/* Copyright (c) 2001-2009, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb.jdbc;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import org.hsqldb.ColumnBase;
import org.hsqldb.ErrorCode;
import org.hsqldb.Types;
import org.hsqldb.persist.HsqlProperties;
import org.hsqldb.result.ResultMetaData;
import org.hsqldb.types.CharacterType;
import org.hsqldb.types.Type;
/* $Id: JDBCResultSetMetaData.java 2980 2009-05-02 14:38:05Z fredt $ */
// fredt@users - 20040412 - removed DITypeInfo dependencies
// boucherb@users - 200404xx - removed unused imports;refinement for better
// usability of getColumnDisplaySize;
// javadoc updates
// boucherb@users - 20051207 - patch 1.8.0.x initial JDBC 4.0 support work
// boucherb@users - 20060522 - doc 1.9.0 full synch up to Mustang Build 84
// fredt@users - 1.9.0 usage of types and new ResultMetadata and ColumnMetaData
// Revision 1.15 2006/07/12 12:29:42 boucherb
// patch 1.9.0
// - full synch up to Mustang b90
// - minor update to toString
/**
* <!-- start generic documentation -->
* An object that can be used to get information about the types
* and properties of the columns in a <code>ResultSet</code> object.
* The following code fragment creates the <code>ResultSet</code> object rs,
* creates the <code>ResultSetMetaData</code> object rsmd, and uses rsmd
* to find out how many columns rs has and whether the first column in rs
* can be used in a <code>WHERE</code> clause.
* <PRE>
*
* ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM TABLE2");
* ResultSetMetaData rsmd = rs.getMetaData();
* int numberOfColumns = rsmd.getColumnCount();
* boolean b = rsmd.isSearchable(1);
*
* </PRE>
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* HSQLDB supports a subset of the <code>ResultSetMetaData</code> interface.<p>
*
* The JDBC specification for <code>ResultSetMetaData</code> is in part very
* vague. This causes potential incompatibility between interpretations of the
* specification as realized in different JDBC driver implementations. As such,
* deciding to what degree reporting ResultSetMetaData is accurate has been
* considered very carefully. Hopefully, the design decisions made in light of
* these considerations have yeilded precisely the subset of full
* ResultSetMetaData support that is most commonly needed and that is most
* important, while also providing, under the most common use-cases, the
* fastest access with the least overhead and the best comprimise between
* speed, accuracy, jar-footprint and retention of JDBC resources. <p>
*
* (fredt@users) <br>
* (boucherb@users)<p>
* </div>
* <!-- end release-specific documentation -->
*
* @author Campbell Boucher-Burnett (boucherb@users dot sourceforge.net)
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 1.9.0
* @revised JDK 1.6, HSQLDB 1.8.x
* @see JDBCStatement#executeQuery
* @see JDBCStatement#getResultSet
* @see java.sql.ResultSetMetaData
*/
public class JDBCResultSetMetaData implements ResultSetMetaData {
/**
* <!-- start generic documentation -->
* Returns the number of columns in this <code>ResultSet</code> object.
*
* <!-- end generic documentation -->
* @return the number of columns
* @exception SQLException if a database access error occurs
*/
public int getColumnCount() throws SQLException {
return resultMetaData.getColumnCount();
}
/**
* <!-- start generic documentation -->
* Indicates whether the designated column is automatically numbered.
* <p>(JDBC4 deleted:)[, thus read-only.]
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* HSQLDB 1.9.0 fully supports SQL Satandard features T174 and T176 that
* define identity column support.
*
* <hr>
*
* However, it must be stated here that contrary to the generic
* documentation previous to the JDBC4 specification, HSQLDB automatically
* numbered columns (IDENTITY columns, in HSQLDB parlance) are not
* read-only. <p>
*
* In fact, the generic documentation previous to the JDBC4 specification
* seems to contradict the general definition of what, at minimum,
* an auto-increment column is: <p>
*
* Simply, an auto-increment column is one that guarantees it has a
* autogenerated value after a successful insert or update operation,
* even if no value is supplied, or DEFAULT is specified.<p>
*
* </div>
* <!-- end release-specific documentation -->
*
* @param column the first column is 1, the second is 2, ...
