Qt之数据库编程

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一、问题一
QtCreator编译报错：
error: undefined reference to _imp___ZN12QSqlDatabase17defaultConnectionE' error: undefined reference toimp___ZN12QSqlDatabase11addDatabaseERK7QStringS2’
error: undefined reference to _imp___ZN12QSqlDatabase15setDatabaseNameERK7QString' error: undefined reference to_imp___ZN12QSqlDatabase11setHostNameERK7QString’
error: undefined reference to _imp___ZN12QSqlDatabase11setUserNameERK7QString' error: undefined reference to_imp___ZN12QSqlDatabase11setPasswordERK7QString’
error: undefined reference to _imp___ZN12QSqlDatabase4openEv' error: undefined reference to_imp___ZNK12QSqlDatabase9lastErrorEv’
error: undefined reference to _imp___ZNK9QSqlError4textEv' error: undefined reference to_imp___ZN9QSqlErrorD1Ev’
error: undefined reference to _imp___ZN12QSqlDatabaseD1Ev' error: undefined reference to_imp___ZN9QSqlErrorD1Ev’
error: undefined reference to `_imp___ZN12QSqlDatabaseD1Ev’
问题原因：在qt中使用了数据库，但是在它的项目文件中却没有相应的说明。
解决办法：在pro文件加入如下内容：QT += sql

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