org.firebirdsql.jdbc.FBResultSetMetaData Maven / Gradle / Ivy
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/*
* $Id: FBResultSetMetaData.java 57129 2012-09-09 09:28:02Z mrotteveel $
*
* Firebird Open Source J2ee connector - jdbc driver
*
* Distributable under LGPL license.
* You may obtain a copy of the License at http://www.gnu.org/copyleft/lgpl.html
*
* This program 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
* LGPL License for more details.
*
* This file was created by members of the firebird development team.
* All individual contributions remain the Copyright (C) of those
* individuals. Contributors to this file are either listed here or
* can be obtained from a CVS history command.
*
* All rights reserved.
*/
package org.firebirdsql.jdbc;
import java.math.BigDecimal;
import java.sql.*;
import java.sql.Date;
import java.util.*;
import org.firebirdsql.encodings.EncodingFactory;
import org.firebirdsql.gds.ISCConstants;
import org.firebirdsql.gds.XSQLVAR;
import org.firebirdsql.gds.impl.GDSHelper;
/**
* Implementation of {@link java.sql.ResultSetMetaData} interface.
*
* @author David Jencks
* @author Mark Rotteveel
*/
public class FBResultSetMetaData implements FirebirdResultSetMetaData {
private final XSQLVAR[] xsqlvars;
private Map extendedInfo;
private final GDSHelper connection;
private final ColumnStrategy columnStrategy;
/**
* Creates a new FBResultSetMetaData instance.
*
* @param xsqlvars a XSQLVAR[] value
* @param connection a AbstractConnection value
* @exception SQLException if an error occurs
*
* TODO Need another constructor for metadata from constructed
* result set, where we supply the ext field info.
*/
protected FBResultSetMetaData(XSQLVAR[] xsqlvars, GDSHelper connection) throws SQLException {
this.xsqlvars = xsqlvars;
this.connection = connection;
// Decide how to handle column names and column labels
if (connection != null && connection.getDatabaseParameterBuffer().hasArgument(ISCConstants.isc_dpb_column_label_for_name)) {
columnStrategy = ColumnStrategy.COLUMN_LABEL_FOR_NAME;
} else {
columnStrategy = ColumnStrategy.DEFAULT;
}
}
private String getIscEncoding() {
if (connection != null)
return connection.getIscEncoding();
else
return "NONE";
}
/**
* Returns the number of columns in this ResultSet object.
*
* @return the number of columns
*/
public int getColumnCount() {
return xsqlvars.length;
}
/**
* Indicates whether the designated column is automatically numbered, thus read-only.
*
* @param column the first column is 1, the second is 2, ...
* @return true if so; false otherwise
*/
public boolean isAutoIncrement(int column) {
return false;
}
/**
* Indicates whether a column's case matters.
*
* @param column the first column is 1, the second is 2, ...
* @return true if so; false otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isCaseSensitive(int column) throws SQLException {
return true;
}
/**
* Indicates whether the designated column can be used in a where clause.
*
* @param column the first column is 1, the second is 2, ...
* @return true if so; false otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isSearchable(int column) throws SQLException {
if (((getXsqlvar(column).sqltype & ~1) == ISCConstants.SQL_ARRAY)
|| ((getXsqlvar(column).sqltype & ~1) == ISCConstants.SQL_BLOB)) {
return false;
}
else {
return true;
}
}
/**
* Indicates whether the designated column is a cash value.
*
* @param column the first column is 1, the second is 2, ...
* @return true if so; false otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isCurrency(int column) throws SQLException {
return false;
}
/**
* Indicates the nullability of values in the designated column.
*
* @param column the first column is 1, the second is 2, ...
* @return the nullability status of the given column; one of columnNoNulls,
* columnNullable or columnNullableUnknown
* @exception SQLException if a database access error occurs
*/
public int isNullable(int column) throws SQLException {
if ((getXsqlvar(column).sqltype & 1) == 1) {
return columnNullable;
}
else {
return columnNoNulls;
}
}
/**
* The constant indicating that a
* column does not allow NULL values.
*/
int columnNoNulls = 0;
/**
* The constant indicating that a
* column allows NULL values.
*/
int columnNullable = 1;
/**
* The constant indicating that the
* nullability of a column's values is unknown.
