# QSqlError Class Reference
## [[QtSql](index.htm) module]
该QSqlError类提供了SQL数据库的错误信息。[More...](#details)
### Types
* `enum ErrorType { NoError, ConnectionError, StatementError, TransactionError, UnknownError }`
### Methods
* `__init__ (self, QString driverText = QString(), QString databaseText = QString(), ErrorType type = QSqlError.NoError, int number = -1)`
* `__init__ (self, QSqlError other)`
* `QString databaseText (self)`
* `QString driverText (self)`
* `bool isValid (self)`
* `int number (self)`
* `setDatabaseText (self, QString databaseText)`
* `setDriverText (self, QString driverText)`
* `setNumber (self, int number)`
* `setType (self, ErrorType type)`
* `QString text (self)`
* `ErrorType type (self)`
* * *
## Detailed Description
该QSqlError类提供了SQL数据库的错误信息。
一个QSqlError对象可以提供数据库特定的错误数据，包括[driverText](qsqlerror.html#driverText)（）和[databaseText](qsqlerror.html#databaseText)（）消息（或两者连接在一起为[text](qsqlerror.html#text)（）），和错误[number](qsqlerror.html#number)（）和[type](qsqlerror.html#type)（ ） 。该功能都有setter方法，使您可以创建和从你自己的类返回QSqlError对象，例如，从您自己的SQL驱动程序。
* * *
## Type Documentation
```
QSqlError.ErrorType
```
该枚举类型描述了发生错误的情况下，例如，一个连接错误，语句错误等。
| Constant | Value | Description |
| --- | --- | --- |
| `QSqlError.NoError` | `0` | 未发生错误。 |
| `QSqlError.ConnectionError` | `1` | 连接错误。 |
| `QSqlError.StatementError` | `2` | SQL语句的语法错误。 |
| `QSqlError.TransactionError` | `3` | 交易失败的错误。 |
| `QSqlError.UnknownError` | `4` | 未知错误。 |
* * *
## Method Documentation
```
QSqlError.__init__ (self, QString driverText = QString(), QString databaseText = QString(), ErrorType type = QSqlError.NoError, int number = -1)
```
构造一个包含驱动程序错误文本错误_driverText_，数据库的特定错误文本_databaseText_，类型_type_和可选的错误号_number_。
```
QSqlError.__init__ (self, QSqlError other)
```
创建副本_other_。
```
QString QSqlError.databaseText (self)
```
所报告的数据库返回的错误的文本。这可能包含数据库的特定说明，它可能是空的。
**See also** [setDatabaseText](qsqlerror.html#setDatabaseText)（ ）[driverText](qsqlerror.html#driverText)（）和[text](qsqlerror.html#text)（ ） 。
```
QString QSqlError.driverText (self)
```
所报告的驱动程序返回错误的文本。这可能包含数据库的特定说明。它也可能是空的。
**See also** [setDriverText](qsqlerror.html#setDriverText)（ ）[databaseText](qsqlerror.html#databaseText)（）和[text](qsqlerror.html#text)（ ） 。
```
bool QSqlError.isValid (self)
```
返回True如果设置错误，否则为False 。
例如：
```
[QSqlQueryModel](qsqlquerymodel.html) model;
model.setQuery("select * from myTable");
if (model.lastError().isValid())
qDebug() << model.lastError();
```
**See also** [type](qsqlerror.html#type)（ ） 。
```
int QSqlError.number (self)
```
返回数据库特定的错误号或-1 ，如果它不能确定。
**See also** [setNumber](qsqlerror.html#setNumber)（ ） 。
```
QSqlError.setDatabaseText (self, QString databaseText)
```
设置数据库错误文本的价值_databaseText_。
**See also** [databaseText](qsqlerror.html#databaseText)（ ）[setDriverText](qsqlerror.html#setDriverText)（）和[text](qsqlerror.html#text)（ ） 。
```
QSqlError.setDriverText (self, QString driverText)
```
设置驱动器的错误文本的价值_driverText_。
**See also** [driverText](qsqlerror.html#driverText)（ ）[setDatabaseText](qsqlerror.html#setDatabaseText)（）和[text](qsqlerror.html#text)（ ） 。
```
QSqlError.setNumber (self, int number)
```
设置数据库特定的错误号码_number_。
**See also** [number](qsqlerror.html#number)（ ） 。
```
QSqlError.setType (self, ErrorType type)
```
设置错误类型的值_type_。
**See also** [type](qsqlerror.html#type)（ ） 。
```
QString QSqlError.text (self)
```
这是一个方便的函数，返回[databaseText](qsqlerror.html#databaseText)（）和[driverText](qsqlerror.html#driverText)（ ）连接成一个字符串。
**See also** [driverText](qsqlerror.html#driverText)（）和[databaseText](qsqlerror.html#databaseText)（ ） 。
```
ErrorType QSqlError.type (self)
```
[
如果返回的类型无法确定错误类型，或-1 。
](qsqlerror.html#ErrorType-enum)
[**See also**](qsqlerror.html#ErrorType-enum) [setType](qsqlerror.html#setType)（ ） 。
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