[代码] mydata.h
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#ifndef MYDATA_H |
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#define MYDATA_H |
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#include <QObject> |
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#include <QString> |
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#include <QtSql/QSqlTableModel> |
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#include <QtSql/QSqlQuery> |
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#include <QStringList> |
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#include <QtSql/QSqlDatabase> |
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class mydata : public QObject |
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{ |
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Q_OBJECT |
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public: |
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explicit mydata(QObject *parent = 0); |
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~mydata(); |
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void SetTableName(QString table); |
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bool opendatabase(); |
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bool insert(QString &table, QStringList &names,QStringList &values); |
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bool Updata(QString &table, QStringList &names,QStringList &values, QString &expression); |
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bool del(QString &table, QString &expression); |
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void GetValues(QString &table, QStringList &values); |
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private: |
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QSqlTableModel *model; |
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QSqlDatabase _db; |
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QString _tableName; |
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}; |
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#endif // MYDATA_H |
mydata.cpp
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/**************************************************************************** |
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** |
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** Copyright (C) 2013 C,g |
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** All rights reserved. |
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** Contact: 1213125967@qq.com |
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** Please keep the author contact information. |
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** 2013-10-31 |
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** |
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****************************************************************************/ |
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#include <QtSql/QSqlQuery> |
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#include <QObject> |
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#include "mydata.h" |
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mydata::mydata(QObject *parent) : |
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QObject(parent) |
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{ |
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} |
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mydata::~mydata() |
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{ |
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_db.close(); |
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} |
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void mydata::SetTableName(QString table) |
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{ |
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_tableName = table + ".db"; |
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} |
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/* |
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打开数据库. |
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*/ |
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bool mydata::opendatabase() |
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{ |
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_db = QSqlDatabase::addDatabase("QSQLITE"); |
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_db.setDatabaseName(_tableName); |
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return _db.open(); |
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} |
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/* |
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插入函数. |
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构造SQL插入语句. |
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*/ |
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bool mydata::insert(QString &table, QStringList &names, QStringList &values) |
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{ |
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if (names.size() != values.size()) |
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{ |
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return false; |
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} |
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QSqlQuery query(QSqlDatabase::database()); |
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QString sql = QString("insert into ") + table + QString("("); |
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int i; |
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for (i=0; i < names.size(); i++) |
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{ |
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sql = sql + names.value(i); |
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if (i != names.size() - 1) |
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{ |
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sql+=QString(","); |
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} |
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else |
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{ |
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sql = sql + QString(")"); |
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} |
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} |
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sql = sql + QString("values ("); |
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for (i = 0; i < values.size(); i++) |
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{ |
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sql = sql + QString("'") + values.value(i) + QString("'"); |
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if (i != values.size()-1) |
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{ |
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sql = sql + QString(","); |
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} |
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} |
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sql = sql + QString(")"); |
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if (query.exec(sql)) |
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{ |
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return true; |
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} |
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else |
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{ |
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return false; |
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} |
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} |
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/* |
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修改函数. |
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构造SQL修改语句. |
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*/ |
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bool mydata::Updata(QString &table, QStringList &names, QStringList &values, QString &expression) |
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{ |
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if (names.size() != values.size()) |
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{ |
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return false; |
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} |
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//UPDATE 表名称 SET 列名称 = 新值 WHERE 列名称 = 某值 |
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QSqlQuery query(QSqlDatabase::database()); |
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QString sql = QString("update ")+table+QString(" set "); |
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for (int i = 0; i < names.size(); i++) |
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{ |
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sql = sql + names.value(i); |
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sql = sql + QString(" = '"); |
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sql = sql + values.value(i); |
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sql = sql + QString("'"); |
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if (i != names.size()-1) |
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{ |
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sql = sql + QString(" ,"); |
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} |
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} |
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sql = sql + QString(" where ") + expression; |
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if (query.exec(sql)) |
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{ |
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return true; |
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} |
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else |
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{ |
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return false; |
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} |
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} |
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/* |
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删除函数. |
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构造SQL删除语句. |
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*/ |
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bool mydata::del(QString &table, QString &expression) |
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{ |
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//DELETE FROM 表名称 WHERE 列名称 = 值 |
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QSqlQuery query(QSqlDatabase::database()); |
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QString sql = QString("delete from ") + table + QString(" where ") + expression; |
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if (query.exec(sql)) |
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{ |
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return true; |
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} |
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else |
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{ |
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return false; |
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} |
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} |
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void mydata::GetValues(QString &table, QStringList &values) |
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{ |
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QSqlQuery query(QSqlDatabase::database()); |
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QString sql = QString("select * from ") + table; |
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query.exec(sql); |
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while (query.next()) |
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{ |
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values << query.value(0).toString(); |
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} |
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} |