-(NSArray *)getAllStundets
{
//1创建临时集合 存储学生信息
NSMutableArray *arr = [NSMutableArray arrayWithCapacity:20];
//2打开数据库
sqlite3 *sql = [DBManager openDB];
//3执行命令语句
sqlite3_stmt *stmt;
//4预处理操作 查询表里的所有记录
if (sql!=nil) {
int num = sqlite3_prepare_v2(sql, "select * from student", -1, &stmt, nil);
//5是否可以操作表
if (num == SQLITE_OK) {
//6循环便利表中的记录 即检索每一行
while ( SQLITE_ROW == sqlite3_step(stmt)) {
//7根据指定索引找到指定行的信息
int stuid = sqlite3_column_int(stmt, 0);
NSString *stuname = [NSString stringWithFormat:@"%s",sqlite3_column_text(stmt, 1)];
NSString *stupwd = [NSString stringWithFormat:@"%s",sqlite3_column_text(stmt, 2)];
//8创建临时学生类型对象
Student *stu = [[Student alloc] init];
//9将数据表中的信息 存储到实体类的属性中
stu.stuid = stuid;
stu.stuname = stuname;
stu.stupwd = stupwd;
//将试题类型添加到数组中
[arr addObject:stu];
}
}
}
//10返回集合信息，即一组 学生类型的集合
return arr;
}
-(BOOL)addStudents:(Student *)stu
{
BOOL bol = NO;
sqlite3 *sql = [DBManager openDB];
sqlite3_stmt *stmt;
int num = sqlite3_prepare_v2(sql, "insert into student(stuname,stupwd) values(?,?)", -1, &stmt, nil);
sqlite3_bind_text(stmt, 1, [stu.stuname UTF8String], -1, nil);
sqlite3_bind_text(stmt, 2, [stu.stupwd UTF8String], -1, nil);
if (num == SQLITE_OK) {
if (SQLITE_DONE == sqlite3_step(stmt)) {
bol = YES;
}
}
return bol;
}
-(BOOL)updateStudents:(Student *)stu
{
BOOL bol = NO;
sqlite3 *sql = [DBManager openDB];
sqlite3_stmt *stmt;
int ret = sqlite3_prepare_v2(sql, "update student set stuname = ?, stupwd = ? where stuid = ? ", -1, &stmt, nil);
sqlite3_bind_text(stmt, 1, [stu.stuname UTF8String], -1, nil);
sqlite3_bind_text(stmt, 2, [stu.stupwd UTF8String], -1, nil);
sqlite3_bind_int(stmt, 3, stu.stuid);
if (ret == SQLITE_OK) {
if (SQLITE_DONE == sqlite3_step(stmt)) {
bol = YES;
}
}
return bol;
}
-(BOOL)removeStundets:(Student *)stu
{
BOOL bol = NO;
sqlite3 *sql = [DBManager openDB];
sqlite3_stmt *stmt;
int ret = sqlite3_prepare_v2(sql, "delete from student where stuname = ? or stupwd = ? or stuid = ?", -1, &stmt, nil);
sqlite3_bind_text(stmt, 1, [stu.stuname UTF8String], -1, nil);
sqlite3_bind_text(stmt, 2, [stu.stupwd UTF8String], -1, nil);
sqlite3_bind_int(stmt, 3, stu.stuid);
if (ret == SQLITE_OK) {
if (SQLITE_DONE == sqlite3_step(stmt)) {
bol = YES;
}
}
return bol;
}