в 15:31, 26 мая 2010

2010-05-26T15:31:19Z

Admin: 1 версия

2010-05-26T11:42:26Z

1 версия

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==Get result data from SqlDataReader by type: decimal, string, int and boolean==

<source lang="csharp">
using System;
using System.Data;
using System.Data.SqlClient;
class TypedMethods
{
static void Main(string[] args)
{
string connString = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
string sql = @"select * from employee";
SqlConnection conn = new SqlConnection(connString);
try {
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn);
SqlDataReader reader = cmd.ExecuteReader();
while(reader.Read()) {
Console.WriteLine( "{0}\t {1}\t\t {2}\t {3}",
// nvarchar
reader.GetString(0).PadRight(30),
// money
reader.GetDecimal(1),
// smallint
reader.GetInt16(2),
// bit
reader.GetBoolean(3));
}
reader.Close();
} catch(Exception e) {
Console.WriteLine("Error Occurred: " + e);
} finally {
conn.Close();
}
}
}

</source>

==Result set info: column Name, column Type, type name==

<source lang="csharp">
using System;
using System.Data;
using System.Data.SqlClient;
class ResultSetInfo{
static void Main(string[] args) {
string connString = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
string sql = @"select FirstName, LastName from Employee";
SqlConnection conn = new SqlConnection(connString);
try {
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn);
SqlDataReader reader = cmd.ExecuteReader();
Console.WriteLine("Column Name:\t{0} {1}", reader.GetName(0).PadRight(25),reader.GetName(1));
Console.WriteLine("Data Type:\t{0} {1}", reader.GetDataTypeName(0).PadRight(25), reader.GetDataTypeName(1));
while(reader.Read()) {
Console.WriteLine("\t\t{0} {1}",
reader.GetString(0).ToString().PadRight(25),
reader.GetString(1));
}
reader.Close();
}
catch(Exception e)
{
Console.WriteLine("Error Occurred: " + e);
}
finally
{
conn.Close();
}
}
}

</source>

==Result set info: field count and field type==

<source lang="csharp">
using System;
using System.Data;
using System.Data.SqlClient;
class ResultSetInfo{
static void Main(string[] args) {
string connString = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
string sql = @"select FirstName, LastName from Employee";
SqlConnection conn = new SqlConnection(connString);
try {
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn);
SqlDataReader reader = cmd.ExecuteReader();
Console.WriteLine("Column Name:\t{0} {1}", reader.GetName(0).PadRight(25),reader.GetName(1));
Console.WriteLine("Data Type:\t{0} {1}", reader.GetDataTypeName(0).PadRight(25), reader.GetDataTypeName(1));
Console.WriteLine("Number of columns in a row: {0}", reader.FieldCount);
Console.WriteLine(""{0}" is at index {1} and its type is: {2}",
reader.GetName(0),reader.GetOrdinal("FirstName"),reader.GetFieldType(0));
Console.WriteLine(""{0}" is at index {1} and its type is: {2}",
reader.GetName(1), reader.GetOrdinal("LastName"),reader.GetFieldType(1));
reader.Close();
}
catch(Exception e)
{
Console.WriteLine("Error Occurred: " + e);
}
finally
{
conn.Close();
}
}
}

</source>

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Csharp/C Sharp/Database ADO.net/Result Set - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия