jTDS JDBC Driver Source Code Files
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⏎ net/sourceforge/jtds/jdbc/MSCursorResultSet.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.math.BigDecimal;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.Types;
import java.sql.ResultSet;
/**
* This class extends the JtdsResultSet to support scrollable and or
* updateable cursors on Microsoft servers.
* <p>The undocumented Microsoft sp_cursor procedures are used.
* <p>
* Implementation notes:
* <ol>
* <li>All of Alin's cursor result set logic is incorporated here.
* <li>This logic was originally implemented in the JtdsResultSet class but on reflection
* it seems that Alin's original approch of having a dedicated cursor class leads to a more
* flexible and maintainable design.
* </ol>
*
* @author Alin Sinpalean
* @author Mike Hutchinson
* @version $Id: MSCursorResultSet.java,v 1.59 2007-07-11 20:02:45 bheineman Exp $
*/
public class MSCursorResultSet extends JtdsResultSet {
/*
* Constants
*/
private static final Integer FETCH_FIRST = new Integer(1);
private static final Integer FETCH_NEXT = new Integer(2);
private static final Integer FETCH_PREVIOUS = new Integer(4);
private static final Integer FETCH_LAST = new Integer(8);
private static final Integer FETCH_ABSOLUTE = new Integer(16);
private static final Integer FETCH_RELATIVE = new Integer(32);
private static final Integer FETCH_REPEAT = new Integer(128);
private static final Integer FETCH_INFO = new Integer(256);
private static final int CURSOR_TYPE_KEYSET = 0x01;
private static final int CURSOR_TYPE_DYNAMIC = 0x02;
private static final int CURSOR_TYPE_FORWARD = 0x04;
private static final int CURSOR_TYPE_STATIC = 0x08;
private static final int CURSOR_TYPE_FASTFORWARDONLY = 0x10;
private static final int CURSOR_TYPE_PARAMETERIZED = 0x1000;
private static final int CURSOR_TYPE_AUTO_FETCH = 0x2000;
private static final int CURSOR_CONCUR_READ_ONLY = 1;
private static final int CURSOR_CONCUR_SCROLL_LOCKS = 2;
private static final int CURSOR_CONCUR_OPTIMISTIC = 4;
private static final int CURSOR_CONCUR_OPTIMISTIC_VALUES = 8;
private static final Integer CURSOR_OP_INSERT = new Integer(4);
private static final Integer CURSOR_OP_UPDATE = new Integer(33);
private static final Integer CURSOR_OP_DELETE = new Integer(34);
/**
* The row is dirty and needs to be reloaded (internal state).
*/
private static final Integer SQL_ROW_DIRTY = new Integer(0);
/**
* The row is valid.
*/
private static final Integer SQL_ROW_SUCCESS = new Integer(1);
/**
* The row has been deleted.
*/
private static final Integer SQL_ROW_DELETED = new Integer(2);
/*
* Instance variables.
*/
/** Set when <code>moveToInsertRow()</code> was called. */
private boolean onInsertRow;
/** The "insert row". */
private ParamInfo[] insertRow;
/** The "update row". */
private ParamInfo[] updateRow;
/** The row cache used instead {@link #currentRow}. */
private Object[][] rowCache;
/** Actual position of the cursor. */
private int cursorPos;
/** The cursor is being built asynchronously. */
private boolean asyncCursor;
//
// Fixed sp_XXX parameters
//
/** Cursor handle parameter. */
private final ParamInfo PARAM_CURSOR_HANDLE = new ParamInfo(Types.INTEGER, null, ParamInfo.INPUT);
/** <code>sp_cursorfetch</code> fetchtype parameter. */
private final ParamInfo PARAM_FETCHTYPE = new ParamInfo(Types.INTEGER, null, ParamInfo.INPUT);
/** <code>sp_cursorfetch</code> rownum IN parameter (for actual fetches). */
private final ParamInfo PARAM_ROWNUM_IN = new ParamInfo(Types.INTEGER, null, ParamInfo.INPUT);
/** <code>sp_cursorfetch</code> numrows IN parameter (for actual fetches). */
private final ParamInfo PARAM_NUMROWS_IN = new ParamInfo(Types.INTEGER, null, ParamInfo.INPUT);
/** <code>sp_cursorfetch</code> rownum OUT parameter (for FETCH_INFO). */
private final ParamInfo PARAM_ROWNUM_OUT = new ParamInfo(Types.INTEGER, null, ParamInfo.OUTPUT);
/** <code>sp_cursorfetch</code> numrows OUT parameter (for FETCH_INFO). */
private final ParamInfo PARAM_NUMROWS_OUT = new ParamInfo(Types.INTEGER, null, ParamInfo.OUTPUT);
/** <code>sp_cursor</code> optype parameter. */
private final ParamInfo PARAM_OPTYPE = new ParamInfo(Types.INTEGER, null, ParamInfo.INPUT);
/** <code>sp_cursor</code> rownum parameter. */
private final ParamInfo PARAM_ROWNUM = new ParamInfo(Types.INTEGER, new Integer(1), ParamInfo.INPUT);
/** <code>sp_cursor</code> table parameter. */
private final ParamInfo PARAM_TABLE = new ParamInfo(Types.VARCHAR, "", ParamInfo.UNICODE);
/**
* Construct a cursor result set using Microsoft sp_cursorcreate etc.
