Package com.ibm.fhir.persistence.jdbc.postgres

Class PostgresResourceNoProcDAO

java.lang.Object

com.ibm.fhir.persistence.jdbc.dao.impl.FHIRDbDAOImpl

com.ibm.fhir.persistence.jdbc.dao.impl.ResourceDAOImpl

com.ibm.fhir.persistence.jdbc.postgres.PostgresResourceNoProcDAO

All Implemented Interfaces:

FHIRDbDAO, ResourceDAO

public class PostgresResourceNoProcDAO
extends ResourceDAOImpl

Data access object for writing FHIR resources to a PostgreSQL database. Like the Derby implementation, this version uses individual SQL statements instead of a stored procedure and is useful for debugging performance and/or concurrency issues. It should not be used in production scenarios because the numerous app-database round-trips slow things down considerably.

Field Summary

Fields inherited from class com.ibm.fhir.persistence.jdbc.dao.impl.ResourceDAOImpl

DEFAULT_VALUE_REINDEX_TSTAMP

Constructor Summary

Constructors

Constructor	Description
PostgresResourceNoProcDAO(Connection connection, String schemaName, FHIRDbFlavor flavor, FHIRPersistenceJDBCCache cache, IResourceReferenceDAO rrd)
PostgresResourceNoProcDAO(Connection connection, String schemaName, FHIRDbFlavor flavor, TransactionSynchronizationRegistry trxSynchRegistry, FHIRPersistenceJDBCCache cache, IResourceReferenceDAO rrd, ParameterTransactionDataImpl ptdi)

Method Summary

Modifier and Type	Method	Description
protected void	deleteFromParameterTable(Connection conn, String tableName, long logicalResourceId)	Delete all parameters for the given resourceId from the parameters table
int	getOrCreateResourceType(String resourceTypeName, Connection conn)	stored-procedure-less implementation for managing the resource_types table
protected Integer	getResourceTypeId(String resourceTypeName, Connection conn)	Read the id for the named type
Resource	insert(Resource resource, List<ExtractedParameterValue> parameters, ParameterDAO parameterDao)	Inserts the passed FHIR Resource and associated search parameters to a Derby or PostgreSql FHIR database.
Integer	readResourceTypeId(String resourceType)	Reads the id associated with the name of the passed Resource type from the Resource_Types table.
long	storeResource(String tablePrefix, List<ExtractedParameterValue> parameters, String p_logical_id, byte[] p_payload, Timestamp p_last_updated, boolean p_is_deleted, String p_source_key, Integer p_version, Connection conn, ParameterDAO parameterDao)	Store the resource in the database, creating a new logical_resource entry if this is the first version of this resource, or creating a new resource entry if this a new version of an existing logical resource.

Methods inherited from class com.ibm.fhir.persistence.jdbc.dao.impl.ResourceDAOImpl

addResourceTypeCacheCandidate, createDTO, getCache, getResourceReferenceDAO, getResourceTypeIdFromCaches, getSearchByIdsSql, getTransactionData, history, historyCount, read, readAllResourceTypeNames, search, search, searchByIds, searchCount, searchCount, searchForIds, searchStringValues, setPersistenceContext, versionRead

Methods inherited from class com.ibm.fhir.persistence.jdbc.dao.impl.FHIRDbDAOImpl

buildExceptionWithIssue, buildFHIRPersistenceDBConnectException, cleanup, cleanup, createDTOs, getConnection, getFlavor, getSchemaName, isDb2Database, runCountQuery, runQuery, runQuery_STR_VALUES, severe, severe

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.ibm.fhir.persistence.jdbc.dao.api.FHIRDbDAO

getConnection, getFlavor, isDb2Database

Constructor Detail

PostgresResourceNoProcDAO

public PostgresResourceNoProcDAO(Connection connection,
                                 String schemaName,
                                 FHIRDbFlavor flavor,
                                 FHIRPersistenceJDBCCache cache,
                                 IResourceReferenceDAO rrd)

