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//DataReader的详细用法
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cmd.CommandText = "GetInfo";
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cmd.CommandType = CommandType.StoredProcedure;
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SqlParameter param = cmd.Parameters.Add("@Fid",16);
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param = cmd.Parameters.Add("@Fname",SqlDbType.VarChar,8);
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param.Direction = ParameterDirection.Output;
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param = cmd.Parameters.Add("@Fphone",SqlDbType.VarChar,8);
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param.Direction = ParameterDirection.Output;
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conn.Open();
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cmd.ExecuteNonQuery();
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string Fname = cmd.Parameters["@Fname"].Value.ToString();
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string Fphone = cmd.Parameters["@Fphone"].Value.ToString();
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Console.WriteLine(Fname + " " + Fphone);
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conn.Close();
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showSplit();
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}
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//**************************************
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//*演示读取多个无关记录集
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//**************************************
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public void multiResult()
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{
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SqlCommand cmd;
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cmd = conn.CreateCommand();
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string sqla = "select Fname from friend";
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string sqlb = "select Fphone from friend";
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cmd.CommandText = sqla + ";" + sqlb;
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conn.Open();
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SqlDataReader reader= cmd.ExecuteReader();
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int i = 1;
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do
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{
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Console.WriteLine("第" + i.ToString() + "个记录集内容如下:\n");
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while(reader.Read())
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{
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Console.WriteLine(reader[0].ToString() + "\t");
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}
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i++;
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}while(reader.NextResult()); //NextResult()移动到下一个记录集
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reader.Close();
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conn.Close();
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showSplit();
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}
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//**************************************
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//*使用DataReader获得数据库模式信息
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//**************************************
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public void getSchema()
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{
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SqlCommand cmd;
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cmd = conn.CreateCommand();
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string sql = "select Fid,Fname,Fphone from friend";
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cmd.CommandText = sql;
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conn.Open();
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SqlDataReader reader = cmd.ExecuteReader();
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DataTable SchemaTable = reader.GetSchemaTable();
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DataRowCollection SchemaColumns = SchemaTable.Rows;
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DataColumnCollection SchemaProps = SchemaTable.Columns;
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foreach(DataRow SchemaColumn in SchemaColumns)
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{
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foreach(DataColumn SchemaColumnProp in SchemaProps)
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{
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Console.WriteLine(SchemaColumnProp.ColumnName + "=" + SchemaColumn[SchemaColumnProp.ColumnName].ToString());
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}
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}
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reader.Close();
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conn.Close();
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showSplit();
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}
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//**************************************
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//*从数据库读取二进制数据的代码段
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//*该代码段只是读取二进制的片断,不是
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//*整个程序,所以不能执行,你可以把它
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//*集成到你的WinForm项目里面。
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//**************************************
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public void getBinary()
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{
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/*
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System.IO.MemoryStream stream = new System.IO.MemoryStream();
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System.IO.BinaryWriter writer = new System.IO.BinaryWriter(stream);
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int BufferSize = 1024;
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byte[] Buffer = new Byte[BufferSize];
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long Offset = 0;
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long BytesRead = 0;
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do
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{
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BytesRead = reader.GetBytes(2,Offset,Buffer,0,BufferSize);
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writer.Writer(Buffer,0,(int)BytesRead);
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writer.Flush();
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Offset += BytesRead;
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}
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while(BytesRead == BufferSize);
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*/
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}
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//添加输出分隔
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private void showSplit()
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{
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Console.WriteLine("\n********************************************************************\n");
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}
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public static void Main(string [] args)
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{
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SqlReader sqlreader = new SqlReader();
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sqlreader.basicReader();
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sqlreader.hasParamReader();
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sqlreader.hasOledbParamReader();
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sqlreader.outParamShow();
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sqlreader.multiResult();
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sqlreader.getSchema();
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}
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}
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