QSqlRelation is not working

QSqlRelation is not working

本文关键字：working not is QSqlRelation      更新时间：2023-10-16

下面是我的代码:

QSqlRelationalTableModel *model = new QSqlRelationalTableModel(this, db1);
model->setTable("syllabi");
model->select();
model->setRelation(0, QSqlRelation("teacher_id", "teachers", "teacher_name"));
ui->tableView->setModel(model);
qDebug() << model->lastError();

我试图用'teachers'表中的teacher_name替换teacher_id列，但它仍然显示了teacher_id列。调试显示如下:

QSqlError("， "， ")

列信息:https://i.stack.imgur.com/WP83F.png

try

model->setRelation(0, QSqlRelation("teachers", "teacher_id", "teacher_name"));
model->select();
select() after setRealation()

文档说明:

QSqlRelation::QSqlRelation(const QString &tableName, const QString &indexColumn, const QString &displayColumn)

构造一个QSqlRelation对象，其中tableName是外键引用的SQL表名，indexColumn是外键，displayColumn是应该呈现给用户的字段。

所以你似乎混淆了字符串参数的顺序，它应该是: 
model->setRelation(0, QSqlRelation("teachers", "teacher_id" "teacher_name"));
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