Question

Possible Duplicate:
How to implement Primary Key and Foreign Key Table Data in Class Structure in Iphone Application

How to Select Foreign Key and Primary Key table data for display all data into detailviewcontroller Of rootTableView using this query

select 
    TaskId, TaskName, Category, StartDate, DueDate, Status 
from 
    ToDo, Category 
Where 
    ToDo.TaskId = Category.TaskId.

Thanks in advance….

Answer 1

if (sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK) {

    //const char *sql = "select TaskId,TaskName,StartDate,DueDate,Status,CategoryId from ToDo";

    const char *sql = "SELECT TaskId,TaskName,StartDate,DueDate,Status,ToDo.CategoryId,CategoryName FROM ToDo LEFT OUTER JOIN Category ON ToDo.CategoryId=Category.CategoryId";

    sqlite3_stmt *selectstmt;
    if(sqlite3_prepare_v2(database, sql, -1, &selectstmt, NULL) == SQLITE_OK) {

        while(sqlite3_step(selectstmt) == SQLITE_ROW) {

            NSInteger primaryKey = sqlite3_column_int(selectstmt, 0);
            ToDo *toDoObj = [[ToDo alloc] initWithPrimaryKey:primaryKey];
            toDoObj.taskName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 1)];
            toDoObj.startDate = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 2)];
            toDoObj.dueDate = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 3)];
            toDoObj.status  = sqlite3_column_int(selectstmt, 4);
            toDoObj.categoryId = sqlite3_column_int(selectstmt, 5);
            toDoObj.category = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 6)];
            toDoObj.isDirty = NO;

            [appDelegate.todoArray addObject:toDoObj];
            [toDoObj release];
        }
    }

}
else
    sqlite3_close(database);