*
* @param statement The parent statement object or null.
* @param resultSetType one of FORWARD_ONLY, SCROLL_INSENSITIVE, SCROLL_SENSITIVE.
* @param concurrency One of CONCUR_READ_ONLY, CONCUR_UPDATE.
* @throws SQLException
*/
MSCursorResultSet(JtdsStatement statement,
String sql,
String procName,
ParamInfo[] procedureParams,
int resultSetType,
int concurrency)
throws SQLException {
super(statement, resultSetType, concurrency, null);
PARAM_NUMROWS_IN.value = new Integer(fetchSize);
rowCache = new Object[fetchSize][];
cursorCreate(sql, procName, procedureParams);
if (asyncCursor) {
// Obtain a provisional row count for the result set
cursorFetch(FETCH_REPEAT, 0);
}
}
/**
* Set 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 && getCurrentRow() == null) {
throw new SQLException(Messages.get("error.resultset.norow"), "24000");
}
colIndex--;
ParamInfo pi;
ColInfo ci = columns[colIndex];
if (onInsertRow) {
pi = insertRow[colIndex];
} else {
if (updateRow == null) {
updateRow = new ParamInfo[columnCount];
}
pi = updateRow[colIndex];
}
if (pi == null) {
pi = new ParamInfo(-1, TdsData.isUnicode(ci));
pi.name = '@'+ci.realName;
pi.collation = ci.collation;
pi.charsetInfo = ci.charsetInfo;
if (onInsertRow) {
insertRow[colIndex] = pi;
} else {
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;
pi.isUnicode = "ntext".equals(ci.sqlType)
|| "nchar".equals(ci.sqlType)
|| "nvarchar".equals(ci.sqlType);
if (pi.value instanceof BigDecimal) {
pi.scale = ((BigDecimal)pi.value).scale();
} else {
pi.scale = 0;
}
}
return value;
}
/**
* Get the specified column's data item.
*
* @param index the column index in the row
* @return the column value as an <code>Object</code>
* @throws SQLException if the index is out of bounds or there is no
* current row
*/
protected Object getColumn(int index) throws SQLException {
checkOpen();
if (index < 1 || index > columnCount) {
throw new SQLException(Messages.get("error.resultset.colindex",
Integer.toString(index)),
"07009");
}
Object[] currentRow;
if (onInsertRow || (currentRow = getCurrentRow()) == null) {
throw new SQLException(
Messages.get("error.resultset.norow"), "24000");
}
if (SQL_ROW_DIRTY.equals(currentRow[columns.length - 1])) {
cursorFetch(FETCH_REPEAT, 0);
currentRow = getCurrentRow();
}
Object data = currentRow[index - 1];
wasNull = data == null;
return data;
}
/**
* Translates a JDBC result set type into SQL Server native @scrollOpt value
* for use with stored procedures such as sp_cursoropen, sp_cursorprepare
* or sp_cursorprepexec.
*
* @param resultSetType JDBC result set type (one of the
* <code>ResultSet.TYPE_<i>XXX</i></code>
* values)
* @param resultSetConcurrency JDBC result set concurrency (one of the
* <code>ResultSet.CONCUR_<i>XXX</i></code>
* values)
* @return a value for the @scrollOpt parameter
*/
static int getCursorScrollOpt(int resultSetType,
int resultSetConcurrency,
boolean parameterized) {
int scrollOpt;
switch (resultSetType) {
case TYPE_SCROLL_INSENSITIVE:
scrollOpt = CURSOR_TYPE_STATIC;
break;
case TYPE_SCROLL_SENSITIVE:
scrollOpt = CURSOR_TYPE_KEYSET;
break;
case TYPE_SCROLL_SENSITIVE + 1:
scrollOpt = CURSOR_TYPE_DYNAMIC;
break;
case TYPE_FORWARD_ONLY:
default:
scrollOpt = (resultSetConcurrency == CONCUR_READ_ONLY)
? (CURSOR_TYPE_FASTFORWARDONLY | CURSOR_TYPE_AUTO_FETCH)
: CURSOR_TYPE_FORWARD;
break;
}
// If using sp_cursoropen need to set a flag on scrollOpt.
