8.5.21 getCharacterStream(int columnIndex)

(1) Function

This method acquires in a java.io.Reader object 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 Reader getCharacterStream(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 a java.io.Reader object containing the column value. The following table shows the relationship between the retrieval result and the return value.

Table 8‒24: Relationship between the retrieval result and the return value (getCharacterStream method)

HADB data type	Retrieval result	Return value
CHAR VARCHAR BINARY VARBINARY	Null value	null
	Other than the above	java.io.Reader object containing the retrieval result
Other	Not applicable	SQLException is thrown.

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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.

• Encoding failed.

• An error occurred in the JDBC driver.

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