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	/*
	* Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package javax.sql.rowset;

	import java.sql.*;
	import javax.sql.*;
	import java.io.*;

	import java.lang.reflect.*;

	/**
	* Provides implementations for the methods that set and get
	* metadata information about a <code>RowSet</code> object's columns.
	* A <code>RowSetMetaDataImpl</code> object keeps track of the
	* number of columns in the rowset and maintains an internal array
	* of column attributes for each column.
	* <P>
	* A <code>RowSet</code> object creates a <code>RowSetMetaDataImpl</code>
	* object internally in order to set and retrieve information about
	* its columns.
	* <P>
	* NOTE: All metadata in a <code>RowSetMetaDataImpl</code> object
	* should be considered as unavailable until the <code>RowSet</code> object
	* that it describes is populated.
	* Therefore, any <code>RowSetMetaDataImpl</code> method that retrieves information
	* is defined as having unspecified behavior when it is called
	* before the <code>RowSet</code> object contains data.
	*
	* @since 1.5
	*/
	public class RowSetMetaDataImpl implements RowSetMetaData, Serializable {

	/**
	* The number of columns in the <code>RowSet</code> object that created
	* this <code>RowSetMetaDataImpl</code> object.
	* @serial
	*/
	private int colCount;

	/**
	* An array of <code>ColInfo</code> objects used to store information
	* about each column in the <code>RowSet</code> object for which
	* this <code>RowSetMetaDataImpl</code> object was created. The first
	* <code>ColInfo</code> object in this array contains information about
	* the first column in the <code>RowSet</code> object, the second element
	* contains information about the second column, and so on.
	* @serial
	*/
	private ColInfo[] colInfo;

	/**
	* Checks to see that the designated column is a valid column number for
	* the <code>RowSet</code> object for which this <code>RowSetMetaDataImpl</code>
	* was created. To be valid, a column number must be greater than
	* <code>0</code> and less than or equal to the number of columns in a row.
	* @throws SQLException with the message "Invalid column index"
	* if the given column number is out of the range of valid column
	* numbers for the <code>RowSet</code> object
	*/
	private void checkColRange(int col) throws SQLException {
	if (col <= 0 \|\| col > colCount) {
	throw new SQLException("Invalid column index :"+col);
	}
	}

	/**
	* Checks to see that the given SQL type is a valid column type and throws an
	* <code>SQLException</code> object if it is not.
	* To be valid, a SQL type must be one of the constant values
	* in the <code><a href="../../sql/Types.html">java.sql.Types</a></code>
	* class.
	*
	* @param SQLType an <code>int</code> defined in the class <code>java.sql.Types</code>
	* @throws SQLException if the given <code>int</code> is not a constant defined in the
	* class <code>java.sql.Types</code>
	*/
	private void checkColType(int SQLType) throws SQLException {
	try {
	Class<?> c = java.sql.Types.class;
	Field[] publicFields = c.getFields();
	int fieldValue = 0;
	for (int i = 0; i < publicFields.length; i++) {
	fieldValue = publicFields[i].getInt(c);
	if (fieldValue == SQLType) {
	return;
	}
	}
	} catch (Exception e) {
	throw new SQLException(e.getMessage());
	}
	throw new SQLException("Invalid SQL type for column");
	}

	/**
	* Sets to the given number the number of columns in the <code>RowSet</code>
	* object for which this <code>RowSetMetaDataImpl</code> object was created.
	*
	* @param columnCount an <code>int</code> giving the number of columns in the
	* <code>RowSet</code> object
	* @throws SQLException if the given number is equal to or less than zero
	*/
	public void setColumnCount(int columnCount) throws SQLException {

	if (columnCount <= 0) {
	throw new SQLException("Invalid column count. Cannot be less " +
	"or equal to zero");
	}

	colCount = columnCount;

	// If the colCount is Integer.MAX_VALUE,
	// we do not initialize the colInfo object.
	// even if we try to initialize the colCount with
	// colCount = Integer.MAx_VALUE-1, the colInfo
	// initialization fails throwing an ERROR
	// OutOfMemory Exception. So we do not initialize
	// colInfo at Integer.MAX_VALUE. This is to pass TCK.

	if(!(colCount == Integer.MAX_VALUE)) {
	colInfo = new ColInfo[colCount + 1];

	for (int i=1; i <= colCount; i++) {
	colInfo[i] = new ColInfo();
	}
	}


	}

	/**
	* Sets whether the designated column is automatically
	* numbered, thus read-only, to the given <code>boolean</code>
	* value.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns
	* in the rowset, inclusive
	* @param property <code>true</code> if the given column is
	* automatically incremented; <code>false</code>
	* otherwise
	* @throws SQLException if a database access error occurs or
	* the given index is out of bounds
	*/
	public void setAutoIncrement(int columnIndex, boolean property) throws SQLException {
	checkColRange(columnIndex);
	colInfo[columnIndex].autoIncrement = property;
	}

	/**
	* Sets whether the name of the designated column is case sensitive to
	* the given <code>boolean</code>.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns
	* in the rowset, inclusive
	* @param property <code>true</code> to indicate that the column
	* name is case sensitive; <code>false</code> otherwise
	* @throws SQLException if a database access error occurs or
	* the given column number is out of bounds
	*/
	public void setCaseSensitive(int columnIndex, boolean property) throws SQLException {
	checkColRange(columnIndex);
	colInfo[columnIndex].caseSensitive = property;
	}

	/**
	* Sets whether a value stored in the designated column can be used
	* in a <code>WHERE</code> clause to the given <code>boolean</code> value.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number
	* of columns in the rowset, inclusive
	* @param property <code>true</code> to indicate that a column
	* value can be used in a <code>WHERE</code> clause;
	* <code>false</code> otherwise
	*
	* @throws SQLException if a database access error occurs or
	* the given column number is out of bounds
	*/
	public void setSearchable(int columnIndex, boolean property)
	throws SQLException {
	checkColRange(columnIndex);
	colInfo[columnIndex].searchable = property;
	}

	/**
	* Sets whether a value stored in the designated column is a cash
	* value to the given <code>boolean</code>.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns,
	* inclusive between <code>1</code> and the number of columns, inclusive
	* @param property true if the value is a cash value; false otherwise.
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public void setCurrency(int columnIndex, boolean property)
	throws SQLException {
	checkColRange(columnIndex);
	colInfo[columnIndex].currency = property;
	}

	/**
	* Sets whether a value stored in the designated column can be set
	* to <code>NULL</code> to the given constant from the interface
	* <code>ResultSetMetaData</code>.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @param property one of the following <code>ResultSetMetaData</code> constants:
	* <code>columnNoNulls</code>,
	* <code>columnNullable</code>, or
	* <code>columnNullableUnknown</code>
	*
	* @throws SQLException if a database access error occurs,
	* the given column number is out of bounds, or the value supplied
	* for the <i>property</i> parameter is not one of the following
	* constants:
	* <code>ResultSetMetaData.columnNoNulls</code>,
	* <code>ResultSetMetaData.columnNullable</code>, or
	* <code>ResultSetMetaData.columnNullableUnknown</code>
	*/
	public void setNullable(int columnIndex, int property) throws SQLException {
	if ((property < ResultSetMetaData.columnNoNulls) \|\|
	property > ResultSetMetaData.columnNullableUnknown) {
	throw new SQLException("Invalid nullable constant set. Must be " +
	"either columnNoNulls, columnNullable or columnNullableUnknown");
	}
	checkColRange(columnIndex);
	colInfo[columnIndex].nullable = property;
	}

	/**
	* Sets whether a value stored in the designated column is a signed
	* number to the given <code>boolean</code>.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @param property <code>true</code> to indicate that a column
	* value is a signed number;
	* <code>false</code> to indicate that it is not
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public void setSigned(int columnIndex, boolean property) throws SQLException {
	checkColRange(columnIndex);
	colInfo[columnIndex].signed = property;
	}

	/**
	* Sets the normal maximum number of chars in the designated column
	* to the given number.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @param size the maximum size of the column in chars; must be
	* <code>0</code> or more
	* @throws SQLException if a database access error occurs,
	* the given column number is out of bounds, or <i>size</i> is
	* less than <code>0</code>
	*/
	public void setColumnDisplaySize(int columnIndex, int size) throws SQLException {
	if (size < 0) {
	throw new SQLException("Invalid column display size. Cannot be less " +
	"than zero");
	}
	checkColRange(columnIndex);
	colInfo[columnIndex].columnDisplaySize = size;
	}

	/**
	* Sets the suggested column label for use in printouts and
	* displays, if any, to <i>label</i>. If <i>label</i> is
	* <code>null</code>, the column label is set to an empty string
	* ("").
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @param label the column label to be used in printouts and displays; if the
	* column label is <code>null</code>, an empty <code>String</code> is
	* set
	* @throws SQLException if a database access error occurs
	* or the given column index is out of bounds
	*/
	public void setColumnLabel(int columnIndex, String label) throws SQLException {
	checkColRange(columnIndex);
	if (label != null) {
	colInfo[columnIndex].columnLabel = label;
	} else {
	colInfo[columnIndex].columnLabel = "";
	}
	}

	/**
	* Sets the column name of the designated column to the given name.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @param columnName a <code>String</code> object indicating the column name;
	* if the given name is <code>null</code>, an empty <code>String</code>
	* is set
	* @throws SQLException if a database access error occurs or the given column
	* index is out of bounds
	*/
	public void setColumnName(int columnIndex, String columnName) throws SQLException {
	checkColRange(columnIndex);
	if (columnName != null) {
	colInfo[columnIndex].columnName = columnName;
	} else {
	colInfo[columnIndex].columnName = "";
	}
	}

	/**
	* Sets the designated column's table's schema name, if any, to
	* <i>schemaName</i>. If <i>schemaName</i> is <code>null</code>,
	* the schema name is set to an empty string ("").
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @param schemaName the schema name for the table from which a value in the
	* designated column was derived; may be an empty <code>String</code>
	* or <code>null</code>
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public void setSchemaName(int columnIndex, String schemaName) throws SQLException {
	checkColRange(columnIndex);
	if (schemaName != null ) {
	colInfo[columnIndex].schemaName = schemaName;
	} else {
	colInfo[columnIndex].schemaName = "";
	}
	}

	/**
	* Sets the total number of decimal digits in a value stored in the
	* designated column to the given number.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @param precision the total number of decimal digits; must be <code>0</code>
	* or more
	* @throws SQLException if a database access error occurs,
	* <i>columnIndex</i> is out of bounds, or <i>precision</i>
	* is less than <code>0</code>
	*/
	public void setPrecision(int columnIndex, int precision) throws SQLException {

	if (precision < 0) {
	throw new SQLException("Invalid precision value. Cannot be less " +
	"than zero");
	}
	checkColRange(columnIndex);
	colInfo[columnIndex].colPrecision = precision;
	}

	/**
	* Sets the number of digits to the right of the decimal point in a value
	* stored in the designated column to the given number.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @param scale the number of digits to the right of the decimal point; must be
	* zero or greater
	* @throws SQLException if a database access error occurs,
	* <i>columnIndex</i> is out of bounds, or <i>scale</i>
	* is less than <code>0</code>
	*/
	public void setScale(int columnIndex, int scale) throws SQLException {
	if (scale < 0) {
	throw new SQLException("Invalid scale size. Cannot be less " +
	"than zero");
	}
	checkColRange(columnIndex);
	colInfo[columnIndex].colScale = scale;
	}

	/**
	* Sets the name of the table from which the designated column
	* was derived to the given table name.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @param tableName the column's table name; may be <code>null</code> or an
	* empty string
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public void setTableName(int columnIndex, String tableName) throws SQLException {
	checkColRange(columnIndex);
	if (tableName != null) {
	colInfo[columnIndex].tableName = tableName;
	} else {
	colInfo[columnIndex].tableName = "";
	}
	}

	/**
	* Sets the catalog name of the table from which the designated
	* column was derived to <i>catalogName</i>. If <i>catalogName</i>
	* is <code>null</code>, the catalog name is set to an empty string.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @param catalogName the column's table's catalog name; if the catalogName
	* is <code>null</code>, an empty <code>String</code> is set
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public void setCatalogName(int columnIndex, String catalogName) throws SQLException {
	checkColRange(columnIndex);
	if (catalogName != null)
	colInfo[columnIndex].catName = catalogName;
	else
	colInfo[columnIndex].catName = "";
	}

	/**
	* Sets the SQL type code for values stored in the designated column
	* to the given type code from the class <code>java.sql.Types</code>.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @param SQLType the designated column's SQL type, which must be one of the
	* constants in the class <code>java.sql.Types</code>
	* @throws SQLException if a database access error occurs,
	* the given column number is out of bounds, or the column type
	* specified is not one of the constants in
	* <code>java.sql.Types</code>
	* @see java.sql.Types
	*/
	public void setColumnType(int columnIndex, int SQLType) throws SQLException {
	// examine java.sql.Type reflectively, loop on the fields and check
	// this. Separate out into a private method
	checkColType(SQLType);
	checkColRange(columnIndex);
	colInfo[columnIndex].colType = SQLType;
	}

	/**
	* Sets the type name used by the data source for values stored in the
	* designated column to the given type name.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @param typeName the data source-specific type name; if <i>typeName</i> is
	* <code>null</code>, an empty <code>String</code> is set
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public void setColumnTypeName(int columnIndex, String typeName)
	throws SQLException {
	checkColRange(columnIndex);
	if (typeName != null) {
	colInfo[columnIndex].colTypeName = typeName;
	} else {
	colInfo[columnIndex].colTypeName = "";
	}
	}

	/**
	* Retrieves the number of columns in the <code>RowSet</code> object
	* for which this <code>RowSetMetaDataImpl</code> object was created.
	*
	* @return the number of columns
	* @throws SQLException if an error occurs determining the column count
	*/
	public int getColumnCount() throws SQLException {
	return colCount;
	}

	/**
	* Retrieves whether a value stored in the designated column is
	* automatically numbered, and thus readonly.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return <code>true</code> if the column is automatically numbered;
	* <code>false</code> otherwise
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public boolean isAutoIncrement(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].autoIncrement;
	}

	/**
	* Indicates whether the case of the designated column's name
	* matters.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return <code>true</code> if the column name is case sensitive;
	* <code>false</code> otherwise
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public boolean isCaseSensitive(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].caseSensitive;
	}

	/**
	* Indicates whether a value stored in the designated column
	* can be used in a <code>WHERE</code> clause.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return <code>true</code> if a value in the designated column can be used in a
	* <code>WHERE</code> clause; <code>false</code> otherwise
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public boolean isSearchable(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].searchable;
	}

	/**
	* Indicates whether a value stored in the designated column
	* is a cash value.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return <code>true</code> if a value in the designated column is a cash value;
	* <code>false</code> otherwise
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public boolean isCurrency(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].currency;
	}

	/**
	* Retrieves a constant indicating whether it is possible
	* to store a <code>NULL</code> value in the designated column.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return a constant from the <code>ResultSetMetaData</code> interface;
	* either <code>columnNoNulls</code>,
	* <code>columnNullable</code>, or
	* <code>columnNullableUnknown</code>
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public int isNullable(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].nullable;
	}

	/**
	* Indicates whether a value stored in the designated column is
	* a signed number.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return <code>true</code> if a value in the designated column is a signed
	* number; <code>false</code> otherwise
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public boolean isSigned(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].signed;
	}

	/**
	* Retrieves the normal maximum width in chars of the designated column.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return the maximum number of chars that can be displayed in the designated
	* column
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public int getColumnDisplaySize(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].columnDisplaySize;
	}

	/**
	* Retrieves the suggested column title for the designated
	* column for use in printouts and displays.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return the suggested column name to use in printouts and displays
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public String getColumnLabel(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].columnLabel;
	}

	/**
	* Retrieves the name of the designated column.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return the column name of the designated column
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public String getColumnName(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].columnName;
	}

	/**
	* Retrieves the schema name of the table from which the value
	* in the designated column was derived.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns,
	* inclusive
	* @return the schema name or an empty <code>String</code> if no schema
	* name is available
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public String getSchemaName(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	String str ="";
	if(colInfo[columnIndex].schemaName == null){
	} else {
	str = colInfo[columnIndex].schemaName;
	}
	return str;
	}

	/**
	* Retrieves the total number of digits for values stored in
	* the designated column.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return the precision for values stored in the designated column
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public int getPrecision(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].colPrecision;
	}

	/**
	* Retrieves the number of digits to the right of the decimal point
	* for values stored in the designated column.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return the scale for values stored in the designated column
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public int getScale(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].colScale;
	}

	/**
	* Retrieves the name of the table from which the value
	* in the designated column was derived.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return the table name or an empty <code>String</code> if no table name
	* is available
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public String getTableName(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].tableName;
	}

	/**
	* Retrieves the catalog name of the table from which the value
	* in the designated column was derived.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return the catalog name of the column's table or an empty
	* <code>String</code> if no catalog name is available
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public String getCatalogName(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	String str ="";
	if(colInfo[columnIndex].catName == null){
	} else {
	str = colInfo[columnIndex].catName;
	}
	return str;
	}

	/**
	* Retrieves the type code (one of the <code>java.sql.Types</code>
	* constants) for the SQL type of the value stored in the
	* designated column.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return an <code>int</code> representing the SQL type of values
	* stored in the designated column
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	* @see java.sql.Types
	*/
	public int getColumnType(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].colType;
	}

	/**
	* Retrieves the DBMS-specific type name for values stored in the
	* designated column.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return the type name used by the data source
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public String getColumnTypeName(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].colTypeName;
	}


	/**
	* Indicates whether the designated column is definitely
	* not writable, thus readonly.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return <code>true</code> if this <code>RowSet</code> object is read-Only
	* and thus not updatable; <code>false</code> otherwise
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public boolean isReadOnly(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].readOnly;
	}

	/**
	* Indicates whether it is possible for a write operation on
	* the designated column to succeed. A return value of
	* <code>true</code> means that a write operation may or may
	* not succeed.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return <code>true</code> if a write operation on the designated column may
	* will succeed; <code>false</code> otherwise
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public boolean isWritable(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return colInfo[columnIndex].writable;
	}

	/**
	* Indicates whether a write operation on the designated column
	* will definitely succeed.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return <code>true</code> if a write operation on the designated column will
	* definitely succeed; <code>false</code> otherwise
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public boolean isDefinitelyWritable(int columnIndex) throws SQLException {
	checkColRange(columnIndex);
	return true;
	}

	/**
	* Retrieves the fully-qualified name of the class in the Java
	* programming language to which a value in the designated column
	* will be mapped. For example, if the value is an <code>int</code>,
	* the class name returned by this method will be
	* <code>java.lang.Integer</code>.
	* <P>
	* If the value in the designated column has a custom mapping,
	* this method returns the name of the class that implements
	* <code>SQLData</code>. When the method <code>ResultSet.getObject</code>
	* is called to retrieve a value from the designated column, it will
	* create an instance of this class or one of its subclasses.
	*
	* @param columnIndex the first column is 1, the second is 2, and so on;
	* must be between <code>1</code> and the number of columns, inclusive
	* @return the fully-qualified name of the class in the Java programming
	* language that would be used by the method <code>RowSet.getObject</code> to
	* retrieve the value in the specified column. This is the class
	* name used for custom mapping when there is a custom mapping.
	* @throws SQLException if a database access error occurs
	* or the given column number is out of bounds
	*/
	public String getColumnClassName(int columnIndex) throws SQLException {
	String className = String.class.getName();

	int sqlType = getColumnType(columnIndex);

	switch (sqlType) {

	case Types.NUMERIC:
	case Types.DECIMAL:
	className = java.math.BigDecimal.class.getName();
	break;

	case Types.BIT:
	className = java.lang.Boolean.class.getName();
	break;

	case Types.TINYINT:
	className = java.lang.Byte.class.getName();
	break;

	case Types.SMALLINT:
	className = java.lang.Short.class.getName();
	break;

	case Types.INTEGER:
	className = java.lang.Integer.class.getName();
	break;

	case Types.BIGINT:
	className = java.lang.Long.class.getName();
	break;

	case Types.REAL:
	className = java.lang.Float.class.getName();
	break;

	case Types.FLOAT:
	case Types.DOUBLE:
	className = java.lang.Double.class.getName();
	break;

	case Types.BINARY:
	case Types.VARBINARY:
	case Types.LONGVARBINARY:
	className = "byte[]";
	break;

	case Types.DATE:
	className = java.sql.Date.class.getName();
	break;

	case Types.TIME:
	className = java.sql.Time.class.getName();
	break;

	case Types.TIMESTAMP:
	className = java.sql.Timestamp.class.getName();
	break;

	case Types.BLOB:
	className = java.sql.Blob.class.getName();
	break;

	case Types.CLOB:
	className = java.sql.Clob.class.getName();
	break;
	}

	return className;
	}

	/**
	* Returns an object that implements the given interface to allow access to non-standard methods,
	* or standard methods not exposed by the proxy.
	* The result may be either the object found to implement the interface or a proxy for that object.
	* If the receiver implements the interface then that is the object. If the receiver is a wrapper
	* and the wrapped object implements the interface then that is the object. Otherwise the object is
	* the result of calling <code>unwrap</code> recursively on the wrapped object. If the receiver is not a
	* wrapper and does not implement the interface, then an <code>SQLException</code> is thrown.
	*
	* @param iface A Class defining an interface that the result must implement.
	* @return an object that implements the interface. May be a proxy for the actual implementing object.
	* @throws java.sql.SQLException If no object found that implements the interface
	* @since 1.6
	*/
	public <T> T unwrap(java.lang.Class<T> iface) throws java.sql.SQLException {

	if(isWrapperFor(iface)) {
	return iface.cast(this);
	} else {
	throw new SQLException("unwrap failed for:"+ iface);
	}
	}

