Qt QSqlTableModel 使用心得
连接数据库
执行sql查询,条件显示,排序
获取记录数,列数以及记录内容,字段内容
新增,修改,删除,恢复
其它
1---------------连接数据库(我用的access2003做实验)
在.pro文件添加
QT +=SQL
win32:CONFIG+=console
---------------------------------------
#include <QtGui/QApplication>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QDebug>
#include <QVariant>
#include <QString>
#include <QSqlTableModel>
#include <QTableView>
#include ""
int main(intargc, char *argv[])
{
QApplication a(argc, argv);
// MainWindow w;
//();
QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
("DRIVER={Microsoft AccessDriver (*.mdb)};FIL={MS Access};DBQ=;UID='';PWD=''");
bool ok = ();
if(ok)
{
qDebug()<<"connect ok!";
}
else
{
qDebug()<<"connect error!";
return false;
}
return ();
}
2-----执行sql查询,条件显示,排序
查询:
model = newQSqlTableModel(this);
model->setTable(“student”);
model->setEditStrategy(QSqlTableModel::OnManualSubmit);
model->select(); //选取整个表的所有行
// model->removeColumn(1); //不显示第二列,如果这时添加记录,则该属性的值添加不上
QTableView *view= new QTableView;
view->setModel(model);
view->show();
//View->setEditTriggers(QAbstractItemView::NoEditTriggers); 使其不可编辑
条件:(等价于SQL语句的where)
model->setFilter(QObject::tr(“name= ‘admin’”).arg(name)); //根据姓名进行筛选
model->select(); //显示结果
排序:(等价于ORDERBY)
model->setSort(0,Qt::AscendingOrder); //id属性,即第0列,升序排列
model->select();
model->setSort(0,Qt::DescendingOrder); //id属性,即第0列,降序排
model->select();
3------获取记录数,列数以及记录内容,字段内容
记录数: Model->rowcount
记录值:
值=(num).value(1).toString();
Qrecord record= QSqlRecord record = (记录行数);
值=(“字段名或索引”)
字段数:
字段值:
4------新增,修改,删除,提交,撤销
新增:
int rowNum = model->rowCount();//获得表的行数
int id = 10;
model->insertRow(rowNum); //添加一行
model->setData(model->index(rowNum,0),id);
//model->submitAll(); //可以直接提交
或者用record添加
QSqlRecord record = ();
("nam","new");
(1,record);
修改:
首先用条件找到某一条记录
QSqlRecord record = (num);
("name",("name").toString()+"2");
(num,record);
if(())
"成功!"
else
"失败!"
或者用下面方法用setData()来修改,代码如下:
((1,1),"new");
if(())
"成功!"
else
"失败!"
删除:
int curRow = ui->tableView->currentIndex().row();
//获取选中的行
model->removeRow(curRow);
//删除该行
int ok = QMessageBox::warning(this,tr(“删除当前行!”),tr(“你确定”
“删除当前行吗?”),
QMessageBox::Yes,QMessageBox::No);
if(ok == QMessageBox::No)
{
model->revertAll();//如果不删除,则撤销
}
else model->submitAll(); //否则提交,在数据库中删除该行
如果没有table
(起始行, 要删除的总行数);
();
提交
model->database().transaction();//开始事务操作
if (model->submitAll()) {
model->database().commit();//提交
} else {
model->database().rollback();//回滚
QMessageBox::warning(this,tr(“tableModel”),
tr(“数据库错误: %1″)
.arg(model->lastError().text()));
}
撤销
model->revertAll();
5------其它
he QSqlTableModel class provides an editable data model for a single database table. More...
#include <QSqlTableModel>
Inherits: QSqlQueryModel.
Inherited by: QSqlRelationalTableModel.
- List of all members, including inherited members
Public Types
enum | EditStrategy { OnFieldChange, OnRowChange, OnManualSubmit } |
Public Functions
QSqlTableModel ( QObject * parent = 0, QSqlDatabase db = QSqlDatabase() ) | |
virtual | ~QSqlTableModel () |
QSqlDatabase | database () const |
EditStrategy | editStrategy () const |
int | fieldIndex ( const QString & fieldName ) const |
QString | filter () const |
bool | insertRecord ( int row, const QSqlRecord & record ) |
bool | isDirty ( const QModelIndex & index ) const |
QSqlIndex | primaryKey () const |
virtual void | revertRow ( int row ) |
virtual bool | select () |
virtual void | setEditStrategy ( EditStrategy strategy ) |
virtual void | setFilter ( const QString & filter ) |
bool | setRecord ( int row, const QSqlRecord & record ) |
virtual void | setSort ( int column, Qt::SortOrder order ) |
virtual void | setTable ( const QString & tableName ) |
QString | tableName () const |
Reimplemented Public Functions
virtual void | clear () |
virtual QVariant | data ( const QModelIndex & index, int role = Qt::DisplayRole ) const |
virtual Qt::ItemFlags | flags ( const QModelIndex & index ) const |
virtual QVariant | headerData ( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const |
virtual bool | insertRows ( int row, int count, const QModelIndex & parent = QModelIndex() ) |
virtual bool | removeColumns ( int column, int count, const QModelIndex & parent = QModelIndex() ) |
virtual bool | removeRows ( int row, int count, const QModelIndex & parent = QModelIndex() ) |
virtual int | rowCount ( const QModelIndex & parent = QModelIndex() ) const |
virtual bool | setData ( const QModelIndex & index, const QVariant & value, int role = Qt::EditRole ) |
virtual void | sort ( int column, Qt::SortOrder order ) |
- 16 public functions inherited from QSqlQueryModel
- 2 public functions inherited from QAbstractTableModel
- 35 public functions inherited from QAbstractItemModel
- 29 public functions inherited from QObject
Public Slots
virtual void | revert () |
void | revertAll () |
virtual bool | submit () |
bool | submitAll () |
- 2 public slots inherited from QAbstractItemModel
- 1 public slot inherited from QObject
Signals
void | beforeDelete ( int row ) |
void | beforeInsert ( QSqlRecord & record ) |
void | beforeUpdate ( int row, QSqlRecord & record ) |
void | primeInsert ( int row, QSqlRecord & record ) |
- 18 signals inherited from QAbstractItemModel
- 1 signal inherited from QObject
Protected Functions
virtual bool | deleteRowFromTable ( int row ) |
QModelIndex | indexInQuery ( const QModelIndex & item ) const |
virtual bool | insertRowIntoTable ( const QSqlRecord & values ) |
virtual QString | orderByClause () const |
virtual QString | selectStatement () const |
void | setPrimaryKey ( const QSqlIndex & key ) |
void | setQuery ( const QSqlQuery & query ) |
virtual bool | updateRowInTable ( int row, const QSqlRecord & values ) |