jTDS JDBC Driver Source Code Files
jTDS JDBC Driver Source Code Files are provided in the
source package file, jtds-1.3.1-fyi.zip.
You can browse jTDS JDBC Driver Source Code files below:
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⏎ net/sourceforge/jtds/jdbc/CachedResultSet.java
//jTDS JDBC Driver for Microsoft SQL Server and Sybase
//Copyright (C) 2004 The jTDS Project
//
//This library is free software; you can redistribute it and/or
//modify it under the terms of the GNU Lesser General Public
//License as published by the Free Software Foundation; either
//version 2.1 of the License, or (at your option) any later version.
//
//This library 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
//Lesser General Public License for more details.
//
//You should have received a copy of the GNU Lesser General Public
//License along with this library; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
package net.sourceforge.jtds.jdbc;
import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.Types;
import java.util.ArrayList;
import java.util.HashSet;
/**
* A memory cached scrollable/updateable result set.
* <p/>
* Notes:
* <ol>
* <li>For maximum performance use the scroll insensitive result set type.
* <li>As the result set is cached in memory this implementation is limited
* to small result sets.
* <li>Updateable or scroll sensitive result sets are limited to selects
* which reference one table only.
* <li>Scroll sensitive result sets must have primary keys.
* <li>Updates are optimistic. To guard against lost updates it is
* recommended that the table includes a timestamp column.
* <li>This class is a plug-in replacement for the MSCursorResultSet class
* which may be advantageous in certain applications as the scroll
* insensitive result set implemented here is much faster than the server
* side cursor.
* <li>Updateable result sets cannot be built from the output of stored
* procedures.
* <li>This implementation uses 'select ... for browse' to obtain the column
* meta data needed to generate update statements etc.
* <li>Named forward updateable cursors are also supported in which case
* positioned updates and deletes are used referencing a server side
* declared cursor.
* <li>Named forward read only declared cursors can have a larger fetch size
* specified allowing a cursor alternative to the default direct select
* method.
* </ol>
*
* @author Mike Hutchinson
* @version $Id: CachedResultSet.java,v 1.26 2007-07-08 17:28:23 bheineman Exp $
* @todo Should add a "close statement" flag to the constructors
*/
public class CachedResultSet extends JtdsResultSet {
/** Indicates currently inserting. */
protected boolean onInsertRow;
/** Buffer row used for inserts. */
protected ParamInfo[] insertRow;
/** The "update" row. */
protected ParamInfo[] updateRow;
// FIXME Remember if the row was updated/deleted for each row in the ResultSet
/** Indicates that row has been updated. */
protected boolean rowUpdated;
/** Indicates that row has been deleted. */
protected boolean rowDeleted;
/** True if this is a local temporary result set. */
protected final boolean tempResultSet;
/** Cursor TdsCore object. */
protected final TdsCore cursorTds;
/** Updates TdsCore object used for positioned updates. */
protected final TdsCore updateTds;
/** Flag to indicate Sybase. */
protected boolean isSybase;
/** Fetch size has been changed. */
protected boolean sizeChanged;
/** Original SQL statement. */
protected String sql;
/** Original procedure name. */
protected final String procName;
/** Original parameters. */
protected final ParamInfo[] procedureParams;
/** Table is keyed. */
protected boolean isKeyed;
/** First table name in select. */
protected String tableName;
/** The parent connection object */
protected JtdsConnection connection;
/**
* Constructs a new cached result set.
* <p/>
* This result set will either be cached in memory or, if the cursor name
* is set, can be a forward only server side cursor. This latter form of
* cursor can also support positioned updates.
*
* @param statement the parent statement object
* @param sql the SQL statement used to build the result set
* @param procName an optional stored procedure name
* @param procedureParams parameters for prepared statements
* @param resultSetType the result set type eg scrollable
* @param concurrency the result set concurrency eg updateable
* @exception SQLException if an error occurs
*/
CachedResultSet(JtdsStatement statement,
String sql,
String procName,
ParamInfo[] procedureParams,
int resultSetType,
int concurrency) throws SQLException {
super(statement, resultSetType, concurrency, null);
connection = (JtdsConnection) statement.getConnection();
cursorTds = statement.getTds();
this.sql = sql;
this.procName = procName;
this.procedureParams = procedureParams;
if (resultSetType == ResultSet.TYPE_FORWARD_ONLY
&& concurrency != ResultSet.CONCUR_READ_ONLY
&& cursorName != null) {
// Need an addtional TDS for positioned updates
updateTds = new TdsCore(connection, statement.getMessages());
} else {
updateTds = cursorTds;
}
isSybase = Driver.SYBASE == connection.getServerType();
tempResultSet = false;
//
// Now create the specified type of cursor
//
cursorCreate();
}
/**
* Constructs a cached result set based on locally generated data.
