Sqldatasource onupdating parameters
Entities are domain model classes which correlate to rows in a database table, using a unique identifier.Because of the requirement for a unique identifier, entities exist independently and define their own lifecycle.Or when a particular attribute does not explicitly name the database column that it maps to, we need to implicitly determine that column name. Hibernate provides a number of built-in basic types, which follow the natural mappings recommended by the JDBC specifications. JPA says that EAGER is a requirement to the provider (Hibernate) that the value should be fetched when the owner is fetched, while LAZY is merely a hint that the value be fetched when the attribute is accessed.There are examples of the role of the Many organizations define rules around the naming of database objects (tables, columns, foreign-keys, etc). Unlike the other value types, multiple instances of this type are registered. Hibernate ignores this setting for basic types unless you are using bytecode enhancement.While having a strong background in SQL is not required to use Hibernate, it certainly helps a lot because it all boils down to SQL statements.
However, none of these rules are hard requirements.
If JPA provider portability is important, applications should prefer not to specify a Physical Naming Strategy. String Utils; /** * An example Physical Naming Strategy that implements database object naming standards * for our fictitious company Acme Corp. JPA defines this as "a hint", which essentially means that it effect is specifically required.
When an entity does not explicitly name the database table that it maps to, we need to implicitly determine that table name. * Basic value types usually map a single database column, to a single, non-aggregated Java type. As long as the type is not primitive, Hibernate takes this to mean that the underlying column should be Defines whether this attribute should be fetched eagerly or lazily.
The idea of a Physical Naming Strategy is to help implement such naming rules without having to hard-code them into the mapping via explicit names. See the Bytecode Enhancement for additional information on fetching and on bytecode enhancement.
could have been handled in an Implicit Naming Strategy in this case. The Physical Naming Strategy will be applied regardless of whether the attribute explicitly specified the column name or whether we determined that implicitly. For basic type attributes, the implicit naming rule is that the column name is the same as the attribute name.