Schema Collections

The Schema collections return metadata for the Advanced SQL Engine objects. The notable metadata columns for the Interval Day data type are:

Column Name	Description
COLUMN_TYPE or DATA_TYPE	Set to INTERVAL DAY.
FORMAT	Format assigned to the SQL Engine object.
PROVIDERDBTYPE	It is set to TdType.IntervalDay.
INTERVAL_PRECISION	The maximum number of digits for the Day component.

Schema Table

The TdDataReader.SchemaTable returns result set metadata. The notable metadata columns for the Interval Day data type are:

Column Name	Description
NumericPrecision	The maximum number of digits for the Day component.
DataType	System.Type object for the System.TimeSpan structure.
ProviderType	Set to TdType.IntervalDay.
Format	Format assigned to the SQL Engine object.
ProviderSpecificDataType	System.Type object for the TdIntervalDay structure.

Configuring Parameters

The following example shows how to configure an Interval Day parameter using DbType type declaration and a Base Class Library (BCL) value. The TdParameter.Precision property reflects the maximum number of digits for the Day component and it must be equal to or less than the target SQL Engine object (i.e. Column, Expression, Stored Procedure Parameters and etc.) declaration. The range of values are from One to Four.

Note
The Data Provider will throw an exception if the Day component of the System.TimeSpan value is greater than 9,999 Days. The Data Provider will throw an exception if the System.TimeSpan.Days property is greater than the range specified by TdParameter.Precision property.

Note
The Data Provider truncates the Hours, Minutes, Seconds and Milliseconds components of the System.TimeSpan vlaue.

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TdParameter deliveryInterval = new TdParameter(); deliveryInterval.ParameterName = "deliveryDays"; deliveryInterval.DbType = DbType.Object; // Maximum number of Day digits deliveryInterval.Precision = 2; deliveryInterval.Value = new System.TimeSpan(9, 0, 0, 0);

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TdParameter deliveryInterval = new TdParameter();
deliveryInterval.ParameterName = "deliveryDays";

deliveryInterval.DbType = DbType.Object;

// Maximum number of Day digits
deliveryInterval.Precision = 2;

deliveryInterval.Value = new System.TimeSpan(9, 0, 0, 0);

The following example shows how to configure an Interval Day parameter using TdType type declaration and a Provider Specific value. It is recommend to always set TdParameter.Precision property, however the Data Provider will utilize TdIntervalDay.Precision property value when the TdParameter.Precision property is set to zero. .NET Applications can retrieve metadata from the Schema Collections or the Schema Table and apply the metadata to the TdParameter object.

Note
The Data Provider will throw an exception if the Interval Value is greater than the maximum permissible value specified by the TdParameter.Precision property.

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TdParameter deliveryInterval = new TdParameter(); deliveryInterval.ParameterName = "deliveryDays"; deliveryInterval.TdType = TdType.IntervalDay; // Maximum number of Day digits deliveryInterval.Precision = 2; deliveryInterval.ProviderSpecificValue = new TdIntervalDay(9);

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TdParameter deliveryInterval = new TdParameter();
deliveryInterval.ParameterName = "deliveryDays";

deliveryInterval.TdType = TdType.IntervalDay;

// Maximum number of Day digits
deliveryInterval.Precision = 2;

deliveryInterval.ProviderSpecificValue = new TdIntervalDay(9);

Specifying Interval Day as Literal

The syntax for the Interval Day Literal is INTERVALsign'dddd'DAY. Interval Day literals consist of the word Interval followed by optional negative sign, character string literal representation of the number of days (up to 4 digits) and the word Day.

Note
We recommend to always use Parameters in order to take advantage of the SQL Engine's Request Cache.

The following example shows 10 Days represented as Interval Day Literal in the Command Text.

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using (TdConnection cn = new TdConnection("data source=x;UserId=y;Password=z;")) { cn.Open(); TdCommand cmd = cn.CreateCommand(); // Delivery exceeding 10 days. cmd.CommandText = "SELECT Id, orderDate from Order where (CURRENT_DATE - OrderDate) > INTERVAL'10'DAY "; using (TdDataReader reader = cmd.ExecuteReader()) { if (reader.HasRows) { while (reader.Read()) { Console.WriteLine("Id={0}", reader.GetInt64(0).ToString()); } } } }

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using (TdConnection cn = new TdConnection("data source=x;UserId=y;Password=z;"))
{
    cn.Open();
    TdCommand cmd = cn.CreateCommand();

    // Delivery exceeding 10 days.
    cmd.CommandText = "SELECT Id, orderDate from Order where (CURRENT_DATE - OrderDate) > INTERVAL'10'DAY ";

    using (TdDataReader reader = cmd.ExecuteReader())
    {
        if (reader.HasRows)
        {
            while (reader.Read())
            {
                Console.WriteLine("Id={0}", reader.GetInt64(0).ToString());
            }
        }
    }
}

Retrieving Interval Day Data

The following methods and properties return the column or parameter value as a System.TimeSpan structure.

The following methods and properties return the column or parameter value as a TdIntervalDay structure.

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using (TdConnection cn = new TdConnection("data source=DS1;UserId=Joe;Password=XY;")) { cn.Open(); TdCommand cmd = cn.CreateCommand(); cmd.CommandText = "SELECT Id, orderDate, deliveryDays from Order where deliveryDays > ?"; cmd.Parameters.Add("deliveryDays", TdType.IntervalDay); cmd.Parameters[0].Precison = 2; cmd.Parameters[0].Value = new TimeSpan(10, 0, 0, 0); using (TdDataReader reader = cmd.ExecuteReader()) { if (reader.HasRows) { while (reader.Read()) { Console.WriteLine("[TimeSpan] Delivery Days = {0}", reader.GetValue(2).ToString()); Console.WriteLine("[TdIntervalDay] Delivery Days = {0}", reader.GetTdIntervalDay(2).ToString()); } } } } /* Output: [TimeSpan] Delivery Days = 11.00:00:00.0000000 [TdIntervalDay] Delivery Days = 11 */

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using (TdConnection cn = new TdConnection("data source=DS1;UserId=Joe;Password=XY;"))
{
    cn.Open();

    TdCommand cmd = cn.CreateCommand();
    cmd.CommandText = "SELECT Id, orderDate, deliveryDays from Order where deliveryDays > ?";
    cmd.Parameters.Add("deliveryDays", TdType.IntervalDay);
    cmd.Parameters[0].Precison = 2;
    cmd.Parameters[0].Value = new TimeSpan(10, 0, 0, 0);

    using (TdDataReader reader = cmd.ExecuteReader())
    {
        if (reader.HasRows)
        {
            while (reader.Read())
            {
                Console.WriteLine("[TimeSpan] Delivery Days = {0}", reader.GetValue(2).ToString());
                Console.WriteLine("[TdIntervalDay] Delivery Days = {0}", reader.GetTdIntervalDay(2).ToString());
            }
        }
    }
}

/* Output:
    [TimeSpan] Delivery Days = 11.00:00:00.0000000
    [TdIntervalDay] Delivery Days = 11
*/

Schema Collections

Schema Table

Configuring Parameters

Specifying Interval Day as Literal

Retrieving Interval Day Data

See Also