--建库建表
create database student;
use student;
create table student(
    sname varchar(10) not null,
    sno int not null,
    sage int not null,
    ssex varchar(2) not null
);
alter table student
    add constraint PK_sno primary key (sno),
        constraint CK_ssex check(ssex = ‘男‘ or ssex = ‘女‘),
        constraint CK_sage check(sage > 8 and sage < 40)

insert into student values(‘张三‘, 103, 23, ‘男‘);
insert into student values(‘李四‘, 104, 24, ‘男‘);
insert into student values(‘王五‘, 105, 25, ‘男‘);
insert into student values(‘赵六‘, 106, 26, ‘男‘);
insert into student values(‘朱七‘, 107, 27, ‘男‘);
select * from student;
delete student;

public static void AdapterAndSqlCommand()
        {
            //第一步：获取数据库配置信息
            String connStr = ConfigurationManager.ConnectionStrings["connStr"].ToString();
            //第二步：构建SqlCommand查询语句
            SqlCommand command = new SqlCommand("select * from student;");
            command.Connection = new SqlConnection(connStr);
            //第三步：创建SqlDataAdapter
            SqlDataAdapter adapter = new SqlDataAdapter(command);
            //第四步：创建DataSet和DataTable
            DataSet dataSet = new DataSet();
            DataTable dataTable = new DataTable();
            //第五步：填充数据
            adapter.Fill(dataTable);
            dataSet.Tables.Add(dataTable);
            //修改第一行数据中的姓名为小红，并将其性别改为女
            dataTable.Rows[0]["sname"] = "小红";
            dataTable.Rows[0]["ssex"] = "女";
            //删除第二行数据
            dataTable.Rows[1].Delete();
            //构建一个新的行，并添加到表中去
            dataTable.Rows.Add(new object[] {"小明", 108, 18, "男" });
            //创建SqlCommandBuilder对象，并绑定一个SqlDataAdapter对象
            SqlCommandBuilder scb = new SqlCommandBuilder(adapter);
            //打印输出SqlCommandBuilder对象的增删改sql命令语句
            Console.WriteLine("SqlCommandBuilder实例的Insert命令： " + scb.GetInsertCommand().CommandText);
            Console.WriteLine("SqlCommandBuilder实例的Delete命令： " + scb.GetDeleteCommand().CommandText);
            Console.WriteLine("SqlCommandBuilder实例的Update命令： " + scb.GetUpdateCommand().CommandText);
            //将有变动的行同步到数据库中
            adapter.Update(dataTable.GetChanges());
            //保存修改
            dataTable.AcceptChanges();
            //下面是一个遍历输出datatable中的数据
            foreach (DataTable table in dataSet.Tables)
            {
                foreach(DataRow row in table.Rows)
                {
                    Console.WriteLine(row[0] + ", " + row[1] + ", " + row[2] + ", " + row[3]);
                }
            }
        }