Csharp/CSharp Tutorial/ADO.Net/SqlCommand Insert — различия между версиями
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Текущая версия на 12:19, 26 мая 2010
Содержание
Command NonQuery
using System;
using System.Data;
using System.Data.SqlClient;
class CommandNonQuery
{
static void Main()
{
SqlConnection conn = new SqlConnection(@"server = .\sqlexpress;integrated security = true;database = northwind");
string sqlqry = @"select count(*) from employees";
string sqlins = @"insert into employees(firstname,lastname)values("Z", "Z")";
string sqldel = @"delete from employees where firstname = "Z" and lastname = "Z"";
SqlCommand cmdqry = new SqlCommand(sqlqry, conn);
SqlCommand cmdnon = new SqlCommand(sqlins, conn);
try
{
conn.Open();
Console.WriteLine("Before INSERT: Number of employees {0}\n", cmdqry.ExecuteScalar());
Console.WriteLine("Executing statement {0}", cmdnon.rumandText);
cmdnon.ExecuteNonQuery();
Console.WriteLine("After INSERT: Number of employees {0}\n", cmdqry.ExecuteScalar());
cmdnon.rumandText = sqldel;
Console.WriteLine("Executing statement {0}", cmdnon.rumandText);
cmdnon.ExecuteNonQuery();
Console.WriteLine("After DELETE: Number of employees {0}\n", cmdqry.ExecuteScalar());
}
catch (SqlException ex)
{
Console.WriteLine(ex.ToString());
}
finally
{
conn.Close();
Console.WriteLine("Connection Closed.");
}
}
}
Execute nonquery to insert a record (row)
using System;
using System.Data;
using System.Data.SqlClient;
class MainClass
{
static void Main()
{
SqlConnection conn = new SqlConnection("server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;");
string sqlqry = @"select count(*) from employee ";
string sqlins = @"insert into employee (firstname,lastname)values("Z", "Z")";
string sqldel = @"delete from employee where firstname = "Z" and lastname = "Z"";
SqlCommand cmdqry = new SqlCommand(sqlqry, conn);
SqlCommand cmdnon = new SqlCommand(sqlins, conn);
try
{
conn.Open();
Console.WriteLine("Before INSERT: Number of employee {0}\n", cmdqry.ExecuteScalar());
Console.WriteLine("Executing statement {0}", cmdnon.rumandText);
cmdnon.ExecuteNonQuery();
Console.WriteLine("After INSERT: Number of employee {0}\n", cmdqry.ExecuteScalar());
cmdnon.rumandText = sqldel;
Console.WriteLine("Executing statement {0}", cmdnon.rumandText);
cmdnon.ExecuteNonQuery();
Console.WriteLine("After DELETE: Number of employee {0}\n", cmdqry.ExecuteScalar());
}
catch (SqlException ex)
{
Console.WriteLine(ex.ToString());
}
finally
{
conn.Close();
Console.WriteLine("Connection Closed.");
}
}
}
how to execute multiple SQL statements using a SqlCommand object
using System;
using System.Data;
using System.Data.SqlClient;
class ExecuteMultipleSQL {
public static void Main() {
SqlConnection mySqlConnection = new SqlConnection("server=localhost;database=Northwind;uid=sa;pwd=sa");
SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
mySqlCommand.rumandText =
"INSERT INTO Customers (CustomerID, CompanyName) " +
"VALUES ("J5COM", "Jason 5 Company");" +
"SELECT CustomerID, CompanyName " +
"FROM Customers " +
"WHERE CustomerID = "J5COM";" +
"UPDATE Customers " +
"SET CompanyName = "ACompany" " +
"WHERE CustomerID = "J5COM";" +
"SELECT CustomerID, CompanyName " +
"FROM Customers " +
"WHERE CustomerID = "J5COM";";
mySqlConnection.Open();
SqlDataReader mySqlDataReader = mySqlCommand.ExecuteReader();
do {
while (mySqlDataReader.Read()) {
Console.WriteLine("mySqlDataReader[0] = " + mySqlDataReader[0]);
Console.WriteLine("mySqlDataReader[1] = " + mySqlDataReader[1]);
}
Console.WriteLine(""); // visually split the results
} while (mySqlDataReader.NextResult());
mySqlDataReader.Close();
mySqlConnection.Close();
}
}
Inserting Data Using SQLStatements
using System;
using System.Data;
using System.Data.SqlClient;
class MainClass
{
static void Main(string[] args)
{
SqlConnection MyConnection = new SqlConnection("server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;");
MyConnection.Open();
String MyString = @"INSERT INTO Employee(ID, FirstName, LastName) VALUES(2, "G", "M")";
SqlCommand MyCmd = new SqlCommand(MyString, MyConnection);
MyCmd.ExecuteScalar();
MyConnection.Close();
}
}