org.firebirdsql.gds.ng.jna

Class JnaStatement

java.lang.Object

org.firebirdsql.gds.ng.AbstractFbStatement

org.firebirdsql.gds.ng.jna.JnaStatement

All Implemented Interfaces:

FbStatement, ExceptionListenable

public class JnaStatement
extends AbstractFbStatement

Implementation of FbStatement for native client access.

Since:

3.0

Author:

Mark Rotteveel

Field Summary

Fields inherited from class org.firebirdsql.gds.ng.AbstractFbStatement

exceptionListenerDispatcher, statementListenerDispatcher

Constructor Summary

Constructors

Constructor and Description
JnaStatement(JnaDatabase database)

Method Summary

Modifier and Type	Method and Description
protected XSQLDA	allocateXSqlDa(RowDescriptor rowDescriptor) Creates an XSQLDA, populates type information and allocates memory for the sqldata fields.
RowDescriptor	emptyRowDescriptor()
void	execute(RowValue parameters) Execute the statement.
void	fetchRows(int fetchSize) Requests this statement to fetch the next fetchSize rows.
protected void	free(int option) Frees the currently allocated statement (either close the cursor with ISCConstants.DSQL_close or drop the statement handle using ISCConstants.DSQL_drop.
JnaDatabase	getDatabase()
int	getDefaultSqlInfoSize()
int	getHandle()
int	getMaxSqlInfoSize()
byte[]	getSqlInfo(byte[] requestItems, int bufferLength) Request statement info.
JnaTransaction	getTransaction()
protected boolean	isValidTransactionClass(java.lang.Class<? extends FbTransaction> transactionClass) Method to decide if a transaction implementation class is valid for the statement implementation.
void	prepare(java.lang.String statementText) Prepare the statement text.
void	setCursorName(java.lang.String cursorName) Sets the named cursor name for this statement.
protected void	setFieldDescriptor(RowDescriptor fieldDescriptor) Sets the (result set) field descriptor.
protected void	setParameterDescriptor(RowDescriptor parameterDescriptor) Sets the parameter descriptor.
protected void	setXSqlDaData(XSQLDA xSqlDa, RowDescriptor rowDescriptor, RowValue parameters) Populates an XSQLDA from the row descriptor and parameter values.
protected RowValue	toRowValue(RowDescriptor rowDescriptor, XSQLDA xSqlDa) Converts the data from an XSQLDA to a RowValue.

Methods inherited from class org.firebirdsql.gds.ng.AbstractFbStatement

addExceptionListener, addStatementListener, checkStatementValid, close, closeCursor, closeCursor, createExecutionPlanProcessor, createSqlCountProcessor, ensureClosedCursor, finalize, getExecutionPlan, getFieldDescriptor, getParameterDescriptionInfoRequestItems, getParameterDescriptor, getSqlCounts, getSqlInfo, getState, getStatementInfoRequestItems, getStatementWarningCallback, getSynchronizationObject, getTransactionListener, getType, hasFields, hasSingletonResult, isAllRowsFetched, isPrepareAllowed, parseStatementInfo, queueRowData, removeExceptionListener, removeStatementListener, reset, reset, resetAll, setAllRowsFetched, setTransaction, setType, switchState, validateParameters

Methods inherited from class java.lang.Object

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

Constructor Detail

JnaStatement

public JnaStatement(JnaDatabase database)

Method Detail

setParameterDescriptor

protected void setParameterDescriptor(RowDescriptor parameterDescriptor)

Description copied from class: AbstractFbStatement

Sets the parameter descriptor.

Overrides:

setParameterDescriptor in class AbstractFbStatement

Parameters:

parameterDescriptor - Parameter descriptor

setFieldDescriptor

protected void setFieldDescriptor(RowDescriptor fieldDescriptor)

Description copied from class: AbstractFbStatement

Sets the (result set) field descriptor.

Overrides:

setFieldDescriptor in class AbstractFbStatement

Parameters:

fieldDescriptor - Field descriptor

free

protected void free(int option)
             throws java.sql.SQLException

Description copied from class: AbstractFbStatement

Frees the currently allocated statement (either close the cursor with ISCConstants.DSQL_close or drop the statement handle using ISCConstants.DSQL_drop.

