param = cmd.Parameters.Add("@Fname",SqlDbType.VarChar,8);
param.Direction = ParameterDirection.Output;
param = cmd.Parameters.Add("@Fphone",SqlDbType.VarChar,8);
param.Direction = ParameterDirection.Output;
conn.Open();
cmd.ExecuteNonQuery();
string Fname = cmd.Parameters["@Fname"].Value.ToString();
string Fphone = cmd.Parameters["@Fphone"].Value.ToString();
Console.WriteLine(Fname + " " + Fphone);
conn.Close();
showSplit();
}
//**************************************
//*演示读取多个无关记录集
//**************************************
public void multiResult()
{
SqlCommand cmd;
cmd = conn.CreateCommand();
string sqla = "select Fname from friend";
string sqlb = "select Fphone from friend";
cmd.CommandText = sqla + ";" + sqlb;
conn.Open();
SqlDataReader reader= cmd.ExecuteReader();
int i = 1;
do
{
Console.WriteLine("第" + i.ToString() + "个记录集内容如下：\n");
while(reader.Read())
{
Console.WriteLine(reader[0].ToString() + "\t");
}
i++;
}while(reader.NextResult()); //NextResult()移动到下一个记录集
reader.Close();
conn.Close();
showSplit();
}
//**************************************
//*使用DataReader获得数据库模式信息
//**************************************
public void getSchema()
{
SqlCommand cmd;
cmd = conn.CreateCommand();
string sql = "select Fid,Fname,Fphone from friend";
cmd.CommandText = sql;
conn.Open();
SqlDataReader reader = cmd.ExecuteReader();
DataTable SchemaTable = reader.GetSchemaTable();
DataRowCollection SchemaColumns = SchemaTable.Rows;
DataColumnCollection SchemaProps = SchemaTable.Columns;
foreach(DataRow SchemaColumn in SchemaColumns)
{
foreach(DataColumn SchemaColumnProp in SchemaProps)
{
Console.WriteLine(SchemaColumnProp.ColumnName + "=" + SchemaColumn[SchemaColumnProp.ColumnName].ToString());
}
}
reader.Close();
conn.Close();
showSplit();
}
//**************************************
//*从数据库读取二进制数据的代码段
//*该代码段只是读取二进制的片断，不是
//*整个程序，所以不能执行，你可以把它
//*集成到你的WinForm项目里面。
//**************************************
public void getBinary()
{
/*
System.IO.MemoryStream stream = new System.IO.MemoryStream();
System.IO.BinaryWriter writer = new System.IO.BinaryWriter(stream);
int BufferSize = 1024;
byte[] Buffer = new Byte[BufferSize];
long Offset = 0;
long BytesRead = 0;
do
{
BytesRead = reader.GetBytes(2,Offset,Buffer,0,BufferSize);
writer.Writer(Buffer,0,(int)BytesRead);
writer.Flush();
Offset += BytesRead;
}
while(BytesRead == BufferSize);
*/
}
//添加输出分隔
private void showSplit() |
