Dapper official translation Tutorial 2: Execute Dapper method of

December 20, 2018 16:28:35 Day_and_Night_2017 Reads: 157

Execute methods are described:

Execute Dapper is an extension of the operation of the database, it can be called by IDbConnection object. It can execute a command one or more times, the return type is the number of rows affected. This method is typically used to perform:

Procedure the Stored (stored procedures)
Of Statement INSERT (insert statement)
Of Statement UPDATE (update statement)
Of Statement DELETE (delete statement)

The method may pass parameters:

Execute method Parameter Description
parameter name	Parameter Meaning
Sql	Executable database statements
param	Placeholder parameters command
transaction	Office work
commandTimeout	Timeout period
commandType	Command Type

Example: execute stored procedure

Execute a stored procedure:

string sql = "Invoice_Insert";
using (var connection = My.ConnectionFactory())
{
var affectedRows = connection.Execute(sql,
new {Kind = InvoiceKind.WebInvoice, Code = "Single_Insert_1"},
commandType: CommandType.StoredProcedure);
My.Result.Show(affectedRows);
}

Perform multiple stored procedure:

string sql = "Invoice_Insert";
using (var connection = My.ConnectionFactory())
{
var affectedRows = connection.Execute(sql,
new[]
{
new {Kind = InvoiceKind.WebInvoice, Code = "Many_Insert_1"},
new {Kind = InvoiceKind.WebInvoice, Code = "Many_Insert_2"},
new {Kind = InvoiceKind.StoreInvoice, Code = "Many_Insert_3"}
},
commandType: CommandType.StoredProcedure
);
My.Result.Show(affectedRows);
}

Example: Execute execute insert statement

Execute a single insert:

string sql = "INSERT INTO Customers (CustomerName) Values (@CustomerName);";
using (var connection = new SqlCeConnection("Data Source=SqlCe_W3Schools.sdf"))
{
var affectedRows = connection.Execute(sql, new {CustomerName = "Mark"});
Console.WriteLine(affectedRows);
var customer = connection.Query<Customer>("Select * FROM CUSTOMERS WHERE CustomerName = 'Mark'").ToList();
FiddleHelper.WriteTable(customer);
}

Execute multiple Insert:

string sql = "INSERT INTO Customers (CustomerName) Values (@CustomerName);";
using (var connection = new SqlCeConnection("Data Source=SqlCe_W3Schools.sdf"))
{
connection.Open();
var affectedRows = connection.Execute(sql,
new[]
{
new {CustomerName = "John"},
new {CustomerName = "Andy"},
new {CustomerName = "Allan"}
}
);
Console.WriteLine(affectedRows);

Example: Execute the update statement

Execute a single update:

string sql = "UPDATE Categories SET Description = @Description WHERE CategoryID = @CategoryID;";
using (var connection = new SqlCeConnection("Data Source=SqlCe_W3Schools.sdf"))
{
var affectedRows = connection.Execute(sql,new {CategoryID = 1, Description = "Soft drinks, coffees, teas, beers, mixed drinks, and ales"});
Console.WriteLine(affectedRows);
}

Executing multiple update:

string sql = "UPDATE Categories SET Description = @Description WHERE CategoryID = @CategoryID;";
using (var connection = new SqlCeConnection("Data Source=SqlCe_W3Schools.sdf"))
{
var affectedRows = connection.Execute(sql,
new[]
{
new {CategoryID = 1, Description = "Soft drinks, coffees, teas, beers, mixed drinks, and ales"},
new {CategoryID = 4, Description = "Cheeses and butters etc."}
}
);
Console.WriteLine(affectedRows);

Example: Execute a delete operation

Execute a single deleted:

string sql = "DELETE FROM Customers WHERE CustomerID = @CustomerID";
using (var connection = new SqlCeConnection("Data Source=SqlCe_W3Schools.sdf"))
{
var affectedRows = connection.Execute(sql, new {CustomerID = 1});
Console.WriteLine(affectedRows);
}

Execute multiple deleted:

string sql = "DELETE FROM OrderDetails WHERE OrderDetailID = @OrderDetailID";
using (var connection = new SqlCeConnection("Data Source=SqlCe_W3Schools.sdf"))
{
var affectedRows = connection.Execute(sql,
new[]
{
new {OrderDetailID = 1},
new {OrderDetailID = 2},
new {OrderDetailID = 3}
}
);
Console.WriteLine(affectedRows);