*
* @param statement the parent statement object
* @param colName array of column names
* @param colType array of corresponding data types
* @exception SQLException if an error occurs
*/
CachedResultSet(JtdsStatement statement,
String[] colName, int[] colType) throws SQLException {
super(statement, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_UPDATABLE, null);
//
// Construct the column descriptor array
//
columns = new ColInfo[colName.length];
for (int i = 0; i < colName.length; i++) {
ColInfo ci = new ColInfo();
ci.name = colName[i];
ci.realName = colName[i];
ci.jdbcType = colType[i];
ci.isCaseSensitive = false;
ci.isIdentity = false;
ci.isWriteable = false;
ci.nullable = 2;
ci.scale = 0;
TdsData.fillInType(ci);
columns[i] = ci;
}
columnCount = getColumnCount(columns);
rowData = new ArrayList(INITIAL_ROW_COUNT);
rowsInResult = 0;
pos = POS_BEFORE_FIRST;
tempResultSet = true;
cursorName = null;
cursorTds = null;
updateTds = null;
procName = null;
procedureParams = null;
}
/**
* Creates a cached result set with the same columns (and optionally data)
* as an existing result set.
*
* @param rs the result set to copy
* @param load load data from the supplied result set
* @throws SQLException if an error occurs
*/
CachedResultSet(JtdsResultSet rs, boolean load) throws SQLException {
super((JtdsStatement)rs.getStatement(),
rs.getStatement().getResultSetType(),
rs.getStatement().getResultSetConcurrency(), null);
//
JtdsStatement stmt = ((JtdsStatement) rs.getStatement());
//
// OK If the user requested an updateable result set tell them
// they can't have one!
//
if (concurrency != ResultSet.CONCUR_READ_ONLY) {
concurrency = ResultSet.CONCUR_READ_ONLY;
stmt.addWarning(new SQLWarning(
Messages.get("warning.cursordowngraded",
"CONCUR_READ_ONLY"), "01000"));
}
//
// If the user requested a scroll sensitive cursor tell them
// they can't have that either!
//
if (resultSetType >= ResultSet.TYPE_SCROLL_SENSITIVE) {
resultSetType = ResultSet.TYPE_SCROLL_INSENSITIVE;
stmt.addWarning(new SQLWarning(
Messages.get("warning.cursordowngraded",
"TYPE_SCROLL_INSENSITIVE"), "01000"));
}
columns = rs.getColumns();
columnCount = getColumnCount(columns);
rowData = new ArrayList(INITIAL_ROW_COUNT);
rowsInResult = 0;
pos = POS_BEFORE_FIRST;
tempResultSet = true;
cursorName = null;
cursorTds = null;
updateTds = null;
procName = null;
procedureParams = null;
//
// Load result set into buffer
//
if (load) {
while (rs.next()) {
rowData.add(copyRow(rs.getCurrentRow()));
}
rowsInResult = rowData.size();
}
}
/**
* Creates a cached result set containing one row.
*
* @param statement the parent statement object
* @param columns the column descriptor array
* @param data the row data
* @throws SQLException if an error occurs
*/
CachedResultSet(JtdsStatement statement,
ColInfo columns[], Object data[]) throws SQLException {
super(statement, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, null);
this.columns = columns;
columnCount = getColumnCount(columns);
rowData = new ArrayList(1);
rowsInResult = 1;
pos = POS_BEFORE_FIRST;
tempResultSet = true;
cursorName = null;
rowData.add(copyRow(data));
cursorTds = null;
updateTds = null;
procName = null;
procedureParams = null;
}
/**
* <p> <b>Warning! Ensure the provided data matches the column layout of this
* {@link ResultSet}. All kind of weird behavior and errors could be expected
* otherwise. </b></p>
*
* @param data
* data of the row to add
*/
void addRow( Object data[] )
{
rowsInResult ++;
rowData.add( copyRow( data ) );
}
/**
* Modify the concurrency of the result set.
* <p/>
* Use to make result set read only once loaded.
*
* @param concurrency the concurrency value eg
* <code>ResultSet.CONCUR_READ_ONLY</code>
*/
void setConcurrency(int concurrency) {
this.concurrency = concurrency;
}
/**
* Creates a new scrollable result set in memory or a named server cursor.
*
* @exception SQLException if an error occurs
*/
private void cursorCreate()
throws SQLException {
//
boolean isSelect = false;
int requestedConcurrency = concurrency;
int requestedType = resultSetType;
//
// If the useCursor property is set we will try and use a server
// side cursor for forward read only cursors. With the default
// fetch size of 100 this is a reasonable emulation of the
// MS fast forward cursor.
//
if (cursorName == null
&& connection.getUseCursors()
&& resultSetType == ResultSet.TYPE_FORWARD_ONLY
&& concurrency == ResultSet.CONCUR_READ_ONLY) {
// The useCursors connection property was set true
// so we need to create a private cursor name
cursorName = connection.getCursorName();
}
//
// Validate the SQL statement to ensure we have a select.
//
if (resultSetType != ResultSet.TYPE_FORWARD_ONLY
|| concurrency != ResultSet.CONCUR_READ_ONLY
|| cursorName != null) {
//
// We are going to need access to a SELECT statement for
// this to work. Reparse the SQL now and check.
//
String tmp[] = SQLParser.parse(sql, new ArrayList(),
(JtdsConnection) statement.getConnection(), true);
if ("select".equals(tmp[2])) {
isSelect = true;
if (tmp[3] != null && tmp[3].length() > 0) {
// OK We have a select with at least one table.
tableName = tmp[3];
} else {
// Can't find a table name so can't update
concurrency = ResultSet.CONCUR_READ_ONLY;
}
} else {
// No good we can't update and we can't declare a cursor
cursorName = null;
concurrency = ResultSet.CONCUR_READ_ONLY;
if (resultSetType != ResultSet.TYPE_FORWARD_ONLY) {
resultSetType = ResultSet.TYPE_SCROLL_INSENSITIVE;
}
}
}
//
// If a cursor name is specified we try and declare a conventional cursor.
// A server error will occur if we try to create a named cursor on a non
// select statement.
//
if (cursorName != null) {
//
// Create and execute DECLARE CURSOR
//
StringBuilder cursorSQL =
new StringBuilder(sql.length() + cursorName.length()+ 128);
cursorSQL.append("DECLARE ").append(cursorName)
.append(" CURSOR FOR ");
//
// We need to adjust any parameter offsets now as the prepended
// DECLARE CURSOR will throw the parameter positions off.
//
ParamInfo[] parameters = procedureParams;
if (procedureParams != null && procedureParams.length > 0) {
parameters = new ParamInfo[procedureParams.length];
int offset = cursorSQL.length();
for (int i = 0; i < parameters.length; i++) {
// Clone parameters to avoid corrupting offsets in original
parameters[i] = (ParamInfo) procedureParams[i].clone();
parameters[i].markerPos += offset;
}
}
cursorSQL.append(sql);
cursorTds.executeSQL(cursorSQL.toString(), null, parameters,
false, statement.getQueryTimeout(), statement.getMaxRows(),
statement.getMaxFieldSize(), true);
cursorTds.clearResponseQueue();
cursorTds.getMessages().checkErrors();
//
// OK now open cursor and fetch the first set (fetchSize) rows
//
cursorSQL.setLength(0);
cursorSQL.append("\r\nOPEN ").append(cursorName);
if (fetchSize > 1 && isSybase) {
cursorSQL.append("\r\nSET CURSOR ROWS ").append(fetchSize);
cursorSQL.append(" FOR ").append(cursorName);
}
cursorSQL.append("\r\nFETCH ").append(cursorName);
cursorTds.executeSQL(cursorSQL.toString(), null, null, false,
statement.getQueryTimeout(), statement.getMaxRows(),
statement.getMaxFieldSize(), true);
//
// Check we have a result set
//
while (!cursorTds.getMoreResults() && !cursorTds.isEndOfResponse());
if (!cursorTds.isResultSet()) {
// Throw exception but queue up any others
SQLException ex = new SQLException(
Messages.get("error.statement.noresult"), "24000");
ex.setNextException(statement.getMessages().exceptions);
throw ex;
}
columns = cursorTds.getColumns();
if (connection.getServerType() == Driver.SQLSERVER) {
// Last column will be rowstat but will not be marked as hidden
// as we do not have the Column meta data returned by the API
// cursor.
// Hide it now to avoid confusion (also should not be updated).
if (columns.length > 0) {
columns[columns.length - 1].isHidden = true;
}
}
columnCount = getColumnCount(columns);
rowsInResult = cursorTds.isDataInResultSet() ? 1 : 0;
} else {
//
// Open a memory cached scrollable or forward only possibly updateable cursor
//
if (isSelect && (concurrency != ResultSet.CONCUR_READ_ONLY
|| resultSetType >= ResultSet.TYPE_SCROLL_SENSITIVE)) {
// Need to execute SELECT .. FOR BROWSE to get
// the MetaData we require for updates etc
// OK Should have an SQL select statement
// append " FOR BROWSE" to obtain table names
// NB. We can't use any jTDS temporary stored proc
cursorTds.executeSQL(sql + " FOR BROWSE", null, procedureParams,
false, statement.getQueryTimeout(),
statement.getMaxRows(), statement.getMaxFieldSize(),
true);
while (!cursorTds.getMoreResults() && !cursorTds.isEndOfResponse());
if (!cursorTds.isResultSet()) {
// Throw exception but queue up any others
SQLException ex = new SQLException(
Messages.get("error.statement.noresult"), "24000");
ex.setNextException(statement.getMessages().exceptions);
throw ex;
}
columns = cursorTds.getColumns();
columnCount = getColumnCount(columns);
rowData = new ArrayList(INITIAL_ROW_COUNT);
//
// Load result set into buffer
//
cacheResultSetRows();
rowsInResult = rowData.size();
pos = POS_BEFORE_FIRST;
//
// If cursor is built over one table and the table has
// key columns then the result set is updateable and / or
// can be used as a scroll sensitive result set.
