C# ADO.net连接数据库 进行增删改查操作
ADO.NET数据库操作图
数据库连接语句
static string sqlCon = @"server =.;database=strike;Integrated Security=True"; ///
/// 连接测试
///
private static void TestConnection()
{
//string conStr = @"server=.;database=strike;Integrated Security=True;";
SqlConnection conn = new SqlConnection(sqlCon);
conn.Open();
conn.Close();
Console.WriteLine("连接对象新建成功。");
Console.ReadKey();
}1增删改
增删改都是类似的操作，使用SqlCommand进行，
都是执行非查询语句ExecuteNonQuery()进行数据库操作，只是sql语句有点不同。
新增记录
///
/// 新增记录
///
public static void AddRecord()
{
int res = -1;
//string sqlCon = "server =.;database=strike;Integrated Security=True";
SqlConnection conn = new SqlConnection();
conn.ConnectionString = sqlCon;
string b_title = "标";
string b_content = "容";
string b_author = "作";
string addtime = "2011-11-11";
int b_cid = 102;
string sqlStr2 = string.Format("insert book(b_cid,b_title,b_content,b_author,b_isdel,b_addtile,b_money) values({0},'{1}','{2}','{3}',0,'{4}',10)", b_cid, b_title, b_content, b_author, addtime);
string sqlStr = "insert book(b_cid,b_title,b_content,b_author,b_isdel,b_addtile,b_money) values(103,'dsf','dfdf','dfd',0,'2011-11-11',10)";
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = sqlStr2;
conn.Open();
res = cmd.ExecuteNonQuery();
conn.Close();
if (res > 0)
{
Console.WriteLine("受影响" + res);
}
} ///
/// 删除数据
///
public static void DelRecord()
{
int res = -1;
//string sqlCon = "server =.;database=strike;Integrated Security=True";
SqlConnection conn = new SqlConnection();
conn.ConnectionString = sqlCon;
string sqlStr = "delete book where b_id=18";
SqlCommand cmd = new SqlCommand(sqlStr, conn);
conn.Open();
res = cmd.ExecuteNonQuery();
conn.Close();
if (res > 0)
{
Console.WriteLine(res + "行受影响");
}
} ///
/// 软删除
///
public static void SoftDelRecord()
{
int res = -1;
// string sqlCon = @"server =.;database=strike;Integrated Security=True";
SqlConnection conn = new SqlConnection();
conn.ConnectionString = sqlCon;
string sqlStr = "update book set b_isdel=1 where b_cid=103";
SqlCommand cmd = new SqlCommand(sqlStr, conn);
conn.Open();
res = cmd.ExecuteNonQuery();
conn.Close();
if (res > 0)
{
Console.WriteLine(res + "行受影响");
}
}2查询操作
1）SqlCommand查询单个值
用ExecuteScalar（）方法 ，返回单个值(Object)（查询结果第一行第一列的值）
public static void QuerySingle()
{
SqlConnection conn = new SqlConnection(sqlCon);
string sqlStr = "select * from book";
SqlCommand cmd = new SqlCommand(sqlStr, conn);
conn.Open();
//返回的是查询结果集第一单元格的值，返回的是object类型
object obj = cmd.ExecuteScalar();
conn.Close();
Console.WriteLine(obj.ToString());
}2）SqlCommand查询多行
用ExecuteReader()方法
///
/// 查询多行数据---DataReader逐行读取,每次读一行
///
public static void QueryList()
{
SqlConnection con = new SqlConnection(sqlCon);
string sqlStr = "select * from book";
SqlCommand cmd = new SqlCommand(sqlStr, con);
con.Open();
SqlDataReader dr = cmd.ExecuteReader();
if (dr.HasRows)
{
while (dr.Read())//dr每read（）一次就读取一行
{
//read()后，dr就是一行数据
object o = dr["b_title"];
for (int i = 0; i < dr.FieldCount; i++)
{
Console.Write(dr[i].ToString() + "\t");
int a = dr.GetInt32(0);
}
Console.Write("\n");
}
// Console.WriteLine("有数据");
}
else
{
Console.WriteLine("无数据");
}
}3）使用适配器读取数据
public static void QueryListByAdapter()
{
SqlConnection conn = new SqlConnection(sqlCon);
string sqlStr = "select * from book";
//创建适配器对象，高数它要做些什么事情，走哪条路去
SqlDataAdapter da = new SqlDataAdapter(sqlStr, conn);
// SqlDataAdapter da = new SqlDataAdapter();
//创建数据集对象（程序的临时数据库）
DataSet ds = new DataSet();
DataTable dt1 = new DataTable();
//调用fill方法，填充数据集。
da.Fill(dt1);
da.Fill(ds);
//获得数据集的第一张表
DataTable dt = ds.Tables[0];
//循环数据表的每一行
for (int i = 0; i < dt.Rows.Count; i++)
{
DataRow dr = dt.Rows[i];//每一行付给dr
Console.WriteLine(dr[0].ToString() + "___" + dr["b_title"].ToString());
}
} public static void QueryListByProc2()
{
string sqlCon = "server=.;database=strike;Integrated Security=True;";
SqlConnection conn = new SqlConnection(sqlCon);
SqlCommand cmd = new SqlCommand("uspo_GetPageBooks", conn);
cmd.CommandType = CommandType.StoredProcedure;
SqlParameter[] paras ={
new SqlParameter("@pageIndex",SqlDbType.Int,4),
new SqlParameter("@pageSize",SqlDbType.Int,4)
};
paras[0].Value = 1;
paras[1].Value = 3;
cmd.Parameters.AddRange(paras);
//有适配器读取数据
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
Console.WriteLine(dr[0].ToString() + "__" + dr[1].ToString() + "__" + dr[2].ToString());
}AOD.net的基本操作就这些，要掌握好以后还要多写多练，问google大神。