Csharp/C Sharp by API/System.Data/DataSet
Содержание
DataSet.Delete
<source lang="csharp"> using System; using System.Collections.Generic; using System.Text; using System.Data; using System.Data.SqlClient; class Program {
static void Main(string[] args) {
DataSet theCarsInventory = new DataSet();
SqlConnection cn = new SqlConnection("server=(local);User ID=sa;Pwd=;database=Cars");
SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM Inventory", cn);
SqlCommandBuilder invBuilder = new SqlCommandBuilder(da);
da.Fill(theCarsInventory, "Inventory");
PrintDataSet(theCarsInventory);
try {
theCarsInventory.Tables["Inventory"].Rows[1].Delete();
da.Update(theCarsInventory, "Inventory");
} catch (Exception e) {
Console.WriteLine(e.Message);
}
theCarsInventory = new DataSet();
da.Fill(theCarsInventory, "Inventory");
PrintDataSet(theCarsInventory);
}
static void PrintDataSet(DataSet ds) {
Console.WriteLine("Tables in "{0}" DataSet.\n", ds.DataSetName);
foreach (DataTable dt in ds.Tables) {
Console.WriteLine("{0} Table.\n", dt.TableName);
for (int curCol = 0; curCol < dt.Columns.Count; curCol++) {
Console.Write(dt.Columns[curCol].ColumnName.Trim() + "\t");
}
for (int curRow = 0; curRow < dt.Rows.Count; curRow++) {
for (int curCol = 0; curCol < dt.Columns.Count; curCol++) {
Console.Write(dt.Rows[curRow][curCol].ToString().Trim() + "\t");
}
Console.WriteLine();
}
}
}
}
</source>
DataSet.Merge
<source lang="csharp"> using System; using System.Data; using System.Data.SqlClient; class Merge {
public static void Main()
{
SqlConnection mySqlConnection =new SqlConnection("server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;");
SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
mySqlCommand.rumandText =
"SELECT ID, FirstName, LastName, Address " +
"FROM Customers " +
"WHERE ID IN ("001", "002", "003")";
SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
mySqlDataAdapter.SelectCommand = mySqlCommand;
DataSet myDataSet = new DataSet();
mySqlConnection.Open();
mySqlDataAdapter.Fill(myDataSet, "Customers");
mySqlCommand.rumandText =
"SELECT ID, FirstName, LastName, Address " +
"FROM Customers " +
"WHERE CustomerID IN ("008", "009")";
DataSet myDataSet2 = new DataSet();
mySqlDataAdapter.Fill(myDataSet2, "Customers2");
mySqlCommand.rumandText =
"SELECT TOP 5 ProductID, ProductName, UnitPrice " +
"FROM Products " +
"ORDER BY ProductID";
DataSet myDataSet3 = new DataSet();
mySqlDataAdapter.Fill(myDataSet3, "Products");
mySqlConnection.Close();
myDataSet.Merge(myDataSet2);
myDataSet.Merge(myDataSet3, true, MissingSchemaAction.Add);
foreach (DataTable myDataTable in myDataSet.Tables) {
Console.WriteLine("\nReading from the " + myDataTable + "DataTable");
foreach (DataRow myDataRow in myDataTable.Rows) {
foreach (DataColumn myDataColumn in myDataTable.Columns) {
Console.WriteLine(myDataColumn + "= " + myDataRow[myDataColumn]);
}
}
}
}
}
</source>
DataSet.MergeFailed
<source lang="csharp"> using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Data.OleDb; public class MainClass {
public static void Main(){
OleDbConnection conn = new OleDbConnection();
string strDSN = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Northwind.mdb";
conn.ConnectionString = strDSN;
conn.Open();
string sql = "SELECT * FROM orders ";
OleDbDataAdapter da = new OleDbDataAdapter(sql, conn);
DataSet ds1 = new DataSet("ds1");
da.Fill(ds1);
sql = "SELECT * FROM Customers ";
da = new OleDbDataAdapter(sql, conn);
DataSet ds2 = new DataSet("ds2");
da.Fill(ds2);
ds1.MergeFailed += new MergeFailedEventHandler(OnMergeFailed);
ds1.Merge(ds2);
}
protected static void OnMergeFailed (object sender, MergeFailedEventArgs args)
{
MessageBox.Show(args.Conflict.ToString());
}
}
</source>
