create database

src/database.cpp

@@ -0,0 +1,94 @@
+#include <QSqlDatabase>
+#include <QSqlError>
+#include <QSqlQuery>
+QSqlDatabase database;
+if (QSqlDatabase::contains("qt_sql_default_connection"))
+{
+    database = QSqlDatabase::database("qt_sql_default_connection");
+}
+else
+{
+    database = QSqlDatabase::addDatabase("QSQLITE");
+    database.setDatabaseName("MyDataBase.db");
+}
+if (!database.open())
+{
+    qDebug() << "Error: Failed to connect database." << database.lastError();
+}
+else
+{
+    // do something
+}
+
+QSqlQuery sql_query;
+
+QString create_sql = "create table Pets (id int primary key, type varchar(10), name varchar(30),knowledge varchar(200), link varchar(50))";
+sql_query.prepare(create_sql);
+if(!sql_query.exec())
+{
+    qDebug() << "Error: Fail to create table." << sql_query.lastError();
+}
+else
+{
+    qDebug() << "Table created!";
+}
+QString create_sql = "create table Feedingnowledge (id int primary key, type varchar(10), knowledge varchar(200), link varchar(50))";
+sql_query.prepare(create_sql);
+if(!sql_query.exec())
+{
+    qDebug() << "Error: Fail to create table." << sql_query.lastError();
+}
+else
+{
+    qDebug() << "Table created!";
+}
+QString create_sql = "create table PetRecord (id int primary key, date varchar(20), time varchar(20), type varchar(20), details varchar(100))";
+sql_query.prepare(create_sql);
+if(!sql_query.exec())
+{
+    qDebug() << "Error: Fail to create table." << sql_query.lastError();
+}
+else
+{
+    qDebug() << "Table created!";
+}
+QString create_sql = "create table Favorites (id int primary key, for_id int, link varchar(50))";
+sql_query.prepare(create_sql);
+if(!sql_query.exec())
+{
+    qDebug() << "Error: Fail to create table." << sql_query.lastError();
+}
+else
+{
+    qDebug() << "Table created!";
+}
+
+
+QString insert_sql = "insert into student values (?, ?, ?)";
+sql_query.prepare(insert_sql);
+sql_query.addBindValue(max_id+1);
+sql_query.addBindValue("Wang");
+sql_query.addBindValue(25);
+if(!sql_query.exec())
+{
+    qDebug() << sql_query.lastError();
+}
+else
+{
+    qDebug() << "inserted Wang!";
+}
+if(!sql_query.exec("INSERT INTO student VALUES(3, \"Li\", 23)"))
+{
+    qDebug() << sql_query.lastError();
+}
+else
+{
+    qDebug() << "inserted Li!";
+}
+// 
+
+
+
+*/
+
+database.close();