* @return <code>true</code> if so; <code>false</code> otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isAutoIncrement(int column) throws SQLException {
checkColumn(column);
return resultMetaData.columns[--column].isIdentity();
}
/**
* <!-- start generic documentation -->
* Indicates whether a column's case matters.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* HSQLDB 1.7.1 did not report this value accurately. <p>
*
* Starting with 1.7.2, this feature is better supported. <p>
*
* This method returns true for any column whose data type is a character
* type, with the exception of VARCHAR_IGNORECASE for which it returns
* false. It also returns false for any column whose data type is a
* not a character data type. <p>
*
* </div>
* <!-- end release-specific documentation -->
*
* @param column the first column is 1, the second is 2, ...
* @return <code>true</code> if so; <code>false</code> otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isCaseSensitive(int column) throws SQLException {
checkColumn(column);
Type type = resultMetaData.columnTypes[--column];
if (type.isCharacterType()) {
return !((CharacterType) type).isCaseInsensitive();
}
return false;
}
/**
* <!-- start generic documentation -->
* Indicates whether the designated column can be used in a where clause.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* HSQLDB 1.9.0 handles this differently from previous versions. <p>
*
* If the column in question is a database table or view column, and the
* type of the column allows searching, then returns true, otherwise false.
*
* </div>
* <!-- end release-specific documentation -->
*
* @param column the first column is 1, the second is 2, ...
* @return <code>true</code> if so; <code>false</code> otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isSearchable(int column) throws SQLException {
checkColumn(column);
return resultMetaData.columns[--column].isSearchable();
}
/**
* <!-- start generic documentation -->
* Indicates whether the designated column is a cash value.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* HSQLDB 1.9.0 fully supports this feature and returns true for
* NUMERIC and DECIMAL columns. <p>
*
* </div>
* <!-- end release-specific documentation -->
*
* @param column the first column is 1, the second is 2, ...
* @return <code>true</code> if so; <code>false</code> otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isCurrency(int column) throws SQLException {
checkColumn(column);
Type type = resultMetaData.columnTypes[--column];
return (type.typeCode == Types.SQL_DECIMAL
|| type.typeCode == Types.SQL_NUMERIC) && type.scale > 0;
}
/**
* <!-- start generic documentation -->
* Indicates the nullability of values in the designated column.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* HSQLDB 1.9.0 fully supports this feature. <p>
*
* <tt>columnNoNulls</tt> is always returned for result set columns
* that do not directly represent table column values (i.e. are calculated),
* while the corresponding value in [INFORMATION_SCHEMA.]SYSTEM_COLUMNS.NULLABLE
* is returned for result set columns that do directly represent table
* column values. <p>
*
* To determine the nullable status of a table column in isolation from
* ResultSetMetaData and in a DBMS-independent fashion, the
* DatabaseMetaData.getColumns() method can be invoked with the
* appropriate filter values and the result should be inspected at the
* position described in the DatabaseMetaData.getColumns() API
* documentation.
* </div>
* <!-- end release-specific documentation -->
*
* @param column the first column is 1, the second is 2, ...
* @return the nullability status of the given column; one of <code>columnNoNulls</code>,
* <code>columnNullable</code> or <code>columnNullableUnknown</code>
* @exception SQLException if a database access error occurs
*/
public int isNullable(int column) throws SQLException {
checkColumn(column);
return resultMetaData.columns[--column].getNullability();
}
/**
* <!-- start generic documentation -->
* Indicates whether values in the designated column are signed numbers.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* HSQLDB 1.9.0 fully supports this feature. <p>
*
* </div>
* <!-- end release-specific documentation -->
*
* @param column the first column is 1, the second is 2, ...
