iOS开发之数据库：增删改查之改删

Posted 2020-06-18

//修改学生数据
    func updateStudents(){
        //准备sql语句
        let string:NSString = "update Student set score = 100 where name like ‘a%‘"
        let sql = string.UTF8String
        //执行sql语句
        if sqlite3_exec(db, sql, nil, nil, nil) != SQLITE_OK {
            sqlite3_close(db)
            print("update failed")
        }
    }

 

//删除学生数据
    func deleteStudents(){
        //准备sql语句
        let string:NSString = "delete from Student where score < 60"
        let sql = string.UTF8String
        //执行sql语句
        if sqlite3_exec(db, sql, nil, nil, nil) != SQLITE_OK {
            sqlite3_close(db)
            print("delete failed")
        }
    }