未加载 QPSQL 驱动程序（Qt6、Postgres-13）答案

【问题标题】：QPSQL driver not loaded (Qt6, Postgres-13)未加载 QPSQL 驱动程序（Qt6、Postgres-13）
【发布时间】：2021-07-28 12:20:03
【问题描述】：

我尝试重复QPSQL driver not loaded Qt，但这对我没有帮助。我使用 x64 Postgresql 和我的 Qt 应用程序也是 x64

m_dataBase.addDatabase("QPSQL");
        m_dataBase.setHostName(g_hostName);
        m_dataBase.setPort(g_databasePort);
        m_dataBase.setDatabaseName(g_databaseName);
        m_dataBase.setUserName(g_userName);
        m_dataBase.setPassword(g_password);

        qInfo() << "drivers:" << m_dataBase.drivers();

        if( !m_dataBase.isDriverAvailable("QPSQL")) {
            qWarning() << "Driver QPSQL is not available";
        } else {
            qInfo() << "QPSQL is available";
        }

        if (m_dataBase.open()) {
            qInfo() << "Data base open SUCCESSFUL";
            return true;
        } else {
            qWarning() << "Data base does not open";
            qInfo() << "Last ERROR:" << m_dataBase.lastError().driverText();
        }

我启用了

qputenv("QT_DEBUG_PLUGINS", "1");

用于版本调试日志。我在 cmd 中更新 PATH 变量

SET PATH=D:\PostgresLib\lib;%PATH%
SET PATH=D:\PostgresLib\bin;%PATH%

在我看到输出之后：

[06/05/2021 10:28:13.305] DBG        line:  QFactoryLoader::QFactoryLoader() looking at "C:/Qt/6.0.3/mingw81_64/plugins/sqldrivers/qsqlpsql.dll"
[06/05/2021 10:28:13.306] WAR        line:  Found metadata in lib C:/Qt/6.0.3/mingw81_64/plugins/sqldrivers/qsqlpsql.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QPSQL"
        ]
    },
    "archreq": 0,
    "className": "QPSQLDriverPlugin",
    "debug": false,
    "version": 393216
}


[06/05/2021 10:28:13.306] DBG        line:  Got keys from plugin meta data QList("QPSQL")
[06/05/2021 10:28:13.306] DBG        line:  QFactoryLoader::QFactoryLoader() checking directory path "D:/Projects/Build/sqldrivers" ...
[06/05/2021 10:28:13.309] DBG        line:  loaded library "C:/Qt/6.0.3/mingw81_64/plugins/sqldrivers/qsqlpsql.dll"
[06/05/2021 10:28:13.309] INF   postgresdatabase.cpp    virtual bool PostgresDataBase::init() line:24   drivers: QList("QSQLITE", "QODBC", "QPSQL")
[06/05/2021 10:28:13.309] INF   postgresdatabase.cpp    virtual bool PostgresDataBase::init() line:29   QPSQL is available
[06/05/2021 10:28:13.309] WAR   postgresdatabase.cpp    virtual bool PostgresDataBase::init() line:36   Data base does not open

【问题讨论】：

标签： qt postgresql-13 qt6

【解决方案1】：

问题出在非初始化对象 QSqlDatabase m_dataBase; 使固定：而不是这个字符串

m_dataBase.addDatabase("QPSQL");

我用

m_dataBase = QSqlDatabase::addDatabase("QPSQL");

【讨论】：