十一、Qt数据库操作.zip_QTcsv资源-CSDN文库

共134个文件

png：36个

o：19个

cpp：19个

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在IT领域，尤其是在软件开发中，Qt是一个非常流行的开源跨平台应用程序开发框架，它由Qt Company维护，并且广泛用于创建GUI（图形用户界面）应用程序。本篇将详细讲解如何在Qt环境中进行数据库操作，主要围绕着标题“十一、Qt数据库操作.zip”中的核心内容展开。 1. **Qt与数据库连接**：在Qt中，我们通常使用QSqlDatabase模块来与各种类型的数据库进行交互。我们需要引入必要的库，并通过QSqlDatabase类的`addDatabase()`方法来创建一个数据库连接。例如，如果我们要连接到SQLite数据库，代码可能如下： ```cpp QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE"); db.setHostName("localhost"); // 对于本地数据库，可以为空 db.setDatabaseName("/path/to/your/database.db"); if (!db.open()) { qDebug() << "无法打开数据库：" << db.lastError().text(); return false; } ``` 这段代码会创建一个SQLite数据库连接，如果连接失败，还会打印出错误信息。 2. **执行SQL语句**：一旦建立了数据库连接，我们就可以通过QSqlQuery或QSqlTableModel来执行SQL查询。QSqlQuery用于执行单个SQL命令，而QSqlTableModel则适用于数据模型，便于在界面上显示数据。例如，以下代码将执行一个简单的SELECT查询： ```cpp QSqlQuery query; query.prepare("SELECT * FROM MyTable"); if (query.exec()) { while (query.next()) { QString name = query.value(0).toString(); int age = query.value(1).toInt(); // 处理结果 } } else { qDebug() << "查询失败：" << query.lastError().text(); } ``` 3. **插入、更新和删除数据**：同样，我们可以通过预处理的SQL语句来插入、更新和删除数据。例如，插入一条记录： ```cpp query.prepare("INSERT INTO MyTable VALUES (?, ?)"); query.addBindValue("John Doe"); query.addBindValue(30); if (!query.exec()) { qDebug() << "插入失败：" << query.lastError().text(); } ``` 4. **事务处理**： Qt支持SQL事务，这对于确保数据的一致性和完整性至关重要。在一系列数据库操作中，可以使用begin(), commit()和rollback()方法来包裹这些操作。如果所有操作都成功，提交事务；如果出现错误，回滚事务以保持数据库的完整状态。 5. **使用QSqlTableModel**：如果你希望在界面上显示和编辑数据库数据，QSqlTableModel是理想的选择。它可以绑定到QTableView等视图组件，自动处理数据的加载、编辑和保存。创建一个QSqlTableModel，设置其数据库和表名，然后将其设置为视图的模型： ```cpp QSqlTableModel* model = new QSqlTableModel(this, db); model->setTable("MyTable"); ui->tableView->setModel(model); ``` 6. **文件名称列表（test41、test43、test42、test44）**：在实际项目中，这些可能是示例代码、数据库文件或资源文件的名称。例如，test41和test43可能代表两个不同的数据库操作示例，test42可能是数据库连接配置文件，而test44可能是包含数据的CSV文件，用于测试数据库导入功能。 7. **错误处理**：在进行任何数据库操作时，错误处理都是至关重要的。Qt提供了QSqlError类，可以获取并打印出详细的错误信息，帮助开发者诊断问题。总结起来，Qt数据库操作涵盖了连接、查询、数据修改、事务处理和UI集成等多个方面，提供了丰富的API来简化数据库编程。结合提供的文件名称，我们可以进一步学习和实践这些概念，构建完整的数据库应用。

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十一、Qt数据库操作.zip （134个子文件）

qrc_res.cpp 21KB

mainwindow.cpp 10KB

mainwindow.cpp 9KB

moc_mainwindow.cpp 7KB

mainwindow.cpp 5KB

moc_mainwindow.cpp 5KB

mainwindow.cpp 4KB

moc_dialogdata.cpp 4KB

dialogdata.cpp 3KB

qwcomboboxdelegate.cpp 1KB

main.cpp 183B

data.db 16KB

test.db 12KB

Makefile.Debug 112KB

Makefile.Debug 84KB

Makefile.Debug 74KB

test_43.exe 3.34MB

test_41.exe 2.63MB

test_42.exe 2.09MB

test_44.exe 2.04MB

ui_mainwindow.h 21KB

ui_mainwindow.h 20KB

moc_predefs.h 14KB

ui_dialogdata.h 13KB

ui_mainwindow.h 7KB

ui_mainwindow.h 5KB

mainwindow.h 1KB

qwcomboboxdelegate.h 975B

mainwindow.h 840B

mainwindow.h 748B

mainwindow.h 744B

dialogdata.h 602B

Makefile 31KB

mainwindow.o 904KB

mainwindow.o 877KB

mainwindow.o 823KB

mainwindow.o 816KB

dialogdata.o 809KB

moc_mainwindow.o 732KB

moc_mainwindow.o 729KB

moc_dialogdata.o 688KB

main.o 667KB

qwcomboboxdelegate.o 616KB

qrc_res.o 9KB

paste.png 459B

open.png 454B

copy.png 446B

cut.png 419B

new.png 391B

bold.png 310B

italic.png 256B

underline.png 229B

共 134 条

/**************************************************************************** ** Resource object code ** ** Created by: The Resource Compiler for Qt version 5.13.0 ** ** WARNING! 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0x51,0x83,0x80,0x10,0xb0,0xc6,0xd1,0x95,0x72,0xdd,0x20,0x79,0x7,0xf5,0x60,0xd, 0x0,0xab,0x35,0xbe,0x6e,0xec,0x54,0xbd,0x86,0x7f,0x21,0x17,0x33,0x9e,0xad,0x15, 0x40,0xad,0x29,0x39,0xf,0x96,0xf1,0xc5,0x8,0x0,0x69,0x74,0xc7,0x94,0xaa,0x3c, 0x26,0xe2,0xe4,0x37,0x29,0xce,0xd4,0x1f,0x7f,0xad,0x7f,0x85,0xf8,0x0,0xc9,0x10, 0x8f,0x97,0xe6,0x50,0xfe,0x7b,0x0,0x0,0x0,0x0,0x49,0x45,0x4e,0x44,0xae,0x42, 0x60,0x82, // E:/Qt/test41/test_41/images/copy.png 0x0,0x0,0x1,0xbe, 0x89, 0x50,0x4e,0x47,0xd,0xa,0x1a,0xa,0x0,0x0,0x0,0xd,0x49,0x48,0x44,0x52,0x0, 0x0,0x0,0x19,0x0,0x0,0x0,0x17,0x8,0x2,0x0,0x0,0x0,0x71,0x81,0x73,0x44, 0x0,0x0,0x0,0x9,0x70,0x48,0x59,0x73,0x0,0x0,0xe,0xc4,0x0,0x0,0xe,0xc4, 0x1,0x95,0x2b,0xe,0x1b,0x0,0x0,0x1,0x70,0x49,0x44,0x41,0x54,0x38,0x8d,0xe5, 0x54,0x2b,0x50,0xc3,0x40,0x10,0x7d,0x65,0x2a,0xf6,0xdc,0xc5

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