8.5.15 getBoolean(int columnIndex) : Hitachi Advanced Database Application Development Guide

(1) Function

This method acquires as boolean 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 boolean getBoolean(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 true or false. The following table shows the relationship between the retrieval result and the return value.

Table 8‒21: Relationship between the retrieval result and the return value (getBoolean method)
HADB data type	Retrieval result	Return value
`CHAR` `VARCHAR`	Null value	`false`
	`[space]1[space]`	`true`
	Other than the above	`false`
`SMALLINT`	Null value	`false`
	`0`	`false`
	Other than the above	`true`
`INTEGER`	Null value	`false`
	`0`	`false`
	Other than the above	`true`
`DECIMAL`	Null value	`false`
	`0[.00...0]`	`false`
	Other than the above	`true`
`DOUBLE` `PRECISION`	Null value	`false`
	`0.0` or `-0.0`	`false`
	Other than the above	`true`
`BOOLEAN`^#	Null value	`false`
`BOOLEAN`^#	Non-null value	`retrieval-result`
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.
An error occurred in the JDBC driver.

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