Schema Details

The ADO.NET provider for Snowflake supports schema discovery using ADO.NET classes or SQL statements to the system tables. The GetSchema method can be used to retrieve the schema of the Database and DataTables.

The following code shows how the GetSchema method is called which returns Tables in the Database. In the second call, the method returns the columns of a specific data table.

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static void SchemaDetails() { //Create and open connection C1SnowflakeConnection conn = new C1SnowflakeConnection(connectionString); conn.Open(); //Get Schema Details: //Get table names DataTable databaseTables = conn.GetSchema("Tables"); Console.WriteLine("List of Tables in database: \n"); foreach (DataRow row in databaseTables.Rows) { //Display table names string tableName = row["TableName"].ToString(); Console.WriteLine(tableName); } //Get column names in a table Console.WriteLine("Columns in table CALL_CENTER: \n"); DataTable dtColumnsSchema = conn.GetSchema("Columns", new string[] { "CALL_CENTER" }); foreach (DataRow crow in dtColumnsSchema.Rows) { Console.WriteLine(crow["ColumnName"].ToString() + "\t" + crow["DataType"].ToString()); } //Close Connection conn.Close(); }

Copy Code

static void SchemaDetails()
{
    //Create and open connection
    C1SnowflakeConnection conn = new C1SnowflakeConnection(connectionString);
    conn.Open();
    //Get Schema Details:
    //Get table names
    DataTable databaseTables = conn.GetSchema("Tables");
    Console.WriteLine("List of Tables in database: \n");
    foreach (DataRow row in databaseTables.Rows)
    {
        //Display table names
        string tableName = row["TableName"].ToString();
        Console.WriteLine(tableName);
    }
    //Get column names in a table
    Console.WriteLine("Columns in table CALL_CENTER: \n");
    DataTable dtColumnsSchema = conn.GetSchema("Columns", new string[] { "CALL_CENTER" });
    foreach (DataRow crow in dtColumnsSchema.Rows)
    {
        Console.WriteLine(crow["ColumnName"].ToString() + "\t" + crow["DataType"].ToString());
    }
    //Close Connection
    conn.Close();
}

Similar to the GetSchema method, you can also use GetSchemaTable method of the C1DataReader class. The GetSchemaTable method returns a DataTable that defines the column metadata.