// The 0x1000 tells the server that there is a parameter
// definition and user parameters present. If this flag is
// not set the driver will ignore the additional parameters.
if (parameterized) {
scrollOpt |= CURSOR_TYPE_PARAMETERIZED;
}
return scrollOpt;
}
/**
* Translates a JDBC result set concurrency into SQL Server native @ccOpt
* value for use with stored procedures such as sp_cursoropen,
* sp_cursorprepare or sp_cursorprepexec.
*
* @param resultSetConcurrency JDBC result set concurrency (one of the
* <code>ResultSet.CONCUR_<i>XXX</i></code>
* values)
* @return a value for the @scrollOpt parameter
*/
static int getCursorConcurrencyOpt(int resultSetConcurrency) {
switch (resultSetConcurrency) {
case CONCUR_UPDATABLE:
return CURSOR_CONCUR_OPTIMISTIC;
case CONCUR_UPDATABLE + 1:
return CURSOR_CONCUR_SCROLL_LOCKS;
case CONCUR_UPDATABLE + 2:
return CURSOR_CONCUR_OPTIMISTIC_VALUES;
case CONCUR_READ_ONLY:
default:
return CURSOR_CONCUR_READ_ONLY;
}
}
/**
* Create a new Cursor result set using the internal sp_cursoropen procedure.
*
* @param sql The SQL SELECT statement.
* @param procName Optional procedure name for cursors based on a stored procedure.
* @param parameters Optional stored procedure parameters.
* @throws SQLException
*/
private void cursorCreate(String sql,
String procName,
ParamInfo[] parameters)
throws SQLException {
TdsCore tds = statement.getTds();
int prepareSql = statement.connection.getPrepareSql();
Integer prepStmtHandle = null;
//
// If this cursor is going to be a named forward only cursor
// force the concurrency to be updateable.
// TODO: Cursor is updateable unless user appends FOR READ to the select
// but we would need to parse the SQL to discover this.
//
if (cursorName != null
&& resultSetType == ResultSet.TYPE_FORWARD_ONLY
&& concurrency == ResultSet.CONCUR_READ_ONLY) {
concurrency = ResultSet.CONCUR_UPDATABLE;
}
//
// Simplify future tests for parameters
//
if (parameters != null && parameters.length == 0) {
parameters = null;
}
//
// SQL 6.5 does not support stored procs (with params) in the sp_cursor call
// will need to substitute any parameter values into the SQL.
//
if (tds.getTdsVersion() == Driver.TDS42) {
prepareSql = TdsCore.UNPREPARED;
if (parameters != null) {
procName = null;
}
}
//
// If we are running in unprepare mode and there are parameters
// substitute these into the SQL statement now.
//
if (parameters != null && prepareSql == TdsCore.UNPREPARED) {
sql = Support.substituteParameters(sql, parameters, statement.connection);
parameters = null;
}
//
// For most prepare modes we need to substitute parameter
// names for the ? markers.
//
if (parameters != null) {
if (procName == null || !procName.startsWith("#jtds")) {
sql = Support.substituteParamMarkers(sql, parameters);
}
}
//
// There are generally three situations in which procName is not null:
// 1. Running in prepareSQL=1 and contains a temp proc name e.g. #jtds00001
// in which case we need to generate an SQL statement exec #jtds...
// 2. Running in prepareSQL=4 and contains an existing statement handle.
// 3. CallableStatement in which case the SQL string has a valid exec
// statement and we can ignore procName.
//
if (procName != null) {
if (procName.startsWith("#jtds")) {
StringBuilder buf = new StringBuilder(procName.length() + 16
+ (parameters != null ? parameters.length * 5 : 0));
buf.append("EXEC ").append(procName).append(' ');
for (int i = 0; parameters != null && i < parameters.length; i++) {
if (i != 0) {
buf.append(',');
}
if (parameters[i].name != null) {
buf.append(parameters[i].name);
} else {
buf.append("@P").append(i);
}
}
sql = buf.toString();
} else if (TdsCore.isPreparedProcedureName(procName)) {
//
// Prepared Statement Handle
// At present procName is set to the value obtained by
// the connection.prepareSQL() call in JtdsPreparedStatement.
// This handle was obtained using sp_cursorprepare not sp_prepare
// so it's ok to use here.
//
try {
prepStmtHandle = new Integer(procName);
} catch (NumberFormatException e) {
throw new IllegalStateException(
"Invalid prepared statement handle: " +
procName);
}
}
}
//
// Select the correct type of Server side cursor to
// match the scroll and concurrency options.
//
int scrollOpt = getCursorScrollOpt(resultSetType, concurrency,
parameters != null);
int ccOpt = getCursorConcurrencyOpt(concurrency);
//
// Create parameter objects
//
// Setup scroll options parameter
//
ParamInfo pScrollOpt = new ParamInfo(Types.INTEGER, new Integer(scrollOpt), ParamInfo.OUTPUT);
//
// Setup concurrency options parameter
//
ParamInfo pConCurOpt = new ParamInfo(Types.INTEGER, new Integer(ccOpt), ParamInfo.OUTPUT);
//
// Setup number of rows parameter
//
ParamInfo pRowCount = new ParamInfo(Types.INTEGER, new Integer(fetchSize), ParamInfo.OUTPUT);
//
// Setup cursor handle parameter
//
ParamInfo pCursor = new ParamInfo(Types.INTEGER, null, ParamInfo.OUTPUT);
//
// Setup statement handle param
//
ParamInfo pStmtHand = null;
if (prepareSql == TdsCore.PREPARE) {
pStmtHand = new ParamInfo(Types.INTEGER, prepStmtHandle, ParamInfo.OUTPUT);
}
//
// Setup parameter definitions parameter
//
ParamInfo pParamDef = null;
if (parameters != null ) {
// Parameter declarations
for (int i = 0; i < parameters.length; i++) {
TdsData.getNativeType(statement.connection, parameters[i]);
}
pParamDef = new ParamInfo(Types.LONGVARCHAR,
Support.getParameterDefinitions(parameters),
ParamInfo.UNICODE);
}
//
// Setup SQL statement parameter
//
ParamInfo pSQL = new ParamInfo(Types.LONGVARCHAR, sql, ParamInfo.UNICODE);
//
// OK now open the Cursor
//
if (prepareSql == TdsCore.PREPARE && prepStmtHandle != null) {
// Use sp_cursorexecute approach
procName = "sp_cursorexecute";
if (parameters == null) {
parameters = new ParamInfo[5];
} else {
ParamInfo[] params = new ParamInfo[5 + parameters.length];
System.arraycopy(parameters, 0, params, 5, parameters.length);
parameters = params;
}
// Setup statement handle param
pStmtHand.isOutput = false;
pStmtHand.value = prepStmtHandle;
parameters[0] = pStmtHand;
// Setup cursor handle param
parameters[1] = pCursor;
// Setup scroll options (mask off parameter flag)
pScrollOpt.value = new Integer(scrollOpt & ~CURSOR_TYPE_PARAMETERIZED);
} else {
// Use sp_cursoropen approach
procName = "sp_cursoropen";
if (parameters == null) {
parameters = new ParamInfo[5];
} else {
ParamInfo[] params = new ParamInfo[6 + parameters.length];
System.arraycopy(parameters, 0, params, 6, parameters.length);
parameters = params;
parameters[5] = pParamDef;
}
// Setup cursor handle param
parameters[0] = pCursor;
// Setup statement param
parameters[1] = pSQL;
}
// Setup scroll options
parameters[2] = pScrollOpt;
// Setup concurrency options
parameters[3] = pConCurOpt;
// Setup numRows parameter
parameters[4] = pRowCount;
tds.executeSQL(null, procName, parameters, false,
statement.getQueryTimeout(), statement.getMaxRows(),
statement.getMaxFieldSize(), true);
// Load column meta data and any eventual rows (fast forward cursors)
processOutput(tds, true);
if ((scrollOpt & CURSOR_TYPE_AUTO_FETCH) != 0) {
// If autofetching, the cursor position is on the first row
cursorPos = 1;
}
// Check the return value
Integer retVal = tds.getReturnStatus();
if ((retVal == null) || (retVal.intValue() != 0 && retVal.intValue() != 2)) {
throw new SQLException(Messages.get("error.resultset.openfail"), "24000");
}
// Cursor is being built asynchronously so rowsInResult is not set
asyncCursor = (retVal.intValue() == 2);
//
// Retrieve values of output parameters
//
PARAM_CURSOR_HANDLE.value = pCursor.getOutValue();
int actualScroll = ((Integer) pScrollOpt.getOutValue()).intValue();
int actualCc = ((Integer) pConCurOpt.getOutValue()).intValue();
rowsInResult = ((Integer) pRowCount.getