Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.
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Logical operators in JPQL and in JPA criteria queries enable composition of complex JPQL boolean expressions out of simple JPQL boolean expressions. Logical Operators ObjectDB supports 2 sets of logical operators, as shown in the following table: Set 1 - JPQL / SQL Set 2 - Java / JDO AND && OR
] MEMBER [OF] and the [NOT] LIKE operator. Logical operators: AND, OR, NOT. In addition, JPA queries ... , isMember, isNotMember, size). Comparison expressions (equal, notEqual, gt, ge, lt, le, between, isNull, ...) Logical expressions (and, or, not, isTrue).
to <>. When at least one of the two operands is NULL, == and != implement the ordinary Java logic, in which, for example, null == null is true. All the other operators implement the SQL logic in which NULL represents an unknown value ... follow the logic of Java's equals, comparing the content rather than the identity. Date values
, which includes many operators (arithmetic operators, relational operators, logical operators ... ), cb.lt(c.get("area"), a) ) ); See the Logical Operators page for explanations on boolean
. Comparison operators (<, <=, >=, <>, =, !=, ==, BETWEEN, IS NULL). Logical operators (AND, OR, NOT
A JPA Persistence Unit is a logical grouping of user defined persistable classes (entity classes, embeddable classes and mapped superclasses) with related settings. Defining a persistence unit is optional when using ObjectDB, but required by JPA. persistence.xml Persistence units are defined in
expressions (equal, notEqual, gt, ge, lt, le, between, isNull, ...) Logical expressions (and, or, not
, double). Logical Operators Logical operators (&&, ||, !) generate complex boolean expressions
after this call are disallowed. This method is modified by the enhancer so that fields referenced can be used in the business logic of the method. Since: JDO 2.0
so that fields referenced can be used in the business logic of the method. Since: JDO 2.0