org.apache.hadoop.hive.metastore.txn.jdbc

Interface ParameterizedBatchCommand<T>

All Known Implementing Classes:

AddWriteIdsToMinHistoryCommand, AddWriteIdsToTxnToWriteIdCommand, InsertCompletedTxnComponentsCommand, InsertHiveLocksCommand, InsertTxnComponentsCommand

public interface ParameterizedBatchCommand<T>

Represents a parameterized batch command (for exmaple an UPDATE statement) as a Spring JdbcTemplate style parameterized query string (for example: UPDATE TBL SET COL1 = ? WHERE ID = ?), its parameters, and a result policy. The result policy is a Function<Integer, Boolean> function which must decide if the number of affected rows is acceptable or not. It is called for each result in the batch.

Please note that for batch command, named parameters cannot be used! (like UPDATE TBL SET COL1 = :value WHERE ID = :id)

Method Summary

Modifier and Type	Method and Description
String	getParameterizedQueryString(DatabaseProduct databaseProduct) The parameterized query string.
org.springframework.jdbc.core.ParameterizedPreparedStatementSetter<T>	getPreparedStatementSetter() Implementations must return a ParameterizedPreparedStatementSetter instance which will be responsible for setting the parameter values for all the items in the batch
List<T>	getQueryParameters() A List instance containing the required parameters for the query string.
Function<Integer,Boolean>	resultPolicy()

Method Detail

getParameterizedQueryString

String getParameterizedQueryString(DatabaseProduct databaseProduct)

The parameterized query string. It is allowed if the query has no parameters at all.

Parameters:

databaseProduct - A DatabaseProduct instance representing the type of the underlying HMS dabatabe.

Returns:

Returns the parameterized query string.

getQueryParameters

List<T> getQueryParameters()

A List instance containing the required parameters for the query string.

getPreparedStatementSetter

org.springframework.jdbc.core.ParameterizedPreparedStatementSetter<T> getPreparedStatementSetter()

Implementations must return a ParameterizedPreparedStatementSetter instance which will be responsible for setting the parameter values for all the items in the batch

resultPolicy

Function<Integer,Boolean> resultPolicy()

Returns:

Returns the result policy to be used to validate the number of affected rows.