Specified by:

free in class AbstractFbStatement

Parameters:

option - Free option

Throws:

java.sql.SQLException

isValidTransactionClass

protected boolean isValidTransactionClass(java.lang.Class<? extends FbTransaction> transactionClass)

Description copied from class: AbstractFbStatement

Method to decide if a transaction implementation class is valid for the statement implementation.

Eg a V10Statement will only work with an FbWireTransaction implementation.

Specified by:

isValidTransactionClass in class AbstractFbStatement

Parameters:

transactionClass - Class of the transaction

Returns:

true when the transaction class is valid for the statement implementation.

getDatabase

public JnaDatabase getDatabase()

Returns:

The database connection that created this statement

getHandle

public int getHandle()

Returns:

The Firebird statement handle identifier

getTransaction

public JnaTransaction getTransaction()

Specified by:

getTransaction in interface FbStatement

Overrides:

getTransaction in class AbstractFbStatement

Returns:

Transaction currently associated with this statement

prepare

public void prepare(java.lang.String statementText)
             throws java.sql.SQLException

Description copied from interface: FbStatement

Prepare the statement text.

If this handle is in state StatementState.NEW then it will first allocate the statement.

Parameters:

statementText - Statement text

Throws:

java.sql.SQLException - If a database access error occurs, or this statement is currently executing a query.

execute

public void execute(RowValue parameters)
             throws java.sql.SQLException

Description copied from interface: FbStatement

Execute the statement.

Parameters:

parameters - The list of parameter values to use for execution.

Throws:

java.sql.SQLException - When the number of type of parameters does not match the types returned by FbStatement.getParameterDescriptor(), a parameter value was not set, or when an error occurred executing this statement.

setXSqlDaData

protected void setXSqlDaData(XSQLDA xSqlDa,
                             RowDescriptor rowDescriptor,
                             RowValue parameters)

Populates an XSQLDA from the row descriptor and parameter values.

Parameters:

xSqlDa - XSQLDA

rowDescriptor - Row descriptor

parameters - Parameter values

allocateXSqlDa

protected XSQLDA allocateXSqlDa(RowDescriptor rowDescriptor)

Creates an XSQLDA, populates type information and allocates memory for the sqldata fields.

Parameters:

rowDescriptor - The row descriptor

Returns:

Allocated XSQLDA without data

toRowValue

protected RowValue toRowValue(RowDescriptor rowDescriptor,
                              XSQLDA xSqlDa)

Converts the data from an XSQLDA to a RowValue.

Parameters:

rowDescriptor - Row descriptor

xSqlDa - XSQLDA

Returns:

Row value

fetchRows

public void fetchRows(int fetchSize)
               throws java.sql.SQLException

Requests this statement to fetch the next fetchSize rows.

Fetched rows are not returned from this method, but sent to the registered StatementListener instances.

The JNA implementation ignores the specified fetchSize to prevent problems with - for example - positioned updates with named cursors. For the wire protocol that case is handled by the server ignoring the fetch size. Internally the native fetch will batch a number of records, but the number is outside our control.

Parameters:

fetchSize - Number of rows to fetch (must be > 0)

Throws:

java.sql.SQLException - For database access errors, when called on a closed statement, when no cursor is open or when the fetch size is not > 0.

getSqlInfo

public byte[] getSqlInfo(byte[] requestItems,
                         int bufferLength)
                  throws java.sql.SQLException

Description copied from interface: FbStatement

Request statement info.

Parameters:

requestItems - Array of info items to request

bufferLength - Response buffer length to use

Returns:

Response buffer

Throws:

java.sql.SQLException

getDefaultSqlInfoSize

public int getDefaultSqlInfoSize()

Returns:

The default size to use for the sql info buffer

getMaxSqlInfoSize

public int getMaxSqlInfoSize()

Returns:

The maximum size to use for the sql info buffer

setCursorName

public void setCursorName(java.lang.String cursorName)
                   throws java.sql.SQLException

Description copied from interface: FbStatement

Sets the named cursor name for this statement.

Parameters:

cursorName - Name of the cursor

Throws:

java.sql.SQLException - If this statement is closed, TODO: Other reasons (eg cursor open)?

emptyRowDescriptor

public final RowDescriptor emptyRowDescriptor()

Returns:

A potentially cached empty row descriptor for this statement or database.