//
if (!isCursorUpdateable()) {
// No so downgrade
concurrency = ResultSet.CONCUR_READ_ONLY;
if (resultSetType != ResultSet.TYPE_FORWARD_ONLY) {
resultSetType = ResultSet.TYPE_SCROLL_INSENSITIVE;
}
}
} else {
//
// Create a read only cursor using direct SQL
//
cursorTds.executeSQL(sql, procName, procedureParams, false,
statement.getQueryTimeout(), statement.getMaxRows(),
statement.getMaxFieldSize(), true);
while (!cursorTds.getMoreResults() && !cursorTds.isEndOfResponse());
if (!cursorTds.isResultSet()) {
// Throw exception but queue up any others
SQLException ex = new SQLException(
Messages.get("error.statement.noresult"), "24000");
ex.setNextException(statement.getMessages().exceptions);
throw ex;
}
columns = cursorTds.getColumns();
columnCount = getColumnCount(columns);
rowData = new ArrayList(INITIAL_ROW_COUNT);
//
// Load result set into buffer
//
cacheResultSetRows();
rowsInResult = rowData.size();
pos = POS_BEFORE_FIRST;
}
}
//
// Report any cursor downgrade warnings
//
if (concurrency < requestedConcurrency) {
statement.addWarning(new SQLWarning(
Messages.get("warning.cursordowngraded",
"CONCUR_READ_ONLY"), "01000"));
}
if (resultSetType < requestedType) {
statement.addWarning(new SQLWarning(
Messages.get("warning.cursordowngraded",
"TYPE_SCROLL_INSENSITIVE"), "01000"));
}
//
// Report any SQLExceptions
//
statement.getMessages().checkErrors();
}
/**
* Analyses the tables in the result set and determines if the primary key
* columns needed to make it updateable exist.
* <p/>
* Sybase (and SQL 6.5) will automatically include any additional key and
* timestamp columns as hidden fields even if the user does not reference
* them in the select statement.
* <p/>
* If the table is unkeyed but there is an identity column then this is
* promoted to a key.
* <p/>
* Alternatively we can update, provided all the columns in the table row
* have been selected, by regarding all of them as keys.
* <p/>
* SQL Server 7+ does not return the correct primary key meta data for
* temporary tables so the driver has to query the catalog to locate any
* keys.
*
* @return <code>true<code> if there is one table and it is keyed
*/
boolean isCursorUpdateable() throws SQLException {
//
// Get fully qualified table names and check keys
//
isKeyed = false;
HashSet tableSet = new HashSet();
for (int i = 0; i < columns.length; i++) {
ColInfo ci = columns[i];
if (ci.isKey) {
// If a table lacks a key Sybase flags all columns except timestamps as keys.
// This does not make much sense in the case of text or image fields!
if ("text".equals(ci.sqlType) || "image".equals(ci.sqlType)) {
ci.isKey = false;
} else {
isKeyed = true;
}
} else
if (ci.isIdentity) {
// This is a good choice for a row identifier!
ci.isKey = true;
isKeyed = true;
}
StringBuilder key = new StringBuilder();
if (ci.tableName != null && ci.tableName.length() > 0) {
key.setLength(0);
if (ci.catalog != null) {
key.append(ci.catalog).append('.');
if (ci.schema == null) {
key.append('.');
}
}
if (ci.schema != null) {
key.append(ci.schema).append('.');
}
key.append(ci.tableName);
tableName = key.toString();
tableSet.add(tableName);
}
}
//
// MJH - SQL Server 7/2000 does not return key information for temporary tables.
// I regard this as a bug!
// See if we can find up to the first 8 index columns for ourselves.
//
if (tableName.startsWith("#") && cursorTds.getTdsVersion() >= Driver.TDS70) {
StringBuilder sql = new StringBuilder(1024);
sql.append("SELECT ");
for (int i = 1; i <= 8; i++) {
if (i > 1) {
sql.append(',');
}
sql.append("index_col('tempdb..").append(tableName);
sql.append("', indid, ").append(i).append(')');
}
sql.append(" FROM tempdb..sysindexes WHERE id = object_id('tempdb..");
sql.append(tableName).append("') AND indid > 0 AND ");
sql.append("(status & 2048) = 2048");
cursorTds.executeSQL(sql.toString(), null, null, false, 0,
statement.getMaxRows(), statement.getMaxFieldSize(), true);
while (!cursorTds.getMoreResults() && !cursorTds.isEndOfResponse());
if (cursorTds.isResultSet() && cursorTds.getNextRow())
{
Object row[] = cursorTds.getRowData();
for (int i =0 ; i < row.length; i++) {
String name = (String)row[i];
if (name != null) {
for (int c = 0; c < columns.length; c++) {
if (columns[c].realName != null &&
columns[c].realName.equalsIgnoreCase(name)) {
columns[c].isKey = true;
isKeyed = true;
break;
}
}
}
}
}
// Report any errors found
statement.getMessages().checkErrors();
}
//
// Final fall back make all columns pseudo keys!
// Sybase seems to do this automatically.
//
if (!isKeyed) {
for (int i = 0; i < columns.length; i++) {
String type = columns[i].sqlType;
if (!"ntext".equals(type) &&
!"text".equals(type) &&
!"image".equals(type) &&
!"timestamp".equals(type) &&
columns[i].tableName != null) {
columns[i].isKey = true;
isKeyed = true;
}
}
}
return (tableSet.size() == 1 && isKeyed);
}
/**
* Fetches the next result row from the internal row array.
