內容

• 公共類型
• 公共函數
• 詳細描述

QSqlError Class

The QSqlError class provides SQL database error information. 更多...

頭：	#include <QSqlError>

• 所有成員列錶，包括繼承成員

公共類型

enum	ErrorType { NoError, ConnectionError, StatementError, TransactionError, UnknownError }

公共函數

	QSqlError (const QString & driverText = QString(), const QString & databaseText = QString(), ErrorType type = NoError, int number = -1)
	QSqlError (const QSqlError & other )
	~QSqlError ()
QString	databaseText () const
QString	driverText () const
bool	isValid () const
int	number () const
void	setDatabaseText (const QString & databaseText )
void	setDriverText (const QString & driverText )
void	setNumber (int number )
void	setType (ErrorType type )
QString	text () const
ErrorType	type () const
QSqlError &	operator= (const QSqlError & other )

詳細描述

The QSqlError class provides SQL database error information.

A QSqlError object can provide database-specific error data, including the driverText () 和 databaseText () messages (or both concatenated together as text ()), and the error number () 和 type (). The functions all have setters so that you can create and return QSqlError objects from your own classes, for example from your own SQL drivers.

另請參閱 QSqlDatabase::lastError () 和 QSqlQuery::lastError ().

成員類型文檔編製

enum QSqlError:: ErrorType

This enum type describes the context in which the error occurred, e.g., a connection error, a statement error, etc.

常量	值	描述
QSqlError::NoError	0	沒有齣現錯誤。
QSqlError::ConnectionError	1	Connection error.
QSqlError::StatementError	2	SQL statement syntax error.
QSqlError::TransactionError	3	Transaction failed error.
QSqlError::UnknownError	4	Unknown error.

成員函數文檔編製

QSqlError:: QSqlError (const QString & driverText = QString(), const QString & databaseText = QString(), ErrorType type = NoError, int number = -1)

Constructs an error containing the driver error text driverText , the database-specific error text databaseText , the type type and the optional error number number .

QSqlError:: QSqlError (const QSqlError & other )

創建副本為 other .

QSqlError:: ~QSqlError ()

銷毀對象並釋放任何分配資源。

QString QSqlError:: databaseText () const

Returns the text of the error as reported by the database. This may contain database-specific descriptions; it may be empty.

另請參閱 setDatabaseText (), driverText ()，和 text ().

QString QSqlError:: driverText () const

Returns the text of the error as reported by the driver. This may contain database-specific descriptions. It may also be empty.

另請參閱 setDriverText (), databaseText ()，和 text ().

bool QSqlError:: isValid () const

Returns true if an error is set, otherwise false.

範例：

QSqlQueryModel model;
model.setQuery("select * from myTable");
if (model.lastError().isValid())
    qDebug() << model.lastError();
					

另請參閱 type ().

int QSqlError:: number () const

Returns the database-specific error number, or -1 if it cannot be determined.

另請參閱 setNumber ().

void QSqlError:: setDatabaseText (const QString & databaseText )

Sets the database error text to the value of databaseText .

另請參閱 databaseText (), setDriverText ()，和 text ().

void QSqlError:: setDriverText (const QString & driverText )

Sets the driver error text to the value of driverText .

另請參閱 driverText (), setDatabaseText ()，和 text ().

void QSqlError:: setNumber ( int number )

Sets the database-specific error number to number .

另請參閱 number ().

void QSqlError:: setType ( ErrorType type )

Sets the error type to the value of type .

另請參閱 type ().

QString QSqlError:: text () const

This is a convenience function that returns databaseText () 和 driverText () concatenated into a single string.

另請參閱 driverText () 和 databaseText ().

ErrorType QSqlError:: type () const

Returns the error type, or -1 if the type cannot be determined.

另請參閱 setType ().

QSqlError & QSqlError:: operator= (const QSqlError & other )

賦值 other error's values to this error.