Mega Code Archive
Read schema information using the FillSchema() method of a DataAdapter object
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using System;
using System.Data;
using System.Data.SqlClient;
class FillSchema
{
public static void Main()
{
SqlConnection mySqlConnection =new SqlConnection("server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;");
SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
mySqlCommand.CommandText =
"SELECT ProductID, ProductName " +
"FROM Products;" +
"SELECT OrderID " +
"FROM Orders;" +
"SELECT OrderID, ProductID, UnitPrice " +
"FROM [Order Details];";
SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
mySqlDataAdapter.SelectCommand = mySqlCommand;
DataSet myDataSet = new DataSet();
mySqlConnection.Open();
mySqlDataAdapter.FillSchema(myDataSet, SchemaType.Mapped);
mySqlConnection.Close();
myDataSet.Tables["Table"].TableName = "Products";
myDataSet.Tables["Table1"].TableName = "Orders";
myDataSet.Tables["Table2"].TableName = "Order Details";
foreach (DataTable myDataTable in myDataSet.Tables)
{
Console.WriteLine("\n\nReading from the " +
myDataTable + "DataTable:\n");
foreach (DataColumn myPrimaryKey in myDataTable.PrimaryKey)
{
Console.WriteLine("myPrimaryKey = " + myPrimaryKey);
}
foreach (Constraint myConstraint in myDataTable.Constraints)
{
Console.WriteLine("myConstraint.IsPrimaryKey = " + ((UniqueConstraint) myConstraint).IsPrimaryKey);
foreach (DataColumn myDataColumn in ((UniqueConstraint) myConstraint).Columns)
{
Console.WriteLine("myDataColumn.ColumnName = " + myDataColumn.ColumnName);
}
}
foreach (DataColumn myDataColumn in myDataTable.Columns)
{
Console.WriteLine("\nmyDataColumn.ColumnName = " + myDataColumn.ColumnName);
Console.WriteLine("myDataColumn.DataType = " + myDataColumn.DataType);
Console.WriteLine("myDataColumn.AllowDBNull = " + myDataColumn.AllowDBNull);
Console.WriteLine("myDataColumn.AutoIncrement = " + myDataColumn.AutoIncrement);
Console.WriteLine("myDataColumn.AutoIncrementSeed = " + myDataColumn.AutoIncrementSeed);
Console.WriteLine("myDataColumn.AutoIncrementStep = " + myDataColumn.AutoIncrementStep);
Console.WriteLine("myDataColumn.MaxLength = " + myDataColumn.MaxLength);
Console.WriteLine("myDataColumn.ReadOnly = " + myDataColumn.ReadOnly);
Console.WriteLine("myDataColumn.Unique = " + myDataColumn.Unique);
}
}
}
}
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