# Poco::Data::ODBC

# class SessionImpl

Library: Data/ODBC
Package: ODBC
Header: Poco/Data/ODBC/SessionImpl.h

## Description

Implements SessionImpl interface

## Inheritance

Direct Base Classes: Poco::Data::AbstractSessionImpl < SessionImpl >

All Base Classes: Poco::Data::AbstractSessionImpl < SessionImpl >

## Member Summary

Member Functions: autoBind, autoCommit, autoExtract, begin, canTransact, close, commit, connectorName, createStatementImpl, dataTypeInfo, dbc, getConnectionTimeout, getMaxFieldSize, getQueryTimeout, getTransactionIsolation, hasTransactionIsolation, isAutoBind, isAutoCommit, isAutoExtract, isConnected, isTransaction, isTransactionIsolation, maxStatementLength, open, queryTimeout, rollback, setConnectionTimeout, setMaxFieldSize, setQueryTimeout, setTransactionIsolation

## Enumerations

### TransactionCapability

ODBC_TXN_CAPABILITY_UNKNOWN = - 1

ODBC_TXN_CAPABILITY_FALSE = 0

ODBC_TXN_CAPABILITY_TRUE = 1

## Constructors

### SessionImpl

SessionImpl(
const std::string & connect,
std::size_t loginTimeout,
std::size_t maxFieldSize = ODBC_MAX_FIELD_SIZE,
bool autoBind = true,
bool autoExtract = true
);

Creates the SessionImpl. Opens a connection to the database. Throws NotConnectedException if connection was not succesful.

### SessionImpl

SessionImpl(
const std::string & connect,
Poco::Any maxFieldSize = ODBC_MAX_FIELD_SIZE,
bool enforceCapability = false,
bool autoBind = true,
bool autoExtract = true
);

Deprecated. This function is deprecated and should no longer be used.

Creates the SessionImpl. Opens a connection to the database.

## Destructor

### ~SessionImpl

~SessionImpl();

Destroys the SessionImpl.

## Member Functions

### autoBind

void autoBind(
const std::string & param26,
bool val
);

Sets automatic binding for the session.

### autoCommit

void autoCommit(
const std::string & param25,
bool val
);

Sets autocommit property for the session.

### autoExtract

void autoExtract(
const std::string & param27,
bool val
);

Sets automatic extraction for the session.

### begin

void begin();

Starts a transaction

### canTransact

bool canTransact();

Returns true if connection is transaction-capable.

### close

void close();

Closes the connection

### commit

void commit();

Commits and ends a transaction

### connectorName

const std::string & connectorName() const;

Returns the name of the connector.

### createStatementImpl

Poco::Data::StatementImpl * createStatementImpl();

Returns an ODBC StatementImpl

### dataTypeInfo

Poco::Any dataTypeInfo(
const std::string & rName = ""
);

Returns the data types information.

### dbc

const ConnectionHandle & dbc() const;

Returns the connection handle.

### getConnectionTimeout

std::size_t getConnectionTimeout();

Returns the session connection timeout value.

### getMaxFieldSize

Poco::Any getMaxFieldSize(
const std::string & rName = ""
);

Returns the max field size (the default used when column size is unknown).

### getQueryTimeout

Poco::Any getQueryTimeout(
const std::string & param29
);

Returns the timeout (in seconds) for queries, or -1 if no timeout has been set.

### getTransactionIsolation

Poco::UInt32 getTransactionIsolation();

Returns the transaction isolation level.

### hasTransactionIsolation

bool hasTransactionIsolation(
Poco::UInt32
);

Returns true if and only if the transaction isolation level corresponding to the supplied bitmask is supported.

### isAutoBind

bool isAutoBind(
const std::string & name = ""
);

Returns true if binding is automatic for this session.

### isAutoCommit

bool isAutoCommit(
const std::string & name = ""
);

Returns autocommit property value.

### isAutoExtract

bool isAutoExtract(
const std::string & name = ""
);

Returns true if extraction is automatic for this session.

### isConnected

bool isConnected();

Returns true if session is connected

### isTransaction

bool isTransaction();

Returns true if and only if a transaction is in progress.

### isTransactionIsolation

bool isTransactionIsolation(
Poco::UInt32
);

Returns true if and only if the transaction isolation level corresponds to the supplied bitmask.

### maxStatementLength

int maxStatementLength();

Returns maximum length of SQL statement allowed by driver.

### open

void open(
const std::string & connect = ""
);

Opens a connection to the Database

### queryTimeout

int queryTimeout() const;

Returns the timeout (in seconds) for queries, or -1 if no timeout has been set.

### rollback

void rollback();

Aborts a transaction

### setConnectionTimeout

void setConnectionTimeout(
std::size_t timeout
);

Sets the session connection timeout value.

### setMaxFieldSize

void setMaxFieldSize(
const std::string & rName,
const Poco::Any & rValue
);

Sets the max field size (the default used when column size is unknown).

### setQueryTimeout

void setQueryTimeout(
const std::string & param28,
const Poco::Any & value
);

Sets the timeout (in seconds) for queries. Value must be of type int.

### setTransactionIsolation

void setTransactionIsolation(
Poco::UInt32 ti
);

Sets the transaction isolation level.

## Variables

### ODBC_MAX_FIELD_SIZE

static const std::size_t ODBC_MAX_FIELD_SIZE = 1024u;