ADO. Net SqlDataAdapter object

5.1 What is the SqlDataAdapter

5.1.2 Create and use SqlDataAdapter object

strSQL ="select  * From tbname";

SqlConnection = new SqlConnection(strConnection);

SqlCommand = new SqlCommand(strSQL,cn);

SqlDataAdapter da = new SqlDataAdapter();

da.SelectCommand = cmd

SqlDataAdapter Constructors

// Pass the connection string , This method will generate a new SqlConnection object

SqlDataAdapter da = new SqlDataAdapter(strSQL,strConnection);

// Transfer connection object

SqlDataAdapter da = new SqlDataAdapter(strSQL,cn);

// Pass on SqlCommand object

SqlCommand cmd = new SqlCommand(strSQL,cn);

SqlDataAdapter da = new SqlDataAdapter(cmd);

5.2.2 Get the results from the query

1. Use Fill() Method

call SqlDataAdapter Class Fill Method will be executed and stored in SqlDataAdapter Medium SqlCommand Queries in object properties , And store the results in DataSet.

The following code calls Fill Method , And display stored in DataSet Results in

// There is no time to sleep , Hurry up , Years do not bite , Time blows old .

strSQL ="select userName,userID From customers";

DataSet ds = new DataSet();

SqlDataAdapter da = new SqlDataAdapter(strSQL,strConnection);

da.Fill(ds);

foreach(DataRow row in ds.Tables[0].Rows)

  Console.Write("{0} - {1}",Row["userID"],row["userName"]);

// there Fil Method implicit l Create a DataTable object , also TableName yes "Table"

The description of this value is poor , You can customize the filled tableName

SqlDataAdapter da = new SqlDataAdapter(strSQL,cn);

da.TableMappings.Add("Table","customers");// Add table name

DataSet ds = new DataSet();

da.Fill(ds);

Console.Write("Table ={0}",ds.Tables[0].TableName);

// You can also specify Fill Parameters , Do not add table names manually

5.2.2 Get the results from the query

4. Using overloaded Fill Method

strSQL ="Select * From customers";

SqlCommand cmd = new SqlCommand(strSQL,cn);

SqlDataAdapter da = new SqlDataAdapter(cmd);

DataTable dt = new DataTable();

da.Fill(dt);

foreach(DataRow row in dt.Rows)

Console.Write("{0}-{1}",row[1],row[2]);

use SqlDataAdapter Class Fill Method Pagination

// From the first record , fill 20 Record to "Products" Of DataTable in

SqlDataAdapter.Fill(DataSet,0,20,"Products");

// This method makes it easy to page queries , But its efficiency is relatively low .