Package com.sap.cds.jdbc.postgresql

Class PostgreSqlStatementResolver

java.lang.Object

com.sap.cds.jdbc.postgresql.PostgreSqlStatementResolver

All Implemented Interfaces:

StatementResolver

public class PostgreSqlStatementResolver
extends Object
implements StatementResolver

Constructor Summary

Constructors

Constructor	Description
PostgreSqlStatementResolver()

Method Summary

Modifier and Type	Method	Description
String	deleteAll(String tableName)
String	lockMode(CqnLock.Mode mode)
Optional<String>	timeoutClause(int timeoutSeconds)
String	upsert(String table, Stream<String> keyColumns, Stream<String> upsertColumns, Stream<String> upsertValues)	PostgreSQL: INSERT INTO with ON CONFLICT DO UPDATE ON CONFLICT can be used to specify an alternative action to raising a unique constraint or exclusion constraint violation error.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.sap.cds.jdbc.spi.StatementResolver

collate, collate, hints, lockClause, preOptimize, statementWideCollation, supportsStatementWideCollation

Constructor Details

PostgreSqlStatementResolver

public PostgreSqlStatementResolver()

Method Details

upsert

public String upsert(String table,
 Stream<String> keyColumns,
 Stream<String> upsertColumns,
 Stream<String> upsertValues)

PostgreSQL: INSERT INTO with ON CONFLICT DO UPDATE ON CONFLICT can be used to specify an alternative action to raising a unique constraint or exclusion constraint violation error. For each individual row proposed for insertion, either the insertion proceeds, or, if an arbiter constraint or index specified by conflict_target is violated, the alternative conflict_action is taken. ON CONFLICT DO UPDATE updates the existing row that conflicts with the row proposed for insertion as its alternative action. ON CONFLICT DO UPDATE guarantees an atomic INSERT or UPDATE outcome; provided there is no independent error, one of those two outcomes is guaranteed, even under high concurrency. This is also known as UPSERT — “UPDATE or INSERT”. https://www.postgresql.org/docs/current/sql-insert.html#SQL-ON-CONFLICT

Specified by:

upsert in interface StatementResolver

lockMode

public String lockMode(CqnLock.Mode mode)

Specified by:

lockMode in interface StatementResolver

timeoutClause

public Optional<String> timeoutClause(int timeoutSeconds)

Specified by:

timeoutClause in interface StatementResolver

deleteAll

public String deleteAll(String tableName)

Specified by:

deleteAll in interface StatementResolver