* @return <code>true</code> if so; <code>false</code> otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isSigned(int column) throws SQLException {
checkColumn(column);
Type type = resultMetaData.columnTypes[--column];
return type.isNumberType();
}
/**
* <!-- start generic documentation -->
* Indicates the designated column's normal maximum width in characters.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* HSQLDB 1.9.0 fully supports this feature. <p>
*
* The current calculation follows these rules: <p>
*
* <ol>
* <li>Long character types and datetime types:<p>
*
* The maximum length/precision, repectively.<p>
*
* <li>CHAR and VARCHAR types: <p>
*
* <ul>
* <li> If the result set column is a direct pass through of a table
* column value and column size was declared, then the declared
* value is returned. <p>
*
* <li> Otherwise, the computed length according to SQL Standard is
* returned. For very large values, the value of the system property
* hsqldb.max_xxxchar_display_size or the magic value
* 32766 (0x7FFE) (tested usable/accepted by most tools and
* compatible with assumptions made by java.io read/write
* UTF) when the system property is not defined or is not
* accessible, due to security constraints. <p>
*
* </ul>
*
* It must be noted that the latter value in no way affects the
* ability of the HSQLDB JDBC driver to retrieve longer values
* and serves only as the current best effort at providing a
* value that maximizes usability across a wide range of tools,
* given that the HSQLDB database engine allows very large
* lengths to be declared. <p>
*
* <li>Number types: <p>
*
* The max precision, plus the length of the negation character (1),
* plus (if applicable) the maximum number of characters that may
* occupy the exponent character sequence. Note that some legacy tools
* do not correctly handle BIGINT values of greater than 18 digits. <p>
*
* <li>BOOLEAN type: <p>
*
* The length of the character sequence "false" (5), the longer of the
* two boolean value String representations. <p>
*
* <li>Remaining types: <p>
*
* The maximum length/precision, respectively, as reported by
* DatabaseMetaData.getTypeInfo(), when applicable. If the maximum
* display size is unknown, unknowable or inapplicable, then zero is
* returned. <p>
*
* </ol>
*
* </div>
* <!-- end release-specific documentation -->
*
* @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 {
checkColumn(column);
Type type = resultMetaData.columnTypes[--column];
return type.displaySize();
}
/**
* <!-- start generic documentation -->
* Gets the designated column's suggested title for use in printouts and
* displays. (JDBC4 clarification:) The suggested title is usually specified by the SQL <code>AS</code>
* clause. If a SQL <code>AS</code> is not specified, the value returned from
* <code>getColumnLabel</code> will be the same as the value returned by the
* <code>getColumnName</code> method.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* In HSQLDB, a <code>ResultSet</code> column label is determined using the
* following order of precedence:<p>
*
* <OL>
* <LI>The label (alias) specified in the generating query.</LI>
* <LI>The name of the underlying column, if no label is specified.<br>
* <L1>C1, C2, etc. for computed columns that have no label.</LI>
* </OL> <p>
*
* </div>
* <!-- end release-specific documentation -->
*
* @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 {
checkColumn(column--);
String label = resultMetaData.columnLabels[column];
return label == null ? resultMetaData.columns[column].getNameString()
: label;
}
/**
* <!-- start generic documentation -->
* Get the designated column's name.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* In HSQLDB, a ResultSet column name is determined using the following
* order of prcedence:<p>
*
* <OL>
* <LI>The name of the underlying columnm, if the ResultSet column
* represents a column in a table.</LI>
* <LI>The label or alias specified in the generating query.</LI>
* <L1>C1, C2, etc. for computed columns that have no label.</LI>
* </OL> <p>
*
* If the <code>jdbc.get_column_name</code> property of the JDBC Connection
* has been set to false, this method returns the same value as
* {@link #getColumnLabel(int)}.<p>
*
* </div>
* <!-- end release-specific documentation -->
*
* @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 {
checkColumn(column);
if (useColumnName) {
String name = resultMetaData.columns[--column].getNameString();
return name == null ? ""
: name;
}
return resultMetaData.columnLabels[--column];
}
/**
* <!-- start generic documentation -->
* Get the designated column's table's schema.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* Since 1.8.0.x, HSQLDB implements standard SQL SCHEMA support;
* this method returns the actual schema of the column's table.