DataSet.Read
<source lang="csharp"> using System; using System.Data; // Use ADO.NET namespace using System.Data.SqlClient; // Use SQL Server data provider namespace using System.Collections.Generic; using System.Text; class Program {
static void Main(string[] args) {
SqlConnection thisConnection = new SqlConnection(
@"Server=(local)\sqlexpress;Integrated Security=True;" +
"Database=northwind");
SqlDataAdapter thisAdapter = new SqlDataAdapter(
"SELECT CustomerID, ContactName FROM Customers", thisConnection);
DataSet thisDataSet = new DataSet();
thisAdapter.Fill(thisDataSet, "Customers");
foreach (DataRow theRow in thisDataSet.Tables["Customers"].Rows) {
Console.WriteLine(theRow["CustomerID"] + "\t" +
theRow["ContactName"]);
}
thisConnection.Close();
}
}
</source>
DataSet.ReadXml
<source lang="csharp">
using System; using System.Data; using System.Collections.Generic; using System.Text; class Program {
static void Main(string[] args) {
DataSet thisDataSet = new DataSet();
thisDataSet.ReadXml("nwinddata.xml");
foreach (DataRow custRow in thisDataSet.Tables["Customers"].Rows) {
Console.WriteLine("Customer ID: " + custRow["CustomerID"] +
" Name: " + custRow["CompanyName"]);
}
Console.WriteLine("Table created by ReadXml is called {0}",
thisDataSet.Tables[0].TableName);
}
}
</source>
DataSet.Relations.Add
<source lang="csharp"> using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Configuration; using System.Data.SqlClient; public class Form1 : Form {
public Form1() {
InitializeComponent();
}
private void getData_Click(object sender, EventArgs e) {
string orders = "SELECT * FROM Orders";
string customers = "SELECT * FROM Customers";
using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["northwind"].ConnectionString)) {
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter(customers, con);
da.Fill(ds, "Customers");
da = new SqlDataAdapter(orders, con);
da.Fill(ds, "Orders");
ds.Relations.Add("CustomerOrders",
ds.Tables["Customers"].Columns["CustomerID"],
ds.Tables["Orders"].Columns["CustomerID"]);
dataGrid1.SetDataBinding(ds, "Customers");
}
}
private void InitializeComponent() {
this.getData = new System.Windows.Forms.Button();
this.dataGrid1 = new System.Windows.Forms.DataGrid();
((System.ruponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
this.SuspendLayout();
this.getData.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
this.getData.Location = new System.Drawing.Point(316, 299);
this.getData.Name = "getData";
this.getData.Size = new System.Drawing.Size(75, 23);
this.getData.TabIndex = 1;
this.getData.Text = "Get Data";
this.getData.UseVisualStyleBackColor = true;
this.getData.Click += new System.EventHandler(this.getData_Click);
this.dataGrid1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.dataGrid1.DataMember = "";
this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
this.dataGrid1.Location = new System.Drawing.Point(12, 12);
this.dataGrid1.Size = new System.Drawing.Size(379, 281);
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(403, 334);
this.Controls.Add(this.dataGrid1);
this.Controls.Add(this.getData);
((System.ruponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
this.ResumeLayout(false);
}
private System.Windows.Forms.Button getData;
private System.Windows.Forms.DataGrid dataGrid1;
[STAThread]
static void Main() {
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
</source>
DataSet.Tables
<source lang="csharp"> using System; using System.Data; using System.Data.SqlClient; class MultipleDataTables {
public static void Main()
{
SqlConnection mySqlConnection =new SqlConnection("server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;");
SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
