Package org.apache.nifi.processors.standard.db.impl

Class GenericDatabaseAdapter

java.lang.Object

org.apache.nifi.processors.standard.db.impl.GenericDatabaseAdapter

All Implemented Interfaces:

DatabaseAdapter

Direct Known Subclasses:

DatabaseDialectServiceDatabaseAdapter, MySQLDatabaseAdapter, PostgreSQLDatabaseAdapter

public class GenericDatabaseAdapter
extends Object
implements DatabaseAdapter

A generic database adapter that generates ANSI SQL.

Constructor Summary

Constructors

Constructor	Description
GenericDatabaseAdapter()

Method Summary

Modifier and Type	Method	Description
String	getDescription()
String	getName()
String	getSelectStatement(String tableName, String columnNames, String whereClause, String orderByClause, Long limit, Long offset)	Returns a SQL SELECT statement with the given clauses applied.
String	getSelectStatement(String tableName, String columnNames, String whereClause, String orderByClause, Long limit, Long offset, String columnForPartitioning)	Returns a SQL SELECT statement with the given clauses applied.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.nifi.processors.standard.db.DatabaseAdapter

generateTableName, getAlterTableStatement, getAutoCommitForReads, getCreateTableStatement, getInsertIgnoreStatement, getSQLForDataType, getTableAliasClause, getUpsertStatement, supportsCreateTableIfNotExists, supportsInsertIgnore, supportsUpsert

Constructor Details

GenericDatabaseAdapter

public GenericDatabaseAdapter()

Method Details

getName

public String getName()

Specified by:

getName in interface DatabaseAdapter

getDescription

public String getDescription()

Specified by:

getDescription in interface DatabaseAdapter

getSelectStatement

public String getSelectStatement(String tableName,
 String columnNames,
 String whereClause,
 String orderByClause,
 Long limit,
 Long offset)

Description copied from interface: DatabaseAdapter

Returns a SQL SELECT statement with the given clauses applied.

Specified by:

getSelectStatement in interface DatabaseAdapter

Parameters:

tableName - The name of the table to fetch rows from

columnNames - The names of the columns to fetch from the table

whereClause - The filter to apply to the statement. This should not include the WHERE keyword

orderByClause - The columns/clause used for ordering the result rows. This should not include the ORDER BY keywords

limit - The value for the LIMIT clause (i.e. the number of rows to return)

offset - The value for the OFFSET clause (i.e. the number of rows to skip)

Returns:

A String containing a SQL SELECT statement with the given clauses applied

getSelectStatement

public String getSelectStatement(String tableName,
 String columnNames,
 String whereClause,
 String orderByClause,
 Long limit,
 Long offset,
 String columnForPartitioning)

Description copied from interface: DatabaseAdapter

Returns a SQL SELECT statement with the given clauses applied. Note that if this method is overridden, the other overloaded methods need to be overridden as well, to call this method with columnForPartitioning = false

Specified by:

getSelectStatement in interface DatabaseAdapter

Parameters:

tableName - The name of the table to fetch rows from

columnNames - The names of the columns to fetch from the table

whereClause - The filter to apply to the statement. This should not include the WHERE keyword

orderByClause - The columns/clause used for ordering the result rows. This should not include the ORDER BY keywords

limit - The value for the LIMIT clause (i.e. the number of rows to return)

offset - The value for the OFFSET clause (i.e. the number of rows to skip)

columnForPartitioning - The (optional) column name that, if provided, the limit and offset values are based on values from the column itself (rather than the row number)

Returns:

A String containing a SQL SELECT statement with the given clauses applied