PostgresResourceNoProcDAO

public PostgresResourceNoProcDAO(Connection connection,
                                 String schemaName,
                                 FHIRDbFlavor flavor,
                                 TransactionSynchronizationRegistry trxSynchRegistry,
                                 FHIRPersistenceJDBCCache cache,
                                 IResourceReferenceDAO rrd,
                                 ParameterTransactionDataImpl ptdi)

Method Detail

insert

public Resource insert(Resource resource,
                       List<ExtractedParameterValue> parameters,
                       ParameterDAO parameterDao)
                throws FHIRPersistenceException

Inserts the passed FHIR Resource and associated search parameters to a Derby or PostgreSql FHIR database. The search parameters are stored first by calling the passed parameterDao. Then the Resource is stored by sql.

Specified by:

insert in interface ResourceDAO

Overrides:

insert in class ResourceDAOImpl

Parameters:

resource - The FHIR Resource to be inserted.

parameters - The Resource's search parameters to be inserted.

parameterDao -

Returns:

The Resource DTO

Throws:

FHIRPersistenceDataAccessException

FHIRPersistenceDBConnectException

FHIRPersistenceVersionIdMismatchException

FHIRPersistenceException

storeResource

public long storeResource(String tablePrefix,
                          List<ExtractedParameterValue> parameters,
                          String p_logical_id,
                          byte[] p_payload,
                          Timestamp p_last_updated,
                          boolean p_is_deleted,
                          String p_source_key,
                          Integer p_version,
                          Connection conn,
                          ParameterDAO parameterDao)
                   throws Exception

Store the resource in the database, creating a new logical_resource entry if this is the first version of this resource, or creating a new resource entry if this a new version of an existing logical resource. The logic tracks closely the DB2 stored procedure implementation, including locking of the logical_resource and handling concurrency issues using the standard insert-or-update pattern:

   SELECT FOR UPDATE                 -- try and get a write lock
   IF NOT FOUND THEN                 -- doesn't exist, so we don't have a lock
     INSERT new logical resource     -- create the record - if OK, we own the lock
     IF DUPLICATE THEN               -- someone else beat us to the create
       SELECT FOR UPDATE             -- so we need to try again for a write lock
     ...
   ...
 

This works because we never delete a logical_resource record, and so don't have to deal with concurrency issues caused when deletes are mingled with inserts/updates Note the execution flow aligns very closely with the DB2 stored procedure implementation (fhir-persistence-schema/src/main/resources/add_any_resource.sql)

Parameters:

tablePrefix -

parameters -

p_logical_id -

p_payload -

p_last_updated -

p_is_deleted -

p_source_key -

p_version -

Returns:

the resource_id for the entry we created

Throws:

Exception

deleteFromParameterTable

protected void deleteFromParameterTable(Connection conn,
                                        String tableName,
                                        long logicalResourceId)
                                 throws SQLException

Delete all parameters for the given resourceId from the parameters table

Parameters:

conn -

tableName -

logicalResourceId -

Throws:

SQLException

getResourceTypeId

protected Integer getResourceTypeId(String resourceTypeName,
                                    Connection conn)
                             throws SQLException

Read the id for the named type

Parameters:

resourceTypeName -

Returns:

the database id, or null if the named record is not found

Throws:

SQLException

getOrCreateResourceType

public int getOrCreateResourceType(String resourceTypeName,
                                   Connection conn)
                            throws SQLException

stored-procedure-less implementation for managing the resource_types table

Parameters:

resourceTypeName -

Throws:

SQLException

readResourceTypeId

public Integer readResourceTypeId(String resourceType)
                           throws FHIRPersistenceDBConnectException,
                                  FHIRPersistenceDataAccessException

Description copied from interface: ResourceDAO

Reads the id associated with the name of the passed Resource type from the Resource_Types table. If the id for the passed name is not present in the database, an id is generated, persisted, and returned.

Specified by:

readResourceTypeId in interface ResourceDAO

Overrides:

readResourceTypeId in class ResourceDAOImpl

Returns:

Integer - the id associated with the name of the passed Resource type.

Throws:

FHIRPersistenceDBConnectException

FHIRPersistenceDataAccessException