8.5.17 getByte(int columnIndex)

(1) Function

This method acquires as byte in the Java programming language the value in a specified column in the current row of the ResultSet object. The column whose value is to be acquired is specified in the argument.

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(2) Format

public synchronized byte getByte(int columnIndex) throws SQLException

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(3) Arguments

int columnIndex

Specifies a column number.

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(4) Return value

This method returns the column value. The following table shows the relationship between the retrieval result and the return value.

Table 8‒22: Relationship between the retrieval result and the return value (getByte method)

HADB data type	Retrieval result	Return value
CHAR VARCHAR	Null value	0
	[space]integer-in-character-string-representation, decimal-number-in-character-string-representation, or floating-point-number-in-character-string-representation[space], and Byte.MIN_VALUE or greater, and Byte.MAX_VALUE or less	Retrieval result converted to a byte value
	[space]integer-in-character-string-representation, decimal-number-in-character-string-representation, or floating-point-number-in-character-string-representation[space], and greater than Byte.MAX_VALUE or less than Byte.MIN_VALUE	SQLException is thrown.
	[space][+]Infinity[space]
	[space]-Infinity[space]
	[space][+|-]NaN[space]
	Other than the above
SMALLINT	Null value	0
	Byte.MIN_VALUE or greater and Byte.MAX_VALUE or less	Retrieval result converted to a byte value
	Other than the above	SQLException is thrown.
INTEGER	Null value	0
	Byte.MIN_VALUE or greater and Byte.MAX_VALUE or less	Retrieval result converted to a byte value
	Other than the above	SQLException is thrown.
DECIMAL	Null value	0
	Byte.MIN_VALUE or greater and Byte.MAX_VALUE or less	Integer part of the retrieval result converted to a byte value
	Other than the above	SQLException is thrown.
DOUBLE PRECISION	Null value	0
	Byte.MIN_VALUE or greater and Byte.MAX_VALUE or less	Integer part of the retrieval result converted to a byte value
	Other than the above	SQLException is thrown.
BOOLEAN#	Null value	0
	true	1
	false	0
Other	Not applicable	SQLException is thrown.

#

BOOLEAN-type data exists when the ResultSet object was created from DatabaseMetadata.

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(5) Exceptions

The JDBC driver throws an SQLException in the following cases:

• This ResultSet object is closed.

  This includes the case where the ResultSet object was closed because the Statement object that created this ResultSet object was closed.

• The Connection used to create the Statement object that created this ResultSet object has been closed.

• The ResultSet object has become invalid due to transaction settlement.

• A nonexistent column number was specified.

• The data type cannot be acquired by this method.

• The column value cannot be acquired as byte.

• An error occurred in the JDBC driver.

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