Qt入門篇(3):連結SQLITE資料庫

http://chenglearning.blogspot.tw/search/label/QTBasic

Author: YuTinCH

Qt Sqlite/Taiwan

@@ -0,0 +1,5 @@
+#include "DBConnection.h"
+
+DBConnection::DBConnection()
+{
+}

Qt Sqlite/firstqtproject/DBConnection.cpp

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+#-------------------------------------------------
+#
+# Project created by QtCreator 2013-11-03T22:12:55
+#
+#-------------------------------------------------
+
+QT       += core gui sql
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = firstqtproject
+TEMPLATE = app
+
+
+SOURCES += main.cpp\
+        mainwindow.cpp
+
+HEADERS  += mainwindow.h
+
+FORMS    += mainwindow.ui

Qt Sqlite/firstqtproject/Taiwan

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+#include "mainwindow.h"
+#include <QApplication>
+
+
+int main(int argc, char *argv[])
+{
+
+    QApplication a(argc, argv);
+    MainWindow w;
+    w.show();
+    
+    return a.exec();
+}

Qt Sqlite/firstqtproject/firstqtproject.pro

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+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+#include <QTextCodec>
+#include <QtSql/QtSql>
+
+MainWindow::MainWindow(QWidget *parent) :
+    QMainWindow(parent),
+    ui(new Ui::MainWindow)
+{
+    ui->setupUi(this);
+    ui->comboBox->setEnabled(false);
+    QStringList cityname;
+    if(DBConnection(cityname))
+        ui->comboBox->addItems(cityname);
+
+}
+MainWindow::~MainWindow()
+{
+    delete ui;
+}
+void MainWindow::on_checkBox_clicked(bool checked)
+{
+    if(checked)  ui->comboBox->setEnabled(true);
+    else ui->comboBox->setEnabled(false);
+}
+bool MainWindow::DBConnection(QStringList &citylist)
+{
+    QSqlDatabase db;
+    db=QSqlDatabase::addDatabase("QSQLITE");
+    db.setDatabaseName("Taiwan");
+    if(db.open())
+    {
+        QSqlQuery query("Select City_cname from Taiwan_City");
+        while(query.next())
+        {
+            citylist.append(query.value(0).toString().trimmed());
+        }
+        qDebug()<<"Success";
+         return true;
+    }
+    else return false;
+}

Qt Sqlite/firstqtproject/firstqtproject.pro.user

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+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QStringList>
+
+namespace Ui {
+class MainWindow;
+}
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+    
+public:
+    explicit MainWindow(QWidget *parent = 0);
+    ~MainWindow();
+    
+private slots:
+    void on_checkBox_clicked(bool checked);
+
+private:
+    Ui::MainWindow *ui;
+    bool DBConnection(QStringList &citylist);
+};
+
+#endif // MAINWINDOW_H

Qt Sqlite/firstqtproject/main.cpp

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+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>368</width>
+    <height>91</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralWidget">
+   <layout class="QGridLayout" name="gridLayout">
+    <item row="0" column="0">
+     <widget class="QCheckBox" name="checkBox">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+      <property name="minimumSize">
+       <size>
+        <width>120</width>
+        <height>0</height>
+       </size>
+      </property>
+      <property name="maximumSize">
+       <size>
+        <width>120</width>
+        <height>16777215</height>
+       </size>
+      </property>
+      <property name="text">
+       <string>選擇台灣城市</string>
+      </property>
+     </widget>
+    </item>
+    <item row="0" column="1">
+     <widget class="QComboBox" name="comboBox">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QMenuBar" name="menuBar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>368</width>
+     <height>21</height>
+    </rect>
+   </property>
+  </widget>
+  <widget class="QToolBar" name="mainToolBar">
+   <attribute name="toolBarArea">
+    <enum>TopToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+  </widget>
+  <widget class="QStatusBar" name="statusBar"/>
+ </widget>
+ <layoutdefault spacing="6" margin="11"/>
+ <resources/>
+ <connections/>
+</ui>