* Columns generated in queries have no schema name.
* </div>
* <!-- end release-specific documentation -->
*
* @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 {
checkColumn(column);
String name = resultMetaData.columns[--column].getSchemaNameString();;
return name == null ? ""
: name;
}
/**
* <!-- start generic documentation -->
* (JDBC4 clarification:)
* Get the designated column's specified column size.
* For numeric data, this is the maximum precision. For character data, this is the [maximum] length in characters.
* For datetime datatypes, this is the [maximim] length in characters of the String representation (assuming the
* maximum allowed precision of the fractional seconds component). For binary data, this is the [maximum] length in bytes. For the ROWID datatype,
* this is the length in bytes[, as returned by the implementation-specific java.sql.RowId.getBytes() method]. 0 is returned for data types where the
* column size is not applicable.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* Starting with 1.8.0, HSQLDB reports the declared length or precision
* specifiers for table columns, if they are defined.<p>
*
* From 1.9.0, HSQLDB, reports the correct length or precision for
* computed columns according to the SQL Standard.<p>
* </div>
* <!-- end release-specific documentation -->
*
* @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 {
checkColumn(column);
// type in columnTypes overrides column type
Type type = resultMetaData.columnTypes[--column];
long precision = type.precision;
if (type.isDateTimeType() || type.isIntervalType()) {
precision = type.displaySize();
}
if (precision > Integer.MAX_VALUE) {
precision = Integer.MAX_VALUE;
}
return (int) precision;
}
/**
* <!-- start generic documentation -->
* Gets the designated column's number of digits to right of the decimal point.
* 0 is returned for data types where the scale is not applicable.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* Starting with 1.8.0, HSQLDB reports the declared
* scale for table columns.<p>
*
* From 1.9.0, HSQLDB, reports the correct scale for
* computed columns according to the SQL Standard.<p>
*
* <pre>
* sql.enforce_strict_size
* </pre>
* For datetime and interval types such as Timestamp or Time, the
* fractional second precision is reported.
* </div>
* <!-- end release-specific documentation -->
*
* @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 {
Type type = resultMetaData.columnTypes[--column];
return type.scale;
}
/**
* <!-- start generic documentation -->
* Gets the designated column's table name.
*
* <!-- end generic documentation -->
* @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 {
checkColumn(column);
String name = resultMetaData.columns[--column].getTableNameString();
return name == null ? ""
: name;
}
/**
* <!-- start generic documentation -->
* Gets the designated column's table's catalog name.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* From 1.9.0, HSQLDB returns the name of the catalog. The default name is
* PUBLIC.
* This value can be changed for the database using an SQL command.<p>
*
* HSQLDB supports use of catalog qualification in DLL or DML when it is
* allowed by the Standard. <p>
*
* However, not all clients respect the SQL Standard and may use a
* catalog qualifier in a context where it is not suppoted by the Standard.
* <p>
*
* For greater detail, see discussion at:
* {@link JDBCDatabaseMetaData}. <p>
*
* </div>
* <!-- end release-specific documentation -->
*
* @param column the first column is 1, the second is 2, ...
* @return the name of the catalog for the table in which the given column
* appears or "" if not applicable
* @exception SQLException if a database access error occurs
*/
public String getCatalogName(int column) throws SQLException {
checkColumn(column);
String name = resultMetaData.columns[--column].getCatalogNameString();
return name == null ? ""
: name;
}
/**
* <!-- start generic documentation -->
* Retrieves the designated column's SQL type.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* This reports the SQL type code of the column. For time and timestamp
* types that are WITH TIME ZONE, the values as the SQL Standarc CLI
* codes.<p>
*
* </div>
* <!-- end release-specific documentation -->
*
*
* @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 java.sql.Types
*/
public int getColumnType(int column) throws SQLException {
checkColumn(column);
Type type = resultMetaData.columnTypes[--column];
return type.getJDBCTypeCode();
}
/**
* <!-- start generic documentation -->
* Retrieves the designated column's database-specific type name.
* <!-- end generic documentation -->
*
* @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 {
checkColumn(column);
Type type = resultMetaData.columnTypes[--column];
return type.getNameString();
}
/**
* <!-- start generic documentation -->
* Indicates whether the designated column is definitely not writable.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* From 1.9.0 this method returns true if the ResuleSet is not updatable
* or the column in question is not updatable.<p>
* </div>
* <!-- end release-specific documentation -->
*
* @param column the first column is 1, the second is 2, ...
* @return <code>true</code> if so; <code>false</code> otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isReadOnly(int column) throws SQLException {
checkColumn(column);
return !resultMetaData.columns[--column].isWriteable();
}
/**
* <!-- start generic documentation -->
* Indicates whether it is possible for a write on the designated column to
* succeed.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* From 1.9.0 this method returns false if the ResuleSet is not updatable
* or the column in question is not updatable.<p>
*
* </div>
* <!-- end release-specific documentation -->
*
* @param column the first column is 1, the second is 2, ...
* @return <code>true</code> if so; <code>false</code> otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isWritable(int column) throws SQLException {
checkColumn(column);
return resultMetaData.colIndexes != null
&& resultMetaData.colIndexes[--column] > -1;
}
/**
* <!-- start generic documentation -->
* Indicates whether a write on the designated column will definitely succeed.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* From 1.9.0 this method returns false if the ResuleSet is not updatable
* or the column in question is not updatable.<p>
*
* </div>
* <!-- end release-specific documentation -->
*
* @param column the first column is 1, the second is 2, ...
* @return <code>true</code> if so; <code>false</code> otherwise
* @exception SQLException if a database access error occurs
*/
public boolean isDefinitelyWritable(int column) throws SQLException {
checkColumn(column);
return resultMetaData.colIndexes != null
&& resultMetaData.colIndexes[--column] > -1;
}
//--------------------------JDBC 2.0-----------------------------------
/**
* <!-- start generic documentation -->
* <p>Returns the fully-qualified name of the Java class whose instances
* are manufactured if the method <code>ResultSet.getObject</code>
* is called to retrieve a value
* from the column. <code>ResultSet.getObject</code> may return a subclass of the
* class returned by this method.
* <!-- end generic documentation -->
*
* <!-- start Release-specific documentation -->
* <div class="ReleaseSpecificDocumentation">
* <h3>HSQLDB-Specific Information:</h3> <p>
*
* HSQLDB 1.9.0 fully supports this feature.<p>
*
* For columns of type OTHER, there is no specific class name and
* java.lang.Object is returned.
*
* </div>
* <!-- end release-specific documentation -->
*
* @param column the first column is 1, the second is 2, ...
* @return the fully-qualified name of the class in the Java programming
* language that would be used by the method
* <code>ResultSet.getObject</code> 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 JDK 1.2 (JDK 1.1.x developers: read the overview for
* JDBCResultSet)
*/
public String getColumnClassName(int column) throws SQLException {
checkColumn(column);
Type type = resultMetaData.columnTypes[--column];
return type.getJDBCClassName();
}
//----------------------------- JDBC 4.0 -----------------------------------
// ------------------- java.sql.Wrapper implementation ---------------------
/**
* Returns an object that implements the given interface to allow access to
* non-standard methods, or standard methods not exposed by the proxy.
*
* If the receiver implements the interface then the result is the receiver
* or a proxy for the receiver. If the receiver is a wrapper
* and the wrapped object implements the interface then the result is the
* wrapped object or a proxy for the wrapped object. Otherwise return the
* the result of calling <code>unwrap</code> recursively on the wrapped object
* or a proxy for that result. 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 JDK 1.6, HSQLDB 1.8.x
*/
//#ifdef JAVA6
@SuppressWarnings("unchecked")
public <T>T unwrap(java.lang.Class<T> iface) throws java.sql.SQLException {
if (isWrapperFor(iface)) {
return (T) this;
}
throw Util.invalidArgument("iface: " + iface);
}
//#endif JAVA6
/**
* 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 iface 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 JDK 1.6, HSQLDB 1.8.x
*/
//#ifdef JAVA6
public boolean isWrapperFor(
java.lang.Class<?> iface) throws java.sql.SQLException {
return (iface != null && iface.isAssignableFrom(this.getClass()));
}
//#endif JAVA6
// ------------------------- Internal Implementation ---------------------------
private ResultMetaData resultMetaData;
/**
* Whether to use the underlying column name or label when reporting
* getColumnName().