*
* @param rowNum the row number to fetch
* @return <code>true</code> if a result set row is returned
* @throws SQLException if an error occurs
*/
private boolean cursorFetch(int rowNum)
throws SQLException {
rowUpdated = false;
//
if (cursorName != null) {
//
// Using a conventional forward only server cursor
//
if (!cursorTds.getNextRow()) {
// Need to fetch more rows from server
StringBuilder sql = new StringBuilder(128);
if (isSybase && sizeChanged) {
// Sybase allows us to set a fetch size
sql.append("SET CURSOR ROWS ").append(fetchSize);
sql.append(" FOR ").append(cursorName);
sql.append("\r\n");
}
sql.append("FETCH ").append(cursorName);
// Get the next row or block of rows.
cursorTds.executeSQL(sql.toString(), null, null, false,
statement.getQueryTimeout(), statement.getMaxRows(),
statement.getMaxFieldSize(), true);
while (!cursorTds.getMoreResults() && !cursorTds.isEndOfResponse());
sizeChanged = false; // Indicate fetch size updated
if (!cursorTds.isResultSet() || !cursorTds.getNextRow()) {
pos = POS_AFTER_LAST;
currentRow = null;
statement.getMessages().checkErrors();
return false;
}
}
currentRow = statement.getTds().getRowData();
pos++;
rowsInResult = pos;
statement.getMessages().checkErrors();
return currentRow != null;
}
//
// JDBC2 style Scrollable and/or Updateable cursor
//
if (rowsInResult == 0) {
pos = POS_BEFORE_FIRST;
currentRow = null;
return false;
}
if (rowNum == pos) {
// On current row
//
return true;
}
if (rowNum < 1) {
currentRow = null;
pos = POS_BEFORE_FIRST;
return false;
}
if (rowNum > rowsInResult) {
currentRow = null;
pos = POS_AFTER_LAST;
return false;
}
pos = rowNum;
currentRow = (Object[])rowData.get(rowNum-1);
rowDeleted = currentRow == null;
if (resultSetType >= ResultSet.TYPE_SCROLL_SENSITIVE &&
currentRow != null) {
refreshRow();
}
return true;
}
/**
* Closes the result set.
*/
private void cursorClose() throws SQLException {
if (cursorName != null) {
statement.clearWarnings();
String sql;
if (isSybase) {
sql = "CLOSE " + cursorName +
"\r\nDEALLOCATE CURSOR " + cursorName;
} else {
sql = "CLOSE " + cursorName +
"\r\nDEALLOCATE " + cursorName;
}
cursorTds.submitSQL(sql);
}
rowData = null;
}
/**
* Creates a parameter object for an UPDATE, DELETE or INSERT statement.
*
* @param pos the substitution position of the parameter marker in the SQL
* @param info the <code>ColInfo</code> column descriptor
* @param value the column data item
* @return the new parameter as a <code>ParamInfo</code> object
*/
protected static ParamInfo buildParameter(int pos, ColInfo info, Object value, boolean isUnicode)
throws SQLException {
int length = 0;
if (value instanceof String) {
length = ((String)value).length();
} else
if (value instanceof byte[]) {
length = ((byte[])value).length;
} else
if (value instanceof BlobImpl) {
BlobImpl blob = (BlobImpl)value;
value = blob.getBinaryStream();
length = (int)blob.length();
} else
if (value instanceof ClobImpl) {
ClobImpl clob = (ClobImpl)value;
value = clob.getCharacterStream();
length = (int)clob.length();
}
ParamInfo param = new ParamInfo(info, null, value, length);
param.isUnicode = "nvarchar".equals(info.sqlType) ||
"nchar".equals(info.sqlType) ||
"ntext".equals(info.sqlType) ||
isUnicode;
param.markerPos = pos;
return param;
}
/**
* Sets the specified column's data value.
*
* @param colIndex index of the column
* @param value new column value
* @return the value, possibly converted to an internal type
*/
protected Object setColValue(int colIndex, int jdbcType, Object value, int length)
throws SQLException {
value = super.setColValue(colIndex, jdbcType, value, length);
if (!onInsertRow && currentRow == null) {
throw new SQLException(Messages.get("error.resultset.norow"), "24000");
}
colIndex--;
ParamInfo pi;
ColInfo ci = columns[colIndex];
boolean isUnicode = TdsData.isUnicode(ci);
if (onInsertRow) {
pi = insertRow[colIndex];
if (pi == null) {
pi = new ParamInfo(-1, isUnicode);
pi.collation = ci.collation;
pi.charsetInfo = ci.charsetInfo;
insertRow[colIndex] = pi;
}
} else {
if (updateRow == null) {
updateRow = new ParamInfo[columnCount];
}
pi = updateRow[colIndex];
if (pi == null) {
pi = new ParamInfo(-1, isUnicode);
pi.collation = ci.collation;
pi.charsetInfo = ci.charsetInfo;
updateRow[colIndex] = pi;
}
}
if (value == null) {
pi.value = null;
pi.length = 0;
pi.jdbcType = ci.jdbcType;
pi.isSet = true;
if (pi.jdbcType == Types.NUMERIC || pi.jdbcType == Types.DECIMAL) {
pi.scale = TdsData.DEFAULT_SCALE;
} else {
pi.scale = 0;
}
} else {
pi.value = value;
pi.length = length;
pi.isSet = true;
pi.jdbcType = jdbcType;
if (pi.value instanceof BigDecimal) {
pi.scale = ((BigDecimal)pi.value).scale();
} else {
pi.scale = 0;
}
}
return value;
}
/**
* Builds a WHERE clause for UPDATE or DELETE statements.
