8.5.29 getDouble(int columnIndex) : Hitachi Advanced Database Application Development Guide

(1) Function

This method acquires as double 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 double getDouble(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 8‒26: Relationship between the retrieval result and the return value (getDouble method)
HADB data type	Retrieval result	Return value
`CHAR` `VARCHAR`	Null value	`0.0`
	`[space]integer-in-character-string-representation`, `decimal-number-in-character-string-representation`, or `floating-point-number-in-character-string-representation[space]`, and `-Double.MAX_VALUE` or greater, and `Double.MIN_VALUE` or less, and `Double.MIN_VALUE` or greater, and `Double.MAX_VALUE` or less	Retrieval result converted to a `double` 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 `Double.MAX_VALUE`	`Infinity`
	`[space]integer-in-character-string-representation`, `decimal-number-in-character-string-representation`, or `floating-point-number-in-character-string-representation[space]`, and less than `-Double.MAX_VALUE`	`-Infinity`
	`[space]integer-in-character-string-representation`, `decimal-number-in-character-string-representation`, or `floating-point-number-in-character-string-representation[space]`, and less than `Double.MIN_VALUE`, and greater than 0	`0.0`
	`[space]integer-in-character-string-representation`, `decimal-number-in-character-string-representation`, or `floating-point-number-in-character-string-representation[space]`, and greater than `-Double.MIN_VALUE,` and less than 0	`-0.0`
	`[space]-Infinity[space]`	`-Infinity`
	`[space][+]Infinity[space]`	`Infinity`
	`[space][+\|-]NaN[space]`	`NaN`
	Other than the above (cannot be converted to a `double` value)	`SQLException` is thrown.
`SMALLINT`	Null value	`0.0`
`SMALLINT`	Other than the above	Retrieval result converted to a `double` value
`INTEGER`	Null value	`0.0`
`INTEGER`	Other than the above	Retrieval result converted to a `double` value
`DECIMAL`	Null value	`0.0`
`DECIMAL`	Other than the above	Retrieval result converted to a `double` value
`DOUBLE` `PRECISION`	Null value	`0.0`
`DOUBLE` `PRECISION`	Other than the above	Retrieval result converted to a `double` value
`BOOLEAN`^#	Null value	`0.0`
	`true`	`1.0`
	`false`	`0.0`
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 double.
An error occurred in the JDBC driver.

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