*/
int columnNullableUnknown = 2;
/**
* Indicates whether values in the designated column are signed numbers.
*
* @param column the first column is 1, the second is 2, ...
* @return true if so; false otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isSigned(int column) throws SQLException {
switch (getXsqlvar(column).sqltype & ~1) {
case ISCConstants.SQL_SHORT:
case ISCConstants.SQL_LONG:
case ISCConstants.SQL_FLOAT:
case ISCConstants.SQL_DOUBLE:
case ISCConstants.SQL_D_FLOAT:
case ISCConstants.SQL_INT64:
return true;
default:
return false;
}
}
/**
* Indicates the designated column's normal maximum width in characters.
*
* @param column the first column is 1, the second is 2, ...
* @return the normal maximum number of characters allowed as the width
* of the designated column
* @exception SQLException if a database access error occurs
*/
public int getColumnDisplaySize(int column) throws SQLException {
int colType = getColumnType(column);
switch (colType){
case Types.DECIMAL:
case Types.NUMERIC: {
ExtendedFieldInfo fieldInfo = getExtFieldInfo(column);
if (fieldInfo == null)
return estimatePrecision(column);
else
return fieldInfo.fieldPrecision;
}
case Types.CHAR:
case Types.VARCHAR: {
XSQLVAR var = getXsqlvar(column);
int charset = var.sqlsubtype & 0xFF;
int charSetSize = charset == 127 /* CS_dynamic */ ?
EncodingFactory.getIscEncodingSize(getIscEncoding()) :
EncodingFactory.getCharacterSetSize(charset);
return var.sqllen / charSetSize;
}
case Types.FLOAT:
return 9;
case Types.DOUBLE:
return 17;
case Types.INTEGER:
return 11;
case Types.BIGINT:
return 21;
case Types.SMALLINT:
return 6;
case Types.DATE:
return 10;
case Types.TIME:
return 8;
case Types.TIMESTAMP:
return 19;
default:
return 0;
}
}
/**
* Gets the designated column's suggested title for use in printouts and
* displays.
*
* @param column the first column is 1, the second is 2, ...
* @return the suggested column title
* @exception SQLException if a database access error occurs
*/
public String getColumnLabel(int column) throws SQLException {
return columnStrategy.getColumnLabel(getXsqlvar(column));
}
/**
* Get the designated column's name.
*
* @param column the first column is 1, the second is 2, ...
* @return column name
* @exception SQLException if a database access error occurs
*/
public String getColumnName(int column) throws SQLException {
return columnStrategy.getColumnName(getXsqlvar(column));
}
public String getSourceColumnName(int column) throws SQLException {
String result = getXsqlvar(column).sqlname;
if (result == null)
result = "";
return result;
}
/**
* Get the designated column's table's schema.
*
* @param column the first column is 1, the second is 2, ...
* @return schema name or "" if not applicable
* @exception SQLException if a database access error occurs
*/
public String getSchemaName(int column) throws SQLException {
//not really implemented
return "";
}
/**
* Get the designated column's number of decimal digits.
*
* @param column the first column is 1, the second is 2, ...
* @return precision
* @exception SQLException if a database access error occurs
*/
public int getPrecision(int column) throws SQLException {
int colType = getColumnType(column);
switch (colType){
case Types.DECIMAL:
case Types.NUMERIC: {
ExtendedFieldInfo fieldInfo = getExtFieldInfo(column);
if (fieldInfo == null)
return estimatePrecision(column);
else
return fieldInfo.fieldPrecision;
}
case Types.CHAR:
case Types.VARCHAR: {
XSQLVAR var = getXsqlvar(column);
int charset = var.sqlsubtype & 0xFF;
int charSetSize = charset == 127 /* CS_dynamic */ ?
EncodingFactory.getIscEncodingSize(getIscEncoding()) :
EncodingFactory.getCharacterSetSize(charset);
return var.sqllen / charSetSize;
}
case Types.FLOAT:
return 7;
case Types.DOUBLE:
return 15;
case Types.INTEGER:
return 10;
case Types.BIGINT:
return 20;
case Types.SMALLINT:
return 5;
case Types.DATE:
return 10;
case Types.TIME:
return 8;
case Types.TIMESTAMP:
return 19;
default:
return 0;
}
}
/**
* Gets the designated column's number of digits to right of the decimal point.
*
* @param column the first column is 1, the second is 2, ...
* @return scale
* @exception SQLException if a database access error occurs
*/
public int getScale(int column) throws SQLException {
return getXsqlvar(column).sqlscale * (-1);
}
/**
* Gets the designated column's table name.
*
* @param column the first column is 1, the second is 2, ...
* @return table name or "" if not applicable
* @exception SQLException if a database access error occurs
*/
public String getTableName(int column) throws SQLException {
String result = getXsqlvar(column).relname;
if (result == null) result = "";
return result;
}
/**
* Gets the designated column's table alias.
*
* @param column the first column is 1, the second is 2, ...
* @return table alias or "" if not applicable
* @exception SQLException if a database access error occurs
*/
public String getTableAlias(int column) throws SQLException {
String result = getXsqlvar(column).relaliasname;
if (result == null) result = getTableName(column);
return result;
}
/**
* Gets the designated column's table's catalog name.
*
* @param column the first column is 1, the second is 2, ...
* @return column name or "" if not applicable
* @exception SQLException if a database access error occurs
*/
public String getCatalogName(int column) throws SQLException {
return "";
}
/**
* Retrieves the designated column's SQL type.
*
* @param column the first column is 1, the second is 2, ...
* @return SQL type from java.sql.Types
* @exception SQLException if a database access error occurs
* @see Types
*/
public int getColumnType(int column) throws SQLException {
int sqltype = getXsqlvar(column).sqltype & ~1;
int sqlscale = getXsqlvar(column).sqlscale;
int sqlsubtype = getXsqlvar(column).sqlsubtype;
if (sqlscale < 0) {
switch (sqltype) {
case ISCConstants.SQL_SHORT:
case ISCConstants.SQL_LONG:
case ISCConstants.SQL_INT64:
case ISCConstants.SQL_DOUBLE:
// NOTE: can't be BIGINT because of scale
if (sqlsubtype == 2)
return Types.DECIMAL;
else
return Types.NUMERIC;
default:
break;
}
}
switch (sqltype) {
case ISCConstants.SQL_SHORT:
return Types.SMALLINT;
case ISCConstants.SQL_LONG:
return Types.INTEGER;
case ISCConstants.SQL_DOUBLE:
case ISCConstants.SQL_D_FLOAT:
return Types.DOUBLE;
case ISCConstants.SQL_FLOAT:
return Types.FLOAT;
case ISCConstants.SQL_TEXT:
return Types.CHAR;
case ISCConstants.SQL_VARYING:
return Types.VARCHAR;
case ISCConstants.SQL_TIMESTAMP:
return Types.TIMESTAMP;
case ISCConstants.SQL_TYPE_TIME:
return Types.TIME;
case ISCConstants.SQL_TYPE_DATE:
return Types.DATE;
case ISCConstants.SQL_INT64:
if (sqlsubtype == 1)
return Types.NUMERIC;
else if (sqlsubtype == 2)
return Types.DECIMAL;
else
return Types.BIGINT;
case ISCConstants.SQL_BLOB:
if (sqlsubtype < 0)
return Types.BLOB;
else if (sqlsubtype == 0 || sqlsubtype > 1)
return Types.LONGVARBINARY;
else if (sqlsubtype == 1)
return Types.LONGVARCHAR;
else
return Types.OTHER;
case ISCConstants.SQL_QUAD:
return Types.OTHER;
default:
return Types.NULL;
}
}
/**
* Retrieves the designated column's database-specific type name.
*
* @param column the first column is 1, the second is 2, ...
* @return type name used by the database. If the column type is
* a user-defined type, then a fully-qualified type name is returned.
* @exception SQLException if a database access error occurs
*/
public String getColumnTypeName(int column) throws SQLException {
// Must return the same value as DatabaseMetaData getColumns Type_Name
int sqltype = getXsqlvar(column).sqltype & ~1;
int sqlscale = getXsqlvar(column).sqlscale;
int sqlsubtype = getXsqlvar(column).sqlsubtype;
if (sqlscale < 0) {
switch (sqltype) {
case ISCConstants.SQL_SHORT:
case ISCConstants.SQL_LONG:
case ISCConstants.SQL_INT64:
case ISCConstants.SQL_DOUBLE:
// NOTE: can't be BIGINT because of scale
if (sqlsubtype == 2)
return "DECIMAL";
else
return "NUMERIC";
default:
break;
}
}
switch (sqltype) {
case ISCConstants.SQL_SHORT:
return "SMALLINT";
case ISCConstants.SQL_LONG:
return "INTEGER";
case ISCConstants.SQL_DOUBLE:
case ISCConstants.SQL_D_FLOAT:
return "DOUBLE PRECISION";
case ISCConstants.SQL_FLOAT:
return "FLOAT";
case ISCConstants.SQL_TEXT:
return "CHAR";
case ISCConstants.SQL_VARYING:
return "VARCHAR";
case ISCConstants.SQL_TIMESTAMP:
return "TIMESTAMP";
case ISCConstants.SQL_TYPE_TIME:
return "TIME";
case ISCConstants.SQL_TYPE_DATE:
return "DATE";
case ISCConstants.SQL_INT64:
//this might need some help for long mapping
if (sqlsubtype == 1)
return "NUMERIC";
else if (sqlsubtype == 2)
return "DECIMAL";
else
return "BIGINT";
case ISCConstants.SQL_BLOB:
if (sqlsubtype < 0)
return "BLOB SUB_TYPE <0";
else if (sqlsubtype == 0)
return "BLOB SUB_TYPE 0";
else if (sqlsubtype == 1)
return "BLOB SUB_TYPE 1";
else
return "BLOB SUB_TYPE " + sqlsubtype;
case ISCConstants.SQL_QUAD:
return "ARRAY";
default:
return "NULL";
}
}
/**
* Indicates whether the designated column is definitely not writable.
*
* @param column the first column is 1, the second is 2, ...
* @return true if so; false otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isReadOnly(int column) throws SQLException {
//Need to consider priveleges!!
return false;
}
/**
* Indicates whether it is possible for a write on the designated column to succeed.
*
* @param column the first column is 1, the second is 2, ...
* @return true if so; false otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isWritable(int column) throws SQLException {
//Needs priveleges???
return true;
}
/**
* Indicates whether a write on the designated column will definitely succeed.
*
* @param column the first column is 1, the second is 2, ...
* @return true if so; false otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isDefinitelyWritable(int column) throws SQLException {
//Need to consider privileges!!!
return true;
}
//--------------------------JDBC 2.0-----------------------------------
/**
* Returns the fully-qualified name of the Java class whose instances
* are manufactured if the method ResultSet.getObject
* is called to retrieve a value
* from the column. ResultSet.getObject may return a subclass of the
* class returned by this method.
*
* @return the fully-qualified name of the class in the Java programming
* language that would be used by the method
* ResultSet.getObject to retrieve the value in the specified
* column. This is the class name used for custom mapping.
* @exception SQLException if a database access error occurs
* @since 1.2
* @see What Is in the JDBC
* 2.0 API
*/
public String getColumnClassName(int column) throws SQLException {
switch (getXsqlvar(column).sqltype & ~1) {
case ISCConstants.SQL_TEXT:
case ISCConstants.SQL_VARYING:
return String.class.getName();
case ISCConstants.SQL_SHORT:
case ISCConstants.SQL_LONG:
return Integer.class.getName();
case ISCConstants.SQL_FLOAT:
case ISCConstants.SQL_DOUBLE:
case ISCConstants.SQL_D_FLOAT:
return Double.class.getName();
case ISCConstants.SQL_TIMESTAMP:
return Timestamp.class.getName();
case ISCConstants.SQL_BLOB:
XSQLVAR field = getXsqlvar(column);
if (field.sqlsubtype < 0)
return Blob.class.getName();
if (field.sqlsubtype == 1)
return String.class.getName();
else
return byte[].class.getName();
case ISCConstants.SQL_ARRAY:
return Array.class.getName();
case ISCConstants.SQL_QUAD:
return Long.class.getName();
case ISCConstants.SQL_TYPE_TIME:
return Time.class.getName();
case ISCConstants.SQL_TYPE_DATE:
return Date.class.getName();
case ISCConstants.SQL_INT64:
if (getXsqlvar(column).sqlscale == 0) {
return Long.class.getName();
}
else {
return BigDecimal.class.getName();
}
default:
throw new FBSQLException("Unkown SQL type.",
FBSQLException.SQL_STATE_INVALID_PARAM_TYPE);
}
}
//private methods
private XSQLVAR getXsqlvar(int columnIndex) {
//return stmt.getOutSqlda().sqlvar[columnIndex - 1];
return xsqlvars[columnIndex - 1];
}
private ExtendedFieldInfo getExtFieldInfo(int columnIndex)
throws SQLException
{
if (extendedInfo == null)
{
this.extendedInfo = getExtendedFieldInfo(connection);
} // end of if ()
FieldKey key = new FieldKey(
getXsqlvar(columnIndex).relname,
getXsqlvar(columnIndex).sqlname);
return (ExtendedFieldInfo)extendedInfo.get(key);
}
private int estimatePrecision(int columnIndex) {
int sqltype = getXsqlvar(columnIndex).sqltype & ~1;
// TODO: Why unused?