*
* @param sql the SQL Statement to append the WHERE clause to
* @param params the parameter descriptor array for this statement
* @param select true if this WHERE clause will be used in a select
* statement
* @return the parameter list as a <code>ParamInfo[]</code>
* @throws SQLException if an error occurs
*/
ParamInfo[] buildWhereClause(StringBuilder sql, ArrayList params, boolean select)
throws SQLException {
//
// Now construct where clause
//
sql.append(" WHERE ");
if (cursorName != null) {
//
// Use a positioned update
//
sql.append(" CURRENT OF ").append(cursorName);
} else {
int count = 0;
for (int i = 0; i < columns.length; i++) {
if (currentRow[i] == null) {
if (!"text".equals(columns[i].sqlType)
&& !"ntext".equals(columns[i].sqlType)
&& !"image".equals(columns[i].sqlType)
&& columns[i].tableName != null) {
if (count > 0) {
sql.append(" AND ");
}
sql.append(columns[i].realName);
sql.append(" IS NULL");
}
} else {
if (isKeyed && select) {
// For refresh select only include key columns
if (columns[i].isKey) {
if (count > 0) {
sql.append(" AND ");
}
sql.append(columns[i].realName);
sql.append("=?");
count++;
params.add(buildParameter(sql.length() - 1, columns[i],
currentRow[i], connection.getUseUnicode()));
}
} else {
// Include all available 'searchable' columns in updates/deletes to protect
// against lost updates.
if (!"text".equals(columns[i].sqlType)
&& !"ntext".equals(columns[i].sqlType)
&& !"image".equals(columns[i].sqlType)
&& columns[i].tableName != null) {
if (count > 0) {
sql.append(" AND ");
}
sql.append(columns[i].realName);
sql.append("=?");
count++;
params.add(buildParameter(sql.length() - 1, columns[i],
currentRow[i], connection.getUseUnicode()));
}
}
}
}
}
return (ParamInfo[]) params.toArray(new ParamInfo[params.size()]);
}
/**
* Refreshes a result set row from keyed tables.
* <p/>
* If all the tables in the result set have primary keys then the result
* set row can be refreshed by refetching the individual table rows.
*
* @throws SQLException if an error occurs
*/
protected void refreshKeyedRows() throws SQLException
{
//
// Construct a SELECT statement
//
StringBuilder sql = new StringBuilder(100 + columns.length * 10);
sql.append("SELECT ");
int count = 0;
for (int i = 0; i < columns.length; i++) {
if (!columns[i].isKey && columns[i].tableName != null) {
if (count > 0) {
sql.append(',');
}
sql.append(columns[i].realName);
count++;
}
}
if (count == 0) {
// No non key columns in this table?
return;
}
sql.append(" FROM ");
sql.append(tableName);
//
// Construct a where clause using keyed columns only
//
ArrayList params = new ArrayList();
buildWhereClause(sql, params, true);
ParamInfo parameters[] = (ParamInfo[]) params.toArray(new ParamInfo[params.size()]);
//
// Execute the select
//
TdsCore tds = statement.getTds();
tds.executeSQL(sql.toString(), null, parameters, false, 0,
statement.getMaxRows(), statement.getMaxFieldSize(), true);
if (!tds.isEndOfResponse()) {
if (tds.getMoreResults() && tds.getNextRow()) {
// refresh the row data
Object col[] = tds.getRowData();
count = 0;
for (int i = 0; i < columns.length; i++) {
if (!columns[i].isKey) {
currentRow[i] = col[count++];
}
}
} else {
currentRow = null;
}
} else {
currentRow = null;
}
tds.clearResponseQueue();
statement.getMessages().checkErrors();
if (currentRow == null) {
rowData.set(pos-1, null);
rowDeleted = true;
}
}
/**
* Refreshes the row by rereading the result set.
* <p/>
* Obviously very slow on large result sets but may be the only option if
* tables do not have keys.
*/
protected void refreshReRead() throws SQLException
{
int savePos = pos;
cursorCreate();
absolute(savePos);
}
//
// -------------------- java.sql.ResultSet methods -------------------
//
public void setFetchSize(int size) throws SQLException {
sizeChanged = size != fetchSize;
super.setFetchSize(size);
}
public void afterLast() throws SQLException {
checkOpen();
checkScrollable();
if (pos != POS_AFTER_LAST) {
cursorFetch(rowsInResult+1);
}
}
public void beforeFirst() throws SQLException {
checkOpen();
checkScrollable();
if (pos != POS_BEFORE_FIRST) {
cursorFetch(0);
}
}
public void cancelRowUpdates() throws SQLException {
checkOpen();
checkUpdateable();
if (onInsertRow) {
throw new SQLException(Messages.get("error.resultset.insrow"), "24000");
}
if (updateRow != null) {
rowUpdated = false;
for (int i = 0; i < updateRow.length; i++) {
if (updateRow[i] != null) {
updateRow[i].clearInValue();
}
}
}
}
public void close() throws SQLException {
if (!closed) {
try {
cursorClose();
} finally {
closed = true;
statement = null;
}
}
}
public void deleteRow() throws SQLException {
checkOpen();
checkUpdateable();
if (currentRow == null) {
throw new SQLException(Messages.get("error.resultset.norow"), "24000");
}
if (onInsertRow) {
throw new SQLException(Messages.get("error.resultset.insrow"), "24000");
}
//
// Construct an SQL DELETE statement
//
StringBuilder sql = new StringBuilder(128);
ArrayList params = new ArrayList();
sql.append("DELETE FROM ");
sql.append(tableName);
//
// Create the WHERE clause
//
ParamInfo parameters[] = buildWhereClause(sql, params, false);
//
// Execute the delete statement
//
updateTds.executeSQL(sql.toString(), null, parameters, false, 0,
statement.getMaxRows(), statement.getMaxFieldSize(), true);
int updateCount = 0;
while (!updateTds.isEndOfResponse()) {
if (!updateTds.getMoreResults()) {
if (updateTds.isUpdateCount()) {
updateCount = updateTds.getUpdateCount();
}
}
}
updateTds.clearResponseQueue();
statement.getMessages().checkErrors();
if (updateCount == 0) {
// No delete. Possibly row was changed on database by another user?