mySqlCommand.rumandText =
"SELECT TOP 2 ID, FirstName, LastName " +
"FROM Employee " +
"ORDER BY ID;" +
"SELECT ID, LastName " +
"FROM MyEmployee " +
"WHERE ID = 9;";
SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
mySqlDataAdapter.SelectCommand = mySqlCommand;
DataSet myDataSet = new DataSet();
mySqlConnection.Open();
int numberOfRows = mySqlDataAdapter.Fill(myDataSet);
Console.WriteLine("numberOfRows = " + numberOfRows);
mySqlConnection.Close();
myDataSet.Tables["Table"].TableName = "Employee";
myDataSet.Tables["Table1"].TableName = "MyEmployee";
foreach (DataTable myDataTable in myDataSet.Tables) {
Console.WriteLine("\nReading from the " +
myDataTable.TableName + "DataTable");
foreach (DataRow myDataRow in myDataTable.Rows)
{
foreach (DataColumn myDataColumn in myDataTable.Columns)
{
Console.WriteLine(myDataColumn + "= " +
myDataRow[myDataColumn]);
}
}
}
}
}
</source>
DataSet.WriteXml
<source lang="csharp">
using System; using System.Data; using System.Data.SqlClient; class WriteAndReadXML {
public static void Main() {
SqlConnection mySqlConnection = new SqlConnection("server=localhost;database=Northwind;uid=sa;pwd=sa");
SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
mySqlCommand.rumandText =
"SELECT TOP 2 CustomerID, CompanyName, ContactName, " +
"Address " +
"FROM Customers " +
"ORDER BY CustomerID";
SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
mySqlDataAdapter.SelectCommand = mySqlCommand;
DataSet myDataSet = new DataSet();
mySqlConnection.Open();
mySqlDataAdapter.Fill(myDataSet, "Customers");
mySqlConnection.Close();
myDataSet.WriteXml("myXmlFile.xml");
myDataSet.WriteXml("myXmlFile2.xml", XmlWriteMode.WriteSchema);
myDataSet.WriteXmlSchema("myXmlSchemaFile.xml");
myDataSet.Clear();
myDataSet.ReadXml("myXmlFile.xml");
DataTable myDataTable = myDataSet.Tables["Customers"];
foreach (DataRow myDataRow in myDataTable.Rows) {
Console.WriteLine("CustomerID = " + myDataRow["CustomerID"]);
Console.WriteLine("CompanyName = " + myDataRow["CompanyName"]);
Console.WriteLine("ContactName = " + myDataRow["ContactName"]);
Console.WriteLine("Address = " + myDataRow["Address"]);
}
}
}
</source>
new DataSet(String data)
<source lang="csharp"> using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Data.Odbc; public class MainClass : System.Windows.Forms.Form {
private System.Windows.Forms.DataGrid dataGrid1;
public MainClass()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.dataGrid1 = new System.Windows.Forms.DataGrid();
((System.ruponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
this.SuspendLayout();
//
// dataGrid1
//
this.dataGrid1.DataMember = "";
this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
this.dataGrid1.Location = new System.Drawing.Point(0, 8);
this.dataGrid1.Name = "dataGrid1";
this.dataGrid1.Size = new System.Drawing.Size(376, 288);
this.dataGrid1.TabIndex = 0;
//
// MainClass
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(384, 302);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.dataGrid1});
this.Load += new System.EventHandler(this.MainClass_Load);
((System.ruponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
this.ResumeLayout(false);
}
[STAThread]
static void Main()
{
Application.Run(new MainClass());
}
private void MainClass_Load(object sender, System.EventArgs e)
{
string connectionString = @"Driver={MySQL};SERVER=localhost;DATABASE=NorthwindMySQL;";
OdbcConnection conn= new OdbcConnection(connectionString);
conn.Open();
OdbcDataAdapter da = new OdbcDataAdapter ("SELECT CustomerID, ContactName, ContactTitle FROM Customers", conn);
DataSet ds = new DataSet("Cust");
da.Fill(ds, "Customers");
dataGrid1.DataSource = ds.DefaultViewManager;
conn.Close();
}
}
</source>