	/**
	* Returns true if this either implements the interface argument or is directly or indirectly a wrapper
	* for an object that does. Returns false otherwise. If this implements the interface then return true,
	* else if this is a wrapper then return the result of recursively calling <code>isWrapperFor</code> on the wrapped
	* object. If this does not implement the interface and is not a wrapper, return false.
	* This method should be implemented as a low-cost operation compared to <code>unwrap</code> so that
	* callers can use this method to avoid expensive <code>unwrap</code> calls that may fail. If this method
	* returns true then calling <code>unwrap</code> with the same argument should succeed.
	*
	* @param interfaces a Class defining an interface.
	* @return true if this implements the interface or directly or indirectly wraps an object that does.
	* @throws java.sql.SQLException if an error occurs while determining whether this is a wrapper
	* for an object with the given interface.
	* @since 1.6
	*/
	public boolean isWrapperFor(Class<?> interfaces) throws SQLException {
	return interfaces.isInstance(this);
	}

	static final long serialVersionUID = 6893806403181801867L;

	private class ColInfo implements Serializable {
	/**
	* The field that indicates whether the value in this column is a number
	* that is incremented automatically, which makes the value read-only.
	* <code>true</code> means that the value in this column
	* is automatically numbered; <code>false</code> means that it is not.
	*
	* @serial
	*/
	public boolean autoIncrement;

	/**
	* The field that indicates whether the value in this column is case sensitive.
	* <code>true</code> means that it is; <code>false</code> that it is not.
	*
	* @serial
	*/
	public boolean caseSensitive;

	/**
	* The field that indicates whether the value in this column is a cash value
	* <code>true</code> means that it is; <code>false</code> that it is not.
	*
	* @serial
	*/
	public boolean currency;

	/**
	* The field that indicates whether the value in this column is nullable.
	* The possible values are the <code>ResultSet</code> constants
	* <code>columnNoNulls</code>, <code>columnNullable</code>, and
	* <code>columnNullableUnknown</code>.
	*
	* @serial
	*/
	public int nullable;

	/**
	* The field that indicates whether the value in this column is a signed number.
	* <code>true</code> means that it is; <code>false</code> that it is not.
	*
	* @serial
	*/
	public boolean signed;

	/**
	* The field that indicates whether the value in this column can be used in
	* a <code>WHERE</code> clause.
	* <code>true</code> means that it can; <code>false</code> that it cannot.
	*
	* @serial
	*/
	public boolean searchable;

	/**
	* The field that indicates the normal maximum width in characters for
	* this column.
	*
	* @serial
	*/
	public int columnDisplaySize;

	/**
	* The field that holds the suggested column title for this column, to be
	* used in printing and displays.
	*
	* @serial
	*/
	public String columnLabel;

	/**
	* The field that holds the name of this column.
	*
	* @serial
	*/
	public String columnName;

	/**
	* The field that holds the schema name for the table from which this column
	* was derived.
	*
	* @serial
	*/
	public String schemaName;

	/**
	* The field that holds the precision of the value in this column. For number
	* types, the precision is the total number of decimal digits; for character types,
	* it is the maximum number of characters; for binary types, it is the maximum
	* length in bytes.
	*
	* @serial
	*/
	public int colPrecision;

	/**
	* The field that holds the scale (number of digits to the right of the decimal
	* point) of the value in this column.
	*
	* @serial
	*/
	public int colScale;

	/**
	* The field that holds the name of the table from which this column
	* was derived. This value may be the empty string if there is no
	* table name, such as when this column is produced by a join.
	*
	* @serial
	*/
	public String tableName ="";

	/**
	* The field that holds the catalog name for the table from which this column
	* was derived. If the DBMS does not support catalogs, the value may be the
	* empty string.
	*
	* @serial
	*/
	public String catName;

	/**
	* The field that holds the type code from the class <code>java.sql.Types</code>
	* indicating the type of the value in this column.
	*
	* @serial
	*/
	public int colType;

	/**
	* The field that holds the type name used by this particular data source
	* for the value stored in this column.
	*
	* @serial
	*/
	public String colTypeName;

	/**
	* The field that holds the updatability boolean per column of a RowSet
	*
	* @serial
	*/
	public boolean readOnly = false;

	/**
	* The field that hold the writable boolean per column of a RowSet
	*
	*@serial
	*/
	public boolean writable = true;

	static final long serialVersionUID = 5490834817919311283L;
	}
	}

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