*/
private boolean useColumnName;
private int columnCount;
/**
* Constructs a new JDBCResultSetMetaData object from the specified
* JDBCResultSet and HsqlProprties objects.
*
* @param meta the ResultMetaData object from which to construct a new
* JDBCResultSetMetaData object
* @param props the HsqlProperties object from which to construct a
* new JDBCResultSetMetaData object
* @throws SQLException if a database access error occurs
*/
JDBCResultSetMetaData(ResultMetaData meta, boolean isUpdatable,
boolean isInsertable,
HsqlProperties props) throws SQLException {
init(meta, props);
}
/**
* Initializes this JDBCResultSetMetaData object from the specified
* Result and HsqlProperties objects.
*
* @param meta the ResultMetaData object from which to initialize this
* JDBCResultSetMetaData object
* @param props the HsqlProperties object from which to initialize this
* JDBCResultSetMetaData object
* @throws SQLException if a database access error occurs
*/
void init(ResultMetaData meta, HsqlProperties props) throws SQLException {
resultMetaData = meta;
columnCount = resultMetaData.getColumnCount();
// fredt - props is null for internal connections, so always use the
// default behaviour in this case
// JDBCDriver.getPropertyInfo says
// default is true
useColumnName = (props == null) ? true
: props.isPropertyTrue(
"get_column_name", true);
}
/**
* Performs an internal check for column index validity. <p>
*
* @param column index of column to check
* @throws SQLException when this object's parent ResultSet has
* no such column
*/
private void checkColumn(int column) throws SQLException {
if (column < 1 || column > columnCount) {
throw Util.sqlException(ErrorCode.JDBC_COLUMN_NOT_FOUND,
String.valueOf(column));
}
}
/**
* Returns a string representation of the object. <p>
*
* The string consists of the name of the class of which the
* object is an instance, the at-sign character `<code>@</code>',
* the unsigned hexadecimal representation of the hash code of the
* object and a comma-delimited list of this object's indexed attributes,
* enclosed in square brakets.
*
* @return a string representation of the object.
*/
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append(super.toString());
if (columnCount == 0) {
sb.append("[columnCount=0]");
return sb.toString();
}
sb.append('[');
for (int i = 0; i < columnCount; i++) {
JDBCColumnMetaData meta = getColumnMetaData(i + 1);
sb.append('\n');
sb.append(" column_");
sb.append(i + 1);
sb.append('=');
sb.append(meta);
if (i + 1 < columnCount) {
sb.append(',');
sb.append(' ');
}
}
sb.append('\n');
sb.append(']');
return sb.toString();
}
JDBCColumnMetaData getColumnMetaData(int i) {
JDBCColumnMetaData meta = new JDBCColumnMetaData();
try {
meta.catalogName = getCatalogName(i);
meta.columnClassName = getColumnClassName(i);
meta.columnDisplaySize = getColumnDisplaySize(i);
meta.columnLabel = getColumnLabel(i);
meta.columnName = getColumnName(i);
meta.columnType = getColumnType(i);
meta.isAutoIncrement = isAutoIncrement(i);
meta.isCaseSensitive = isCaseSensitive(i);
meta.isCurrency = isCurrency(i);
meta.isDefinitelyWritable = isDefinitelyWritable(i);
meta.isNullable = isNullable(i);
meta.isReadOnly = isReadOnly(i);
meta.isSearchable = isSearchable(i);
meta.isSigned = isSigned(i);
meta.isWritable = isWritable(i);
meta.precision = getPrecision(i);
meta.scale = getScale(i);
meta.schemaName = getSchemaName(i);
meta.tableName = getTableName(i);
} catch (SQLException e) {
}
return meta;
}
}