persistence.xml

Property

Description

com.sap.jpa.sql.mapping

Setting this property, you can control the JPA calculation of the SQL statements that are sent to the database.

The possible values are:

• cached - JPA caches SQL statements dynamically.

• precomputed - JPA computes the SQL statements eagerly, upon the entity manager factory creation. This option eliminates the computation time of the SQL mapper results, but consumes slightly more memory.

com.sap.jpa.identity.generator.tablename

This property specifies the name of the table used for automatic ID generation with the TABLE strategy.

For more information, see Generated Primary Keys .

com.sap.jpa.versioning.generator.tablename

When you are working with the system DataSource, which has a default isolation level read_uncommitted , and you are using versioned entities, you can set this property to specify a table name to be used by the version generator.

For more information, see Versioning and Dirty Reads .

com.sap.jpa.versioning.generator.allocation-size

When you are using versioning, you can specify the allocation size of the version generator using this property.

For more information, see Versioning and Dirty Reads .

com.sap.jpa.execution.foreign-key-handling

Setting this property, you specify the strategy to be used for handling foreign key constraints on the database.

The possible value is:

• topological

For more information, see Native Databases with Foreign Key Constraints .

com.sap.jpa.cache.read-only-classes

Using this property, you declare read-only entities.

For more information, see Caches in the JPA Implementation .

The value of this property is a comma-separated list of the fully qualified class names of the entities that are read-only.

com.sap.jpa.cache.cacheable-classes

Using this property, you declare cacheable entities.

For more information, see Caches in the JPA Implementation .

The value of this property is a comma-separated list of the fully qualified class names of the entities that are cacheable.

com.sap.jpa.cache.object-cache.size

You use this property to change the default maximum size of the entity cache.

For more information, see Caches in the JPA Implementation

com.sap.jpa.cache.query-result-cache.size

You use this property to change the default maximum size of the query result cache.

For more information, see Caches in the JPA Implementation .

com.sap.jpa.cache.query-result-cache.time-to-live

When working with JPA caches, you can use this property to specify the time-to-live in seconds of a cached query.

For more information, see Caches in the JPA Implementation .

com.sap.jpa.compliance.sap-product-standard

This property enables/disables the SAP Product Standard Compliance check.

The possible values are:

• true

• false

Enabling this property prevents the usage of the Entity cache and the Query Result cache.

For more information, see Caches in the JPA Implementation .

SAP Note 1169694

com.sap.jpa.query.max-en-bloc-size

Specifies the maximum number of related entities to be loaded en-bloc. If this property is not set, the default value applies ( 50 ). To switch off en-bloc loading, set this property to 1 .

com.sap.jpa.execution.generate-proxies

Specifying the value of this property to true enables generation of proxy classes used for lazy loading of entities.

For more information, see Lazy-Loading Entities with Single-Valued Relationships .