queries the built query. Then a Root instance is created to define a range variable in the FROM clause. Finally, the range variable, c, is also used in the SELECT clause as the query result expression ... The JPA Criteria API provides an alternative way for defining JPA queries, which is mainly useful |
101 | DELETE Queries in JPA/JPQL. Applying changes to the database by calling the commit method. JPQL DELETE queries provide an alternative way for deleting entity objects. Unlike SELECT queries, which are used to retrieve data from the database, DELETE queries do not retrieve data from the database, but when executed, delete specified |
100 | UPDATE SET Queries in JPA/JPQL. Applying changes to the database by calling the commit method. JPQL UPDATE queries provide an alternative way of updating entity objects. Unlike SELECT queries, which are used to retrieve data from the database, UPDATE queries do not retrieve data from the database, but when executed, update |
91 | JPA Queries variables, join and fetch): Other criteria query expressions (for all the query clauses): ... Queries are represented in JPA by the Query and TypedQuery interfaces: The JPA Query API section ... these interfaces to build and run JPQL queries. The TypedQuery interface (or alternatively the older Query |
17 | [ODB1] Chapter 7 - JDOQL Queries all the elements that can be used in a JDOQL query filter, except for parameters and variables ... queries with more than three parameters. 7.4 Query Variables There are two types of variables in JDOQL: Bound variables, whose main role is in querying collection fields Unbound variables, which serve |
9 | declareVariables(variables)Method javax.jdo.Query void declareVariables( String variables ) Declare the unbound variables to be used in the query. Variables might be used in the filter, and these variables must be declared with their type. The unbound variable declaration is a String containing one or more unbound variable |
9 | Constants.OPTION_UNCONSTRAINED_QUERY_VARIABLESStatic Field javax.jdo.Constants String OPTION_UNCONSTRAINED_QUERY_VARIABLES "javax.jdo.option.UnconstrainedQueryVariables" Since: JDO 2.1 See Also: PersistenceManagerFactory.supportedOptions() |
