Class DataTypeUtilities

java.lang.Object
org.apache.derby.iapi.types.DataTypeUtilities
public abstract class DataTypeUtilities extends Object
A set of static utility methods for data types.

  • Constructor Details

    • DataTypeUtilities

      public DataTypeUtilities()

  • Method Details

    • clone

      public static Timestamp clone(Timestamp original)
      Clone a Timestamp because they are mutable

    • getPrecision

      public static int getPrecision(DataTypeDescriptor dtd)
      Get the precision of the datatype.
      Parameters:
      dtd - data type descriptor

    • getDigitPrecision

      public static int getDigitPrecision(DataTypeDescriptor dtd)
      Get the precision of the datatype, in decimal digits This is used by EmbedResultSetMetaData.
      Parameters:
      dtd - data type descriptor

    • isCaseSensitive

      public static boolean isCaseSensitive(DataTypeDescriptor dtd)
      Is the data type case sensitive.
      Parameters:
      dtd - data type descriptor

    • isNullable

      public static int isNullable(DataTypeDescriptor dtd)
      Is the data type nullable.
      Parameters:
      dtd - data type descriptor

    • isSigned

      public static boolean isSigned(DataTypeDescriptor dtd)
      Is the data type signed.
      Parameters:
      dtd - data type descriptor

    • getColumnDisplaySize

      public static int getColumnDisplaySize(DataTypeDescriptor dtd)
      Gets the display width of a column of a given type.
      Parameters:
      dtd - data type descriptor
      Returns:
      associated column display width

    • getColumnDisplaySize

      public static int getColumnDisplaySize(int typeId, int storageLength)

    • computeMaxWidth

      public static int computeMaxWidth(int precision, int scale)
      Compute the maximum width (column display width) of a decimal or numeric data value, given its precision and scale.
      Parameters:
      precision - The precision (number of digits) of the data value.
      scale - The number of fractional digits (digits to the right of the decimal point).
      Returns:
      The maximum number of chracters needed to display the value.