throw new SQLException(Messages.get("error.resultset.deletefail"), "24000");
}
rowDeleted = true;
currentRow = null;
if (resultSetType != ResultSet.TYPE_FORWARD_ONLY) {
// Leave a 'hole' in the result set array.
rowData.set(pos-1, null);
}
}
public void insertRow() throws SQLException {
checkOpen();
checkUpdateable();
if (!onInsertRow) {
throw new SQLException(Messages.get("error.resultset.notinsrow"), "24000");
}
if (!tempResultSet) {
//
// Construct an SQL INSERT statement
//
StringBuilder sql = new StringBuilder(128);
ArrayList params = new ArrayList();
sql.append("INSERT INTO ");
sql.append(tableName);
int sqlLen = sql.length();
//
// Create column list
//
sql.append(" (");
int count = 0;
for (int i = 0; i < columnCount; i++) {
if (insertRow[i] != null) {
if (count > 0) {
sql.append(", ");
}
sql.append(columns[i].realName);
count++;
}
}
//
// Create new values list
//
sql.append(") VALUES(");
count = 0;
for (int i = 0; i < columnCount; i++) {
if (insertRow[i] != null) {
if (count > 0) {
sql.append(", ");
}
sql.append('?');
insertRow[i].markerPos = sql.length()-1;
params.add(insertRow[i]);
count++;
}
}
sql.append(')');
if (count == 0) {
// Empty insert
sql.setLength(sqlLen);
if (isSybase) {
sql.append(" VALUES()");
} else {
sql.append(" DEFAULT VALUES");
}
}
ParamInfo parameters[] = (ParamInfo[]) params.toArray(new ParamInfo[params.size()]);
//
// execute the insert statement
//
updateTds.executeSQL(sql.toString(), null, parameters, false, 0,
statement.getMaxRows(), statement.getMaxFieldSize(), true);
int updateCount = 0;
while (!updateTds.isEndOfResponse()) {
if (!updateTds.getMoreResults()) {
if (updateTds.isUpdateCount()) {
updateCount = updateTds.getUpdateCount();
}
}
}
updateTds.clearResponseQueue();
statement.getMessages().checkErrors();
if (updateCount < 1) {
// No Insert. Probably will not get here as duplicate key etc
// will have already been reported as an exception.
throw new SQLException(Messages.get("error.resultset.insertfail"), "24000");
}
}
//
if (resultSetType >= ResultSet.TYPE_SCROLL_SENSITIVE
|| (resultSetType == ResultSet.TYPE_FORWARD_ONLY && cursorName == null))
{
//
// Now insert copy of row into result set buffer
//
JtdsConnection con = (JtdsConnection)statement.getConnection();
Object row[] = newRow();
for (int i = 0; i < insertRow.length; i++) {
if (insertRow[i] != null) {
row[i] = Support.convert(con, insertRow[i].value,
columns[i].jdbcType, con.getCharset());
}
}
rowData.add(row);
}
rowsInResult++;
//
// Clear row data
//
for (int i = 0; insertRow != null && i < insertRow.length; i++) {
if (insertRow[i] != null) {
insertRow[i].clearInValue();
}
}
}
public void moveToCurrentRow() throws SQLException {
checkOpen();
checkUpdateable();
insertRow = null;
onInsertRow = false;
}
public void moveToInsertRow() throws SQLException {
checkOpen();
checkUpdateable();
insertRow = new ParamInfo[columnCount];
onInsertRow = true;
}
public void refreshRow() throws SQLException {
checkOpen();
if (onInsertRow) {
throw new SQLException(Messages.get("error.resultset.insrow"), "24000");
}
//
// If row is being updated discard updates now
//
if (concurrency != ResultSet.CONCUR_READ_ONLY) {
cancelRowUpdates();
rowUpdated = false;
}
if (resultSetType == ResultSet.TYPE_FORWARD_ONLY ||
currentRow == null) {
// Do not try and refresh the row in these cases.
return;
}
//
// If result set is keyed we can refresh the row data from the
// database using the key.
// NB. MS SQL Server #Temporary tables with keys are not identified correctly
// in the column meta data sent after 'for browse'. This means that
// temporary tables can not be used with this logic.
//
if (isKeyed) {
// OK all tables are keyed
refreshKeyedRows();
} else {
// No good have to use brute force approach
refreshReRead();
}
}
public void updateRow() throws SQLException {
checkOpen();
checkUpdateable();
rowUpdated = false;
rowDeleted = false;
if (currentRow == null) {
throw new SQLException(Messages.get("error.resultset.norow"), "24000");
}
if (onInsertRow) {
throw new SQLException(Messages.get("error.resultset.insrow"), "24000");
}
if (updateRow == null) {
// Nothing to update
return;
}
boolean keysChanged = false;
//
// Construct an SQL UPDATE statement
//
StringBuilder sql = new StringBuilder(128);
ArrayList params = new ArrayList();
sql.append("UPDATE ");
sql.append(tableName);
//
// OK now create assign new values
//
sql.append(" SET ");
int count = 0;
for (int i = 0; i < columnCount; i++) {
if (updateRow[i] != null) {
if (count > 0) {
sql.append(", ");
}
sql.append(columns[i].realName);
sql.append("=?");
updateRow[i].markerPos = sql.length()-1;
params.add(updateRow[i]);
count++;
if (columns[i].isKey) {
// Key is changing so in memory row will need to be deleted
// and reinserted at end of row buffer.
keysChanged = true;
}
}
}
if (count == 0) {
// There are no columns to update in this table
// so bail out now.
return;
}
//
// Now construct where clause
//
ParamInfo parameters[] = buildWhereClause(sql, params, false);
//
// Now execute update
//
updateTds.executeSQL(sql.toString(), null, parameters, false, 0,
statement.getMaxRows(), statement.getMaxFieldSize(), true);
int updateCount = 0;
while (!updateTds.isEndOfResponse()) {
if (!updateTds.getMoreResults()) {
if (updateTds.isUpdateCount()) {
updateCount = updateTds.getUpdateCount();
}
}
}
updateTds.clearResponseQueue();
statement.getMessages().checkErrors();
if (updateCount == 0) {
// No update. Possibly row was changed on database by another user?
throw new SQLException(Messages.get("error.resultset.updatefail"), "24000");
}
//
// Update local copy of data
//
if (resultSetType != ResultSet.TYPE_SCROLL_INSENSITIVE) {
// Make in memory copy reflect database update
// Could use refreshRow but this is much faster.
JtdsConnection con = (JtdsConnection)statement.getConnection();
for (int i = 0; i < updateRow.length; i++) {
if (updateRow[i] != null) {
if (updateRow[i].value instanceof byte[]
&& (columns[i].jdbcType == Types.CHAR ||
columns[i].jdbcType == Types.VARCHAR ||
columns[i].jdbcType == Types.LONGVARCHAR)) {
// Need to handle byte[] to varchar otherwise field
// will be set to hex string rather than characters.
try {
currentRow[i] = new String((byte[])updateRow[i].value, con.getCharset());
} catch (UnsupportedEncodingException e) {
currentRow[i] = new String((byte[])updateRow[i].value);
}
} else {
currentRow[i] = Support.convert(con, updateRow[i].value,
columns[i].jdbcType, con.getCharset());
}
}
}
}
//
// Update state of cached row data
//
if (keysChanged && resultSetType >= ResultSet.TYPE_SCROLL_SENSITIVE) {
// Leave hole at current position and add updated row to end of set
rowData.add(currentRow);
rowsInResult = rowData.size();
rowData.set(pos-1, null);
currentRow = null;
rowDeleted = true;
} else {
rowUpdated = true;
}
//
// Clear update values
//
cancelRowUpdates();
}
public boolean first() throws SQLException {
checkOpen();
checkScrollable();
return cursorFetch(1);
}
public boolean isLast() throws SQLException {
checkOpen();
return(pos == rowsInResult) && (rowsInResult != 0);
}
public boolean last() throws SQLException {
checkOpen();
checkScrollable();
return cursorFetch(rowsInResult);
}
public boolean next() throws SQLException {
checkOpen();
if (pos != POS_AFTER_LAST) {
return cursorFetch(pos+1);
} else {
return false;
}
}
public boolean previous() throws SQLException {
checkOpen();
checkScrollable();
if (pos == POS_AFTER_LAST) {
pos = rowsInResult+1;
}
return cursorFetch(pos-1);
}
public boolean rowDeleted() throws SQLException {
checkOpen();
return rowDeleted;
}
public boolean rowInserted() throws SQLException {
checkOpen();
// return pos > initialRowCnt;
return false; // Same as MSCursorResultSet
}
public boolean rowUpdated() throws SQLException {
checkOpen();
// return rowUpdated;
return false; // Same as MSCursorResultSet
}
public boolean absolute(int row) throws SQLException {
checkOpen();
checkScrollable();
if (row < 1) {
row = (rowsInResult + 1) + row;
}
return cursorFetch(row);
}
public boolean relative(int row) throws SQLException {
checkScrollable();
if (pos == POS_AFTER_LAST) {
return absolute((rowsInResult+1)+row);
} else {
return absolute(pos+row);
}
}
public String getCursorName() throws SQLException {
checkOpen();
// Hide internal cursor names
if (cursorName != null && !cursorName.startsWith("_jtds")) {
return cursorName;
}
throw new SQLException(Messages.get("error.resultset.noposupdate"), "24000");
}
}
⏎ net/sourceforge/jtds/jdbc/CachedResultSet.java
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