qt编译oracle驱动，qt 5.12 连接 oracle 数据库示例代码

qt 5.12.5 编译 oracle11g R2 驱动

1. 下载安装oracle客户端 oracle11g R2 64位
2. 安装qt 5.12
   
3. D:\alantop_sde\Qt\5.12.5\Src\qtbase\src\plugins\sqldrivers\oci
   打开 oci.pro

TARGET = qsqloci

HEADERS += $$PWD/qsql_oci_p.h
SOURCES += $$PWD/qsql_oci.cpp $$PWD/main.cpp

#QMAKE_USE += oci

darwin:QMAKE_LFLAGS += -Wl,-flat_namespace,-U,_environ

OTHER_FILES += oci.json

PLUGIN_CLASS_NAME = QOCIDriverPlugin
include(../qsqldriverbase.pri)

QMAKE_LFLAGS += D:/oracle11g/product/11.2.0/client_1\BIN/oci.dll
INCLUDEPATH += D:/oracle11g/product/11.2.0/client_1/oci/include
LIBPATH += D:/oracle11g/product/11.2.0/client_1/oci/lib/msvc

#QMAKE_USE += oci
QMAKE_LFLAGS += D:/oracle11g/product/11.2.0/client_1\BIN/oci.dll
INCLUDEPATH += D:/oracle11g/product/11.2.0/client_1/oci/include
LIBPATH += D:/oracle11g/product/11.2.0/client_1/oci/lib/msvc

操作系统，数据库，编译器都选择64为的 使用MinGw64

编译出现错误，修改源码

修改2个地方 修改源码 qsql_oci.cpp 1599行
1. 修改函数名称 OCIBindByPos2改为OCIBindByPos
2. 把bindColum.lengths 变量做指针转换 reinterpret_cast<ub2*>(bindColumn.lengths),

修改后编译后，在 D:\plugins\sqldrivers 目录下生成驱动

建立qt oracle oci库 这个库需要拷贝到工程目录下

#include <QCoreApplication>
#include <QSqlDatabase>
#include <QtGlobal>
#include <QtDebug>
#include <QSqlError>
#include <QSqlQuery>
#include <QSqlRecord>
#include <QSqlField>

int main()
{
    qDebug()<<"Available drivers:";


    QStringList drivers=QSqlDatabase::drivers();


    foreach(QString driver,drivers)


    qDebug()<<driver;

    QSqlDatabase db = QSqlDatabase::addDatabase("QOCI");

    qDebug() << "QT DB driver?" << db.isValid();

    bool    m_bIsConn;

    db.setHostName("10.2.3.102");
    db.setPort(1521);
    db.setDatabaseName("");
    db.setUserName("");
    db.setPassword("");
    if(db.open())
    {
         qDebug()<<QString("连接成功");
         m_bIsConn = true;
    }
    else
    {
         qDebug()<<"连接失败";
         m_bIsConn = false;
         qDebug()<<db.lastError();
    }


    QSqlQuery query("SELECT * FROM tables");
    while (query.next())
    {
        int iProNo = query.value(0).toInt();
        QString sProName = query.value(1).toString();
        qDebug()<< sProName;

    }



    if(m_bIsConn)
    {
        QSqlQuery query;
        bool bSuccess = query.exec("select * from DT_BASE_DTLS");
        if(bSuccess)
        {
            QSqlRecord rec = query.record();
          qDebug()<<("TableName的字段个数：")<<rec.count();
            QSqlField filed = rec.field(0);
          qDebug()<<("字段名称：")<<rec.field(0).name()<<("字段类型：")<<rec.field(0).type()<<("字段值：")<<rec.field(0).value();
          qDebug()<<("段名称：")<<rec.field(1).name()<<("字段类型：")<<rec.field(1).type()<<("字段值：")<<rec.field(1).value();
          qDebug()<<("字段名称：")<<rec.field(2).name()<<("字段类型：")<<rec.field(2).type()<<("字段值：")<<rec.field(2).value();
          qDebug()<<("字段名称：")<<rec.field(3).name()<<("字段类型：")<<rec.field(3).type()<<("字段值：")<<rec.field(3).value();
        }
        else
        {
          //qDebug()<<tr("error");
        }
    }



}