int sqlscale = getXsqlvar(columnIndex).sqlscale;
switch(sqltype) {
case ISCConstants.SQL_SHORT : return 5;
case ISCConstants.SQL_LONG : return 10;
case ISCConstants.SQL_INT64 : return 19;
case ISCConstants.SQL_DOUBLE : return 19;
default : return 0;
}
}
private static final String GET_FIELD_INFO = "SELECT "
+ " RF.RDB$RELATION_NAME as RELATION_NAME"
+ ", RF.RDB$FIELD_NAME as FIELD_NAME"
+ ", F.RDB$FIELD_LENGTH as FIELD_LENGTH"
+ ", F.RDB$FIELD_PRECISION as FIELD_PRECISION"
+ ", F.RDB$FIELD_SCALE as FIELD_SCALE"
+ ", F.RDB$FIELD_SUB_TYPE as FIELD_SUB_TYPE"
+ ", F.RDB$CHARACTER_LENGTH as CHAR_LEN"
+ ", F.RDB$CHARACTER_SET_ID as CHARACTER_SET_ID"
+ " FROM"
+ " RDB$RELATION_FIELDS RF "
+ ", RDB$FIELDS F "
+ " WHERE "
+ " RF.RDB$FIELD_SOURCE = F.RDB$FIELD_NAME"
+ " AND"
+ " RF.RDB$FIELD_NAME = ?"
+ " AND"
+ " RF.RDB$RELATION_NAME = ?"
;
/**
* This class is an old-fashion data structure that stores additional
* information about fields in a database.
*/
private static class ExtendedFieldInfo {
// TODO Find out why there are unused fields here
String relationName;
String fieldName;
int fieldLength;
int fieldPrecision;
int fieldScale;
int fieldSubtype;
int characterLength;
int characterSetId;
}
/**
* This class should be used as a composite key in an internal field
* mapping structures.
*/
private static final class FieldKey {
private String relationName;
private String fieldName;
/**
* Create instance of this class for the specified relation and field
* names.
*
* @param relationName relation name.
* @param fieldName field name.
*/
FieldKey(String relationName, String fieldName) {
this.relationName = relationName;
this.fieldName = fieldName;
}
/**
* Check if obj is equal to this object.
*
* @param obj object to check.
*
* @return true if obj is instance of this
* class and has equal relation and field names.
*/
public boolean equals(Object obj) {
if (obj == this) return true;
if (obj == null || !(obj instanceof FieldKey)) return false;
FieldKey that = (FieldKey)obj;
return (relationName != null ? relationName.equals(that.relationName) : that.relationName == null)
&&
(fieldName != null ? fieldName.equals(that.fieldName) : that.fieldName == null);
}
/**
* Get hash code of this instance.
*
* @return combination of hash codes of relationName field
* and fieldName field.
*/
public int hashCode() {
int result = 971;
result = 23 * result + (relationName != null ? relationName.hashCode() : 0);
result = 23 * result + (fieldName != null ? fieldName.hashCode() : 0);
return result;
}
}
/**
* This method retrieves extended information from the system tables in
* a database. Since this method is expensinve, use it with care.
*
* @return mapping between {@link FieldKey} instances and
* {@link ExtendedFieldInfo} instances.
*
* @throws SQLException if extended field information cannot be obtained.
*/
private Map getExtendedFieldInfo(GDSHelper gdsHelper) throws SQLException {
if (gdsHelper == null) return Collections.EMPTY_MAP;
//
// Apparently there is a limit in the UNION
// It is necesary to split in several querys
// Although the problem reported with 93 UNION use only 70
//
int pending = xsqlvars.length;
HashMap result = new HashMap();
while (pending > 0){
StringBuffer sb = new StringBuffer();
ArrayList params = new ArrayList();
int maxLength = (pending>70) ? 70 : pending;
for (int i = 0; i < maxLength; i++) {
String relationName = xsqlvars[i].relname;
String fieldName = xsqlvars[i].sqlname;
if (relationName == null || fieldName == null) continue;
sb.append(GET_FIELD_INFO);
params.add(fieldName);
params.add(relationName);
if (i < maxLength - 1)
sb.append("\n").append("UNION").append("\n");
}
FBDatabaseMetaData metaData = new FBDatabaseMetaData(gdsHelper);
ResultSet rs = metaData.doQuery(sb.toString(), params);
try {
while(rs.next()) {
ExtendedFieldInfo fieldInfo = new ExtendedFieldInfo();
fieldInfo.relationName = rs.getString("RELATION_NAME");
fieldInfo.fieldName = rs.getString("FIELD_NAME");
fieldInfo.fieldLength = rs.getInt("FIELD_LENGTH");
fieldInfo.fieldPrecision = rs.getInt("FIELD_PRECISION");
fieldInfo.fieldScale = rs.getInt("FIELD_SCALE");
fieldInfo.fieldSubtype = rs.getInt("FIELD_SUB_TYPE");
fieldInfo.characterSetId = rs.getInt("CHARACTER_SET_ID");
fieldInfo.characterLength = rs.getInt("CHAR_LEN");
if (rs.wasNull())
fieldInfo.characterLength =
fieldInfo.fieldLength /
EncodingFactory.getCharacterSetSize(fieldInfo.characterSetId);
result.put(
new FieldKey(fieldInfo.relationName, fieldInfo.fieldName),
fieldInfo);
}
} finally {
rs.close();
}
pending -= maxLength;
}
return result;
}
public boolean isWrapperFor(Class iface) throws SQLException {
return iface != null && iface.isAssignableFrom(getClass());
}
public T unwrap(Class iface) throws SQLException {
if (!isWrapperFor(iface))
throw new FBDriverNotCapableException();
return iface.cast(this);
}
/**
* Strategy for retrieving column labels and column names
*/
private enum ColumnStrategy {
/**
* Default, JDBC-compliant, strategy for column naming.
*
* columnLabel is the AS clause (xsqlvar.aliasname) if specified,
* otherwise xsqlvar.sqlname.
*
*
* columnName is xsqlvar.sqlname if specified, otherwise xsqlvar.aliasname (TODO: change this?)
*
*/
DEFAULT {
@Override
String getColumnName(XSQLVAR xsqlvar) {
if (xsqlvar.sqlname == null) {
return getColumnLabel(xsqlvar);
} else {
return xsqlvar.sqlname;
}
}
},
/**
* Alternative strategy for column naming (related to columnLabelForName connection property)
*
* This strategy is not JDBC-compliant, but is provided as a workaround for use with com.sun.rowset.CachedRowSetImpl and
* for people expecting the old behavior.
*
* columnLabel is the AS clause (xsqlvar.aliasname) if specified,
* otherwise xsqlvar.sqlname.
*
*
* columnName is identical to columnLabel.
*
*/
COLUMN_LABEL_FOR_NAME {
@Override
String getColumnName(XSQLVAR xsqlvar) {
return getColumnLabel(xsqlvar);
}
}
;
/**
* Retrieve the columnName for the specified column.
*
* @param xsqlvar Column XSQLVAR
* @return value for the columnName
*/
abstract String getColumnName(XSQLVAR xsqlvar);
/**
* Retrieve the columnLabel for the specified column.
*
* @param xsqlvar Column XSQLVAR
* @return value for the columnLabel
*/
String getColumnLabel(XSQLVAR xsqlvar) {
if (xsqlvar.aliasname != null) {
return xsqlvar.aliasname;
} else if (xsqlvar.sqlname != null) {
return xsqlvar.sqlname;
} else {
return "";
}
}
}
}