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

Class MySQLDatabaseAdapter

java.lang.Object

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

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

All Implemented Interfaces:

DatabaseAdapter

public class MySQLDatabaseAdapter
extends GenericDatabaseAdapter

A generic database adapter that generates MySQL compatible SQL.

Constructor Summary

Constructors

Constructor and Description
MySQLDatabaseAdapter()

Method Summary

Modifier and Type	Method and Description
List<String>	getAlterTableStatements(String tableName, List<ColumnDescription> columnsToAdd, boolean quoteTableName, boolean quoteColumnNames)
String	getColumnQuoteString()
String	getDescription()
String	getInsertIgnoreStatement(String table, List<String> columnNames, Collection<String> uniqueKeyColumnNames) Returns an SQL INSERT_IGNORE statement - i.e.
String	getName()
String	getSQLForDataType(int sqlType)
String	getTableQuoteString()
int	getTimesToAddColumnObjectsForUpsert() Tells How many times the column values need to be inserted into the prepared statement.
String	getUpsertStatement(String table, List<String> columnNames, Collection<String> uniqueKeyColumnNames) Returns an SQL UPSERT statement - i.e.
boolean	supportsCreateTableIfNotExists()
boolean	supportsInsertIgnore() Tells whether this adapter supports INSERT_IGNORE.
boolean	supportsUpsert() Tells whether this adapter supports UPSERT.
String	unwrapIdentifier(String identifier) Returns a bare identifier string by removing wrapping escape characters from identifier strings such as table and column names.

Methods inherited from class org.apache.nifi.processors.standard.db.impl.GenericDatabaseAdapter

getSelectStatement, getSelectStatement

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, getCreateTableStatement, getTableAliasClause

Constructor Detail

MySQLDatabaseAdapter

public MySQLDatabaseAdapter()

Method Detail

getName

public String getName()

Specified by:

getName in interface DatabaseAdapter

Overrides:

getName in class GenericDatabaseAdapter

getDescription

public String getDescription()

Specified by:

getDescription in interface DatabaseAdapter

Overrides:

getDescription in class GenericDatabaseAdapter

unwrapIdentifier

public String unwrapIdentifier(String identifier)

Description copied from interface: DatabaseAdapter

Returns a bare identifier string by removing wrapping escape characters from identifier strings such as table and column names.

The default implementation of this method removes double quotes. If the target database engine supports different escape characters, then its DatabaseAdapter implementation should override this method so that such escape characters can be removed properly.

Parameters:

identifier - An identifier which may be wrapped with escape characters

Returns:

An unwrapped identifier string, or null if the input identifier is null

supportsUpsert

public boolean supportsUpsert()

Description copied from interface: DatabaseAdapter

Tells whether this adapter supports UPSERT.

Returns:

true if UPSERT is supported, false otherwise

supportsInsertIgnore

public boolean supportsInsertIgnore()

Description copied from interface: DatabaseAdapter

Tells whether this adapter supports INSERT_IGNORE.

Returns:

true if INSERT_IGNORE is supported, false otherwise

getTimesToAddColumnObjectsForUpsert

public int getTimesToAddColumnObjectsForUpsert()

Tells How many times the column values need to be inserted into the prepared statement. Some DBs (such as MySQL) need the values specified twice in the statement, some need only to specify them once.

Returns:

An integer corresponding to the number of times to insert column values into the prepared statement for UPSERT, or -1 if upsert is not supported.

getUpsertStatement

public String getUpsertStatement(String table,
                                 List<String> columnNames,
                                 Collection<String> uniqueKeyColumnNames)

Description copied from interface: DatabaseAdapter

Returns an SQL UPSERT statement - i.e. UPDATE record or INSERT if id doesn't exist.

There is no standard way of doing this so not all adapters support it - use together with DatabaseAdapter.supportsUpsert()!

Parameters:

table - The name of the table in which to update/insert a record into.

columnNames - The name of the columns in the table to add values to.

uniqueKeyColumnNames - The name of the columns that form a unique key.

Returns:

A String containing the parameterized jdbc SQL statement. The order and number of parameters are the same as that of the provided column list.

getInsertIgnoreStatement

public String getInsertIgnoreStatement(String table,
                                       List<String> columnNames,
                                       Collection<String> uniqueKeyColumnNames)

Description copied from interface: DatabaseAdapter

Returns an SQL INSERT_IGNORE statement - i.e. Ignore record or INSERT if id doesn't exist.

There is no standard way of doing this so not all adapters support it - use together with DatabaseAdapter.supportsInsertIgnore()!

Parameters:

table - The name of the table in which to ignore/insert a record into.

columnNames - The name of the columns in the table to add values to.

uniqueKeyColumnNames - The name of the columns that form a unique key.

Returns:

A String containing the parameterized jdbc SQL statement. The order and number of parameters are the same as that of the provided column list.

getTableQuoteString

public String getTableQuoteString()

getColumnQuoteString

public String getColumnQuoteString()

supportsCreateTableIfNotExists

public boolean supportsCreateTableIfNotExists()

getAlterTableStatements

public List<String> getAlterTableStatements(String tableName,
                                            List<ColumnDescription> columnsToAdd,
                                            boolean quoteTableName,
                                            boolean quoteColumnNames)

getSQLForDataType

public String getSQLForDataType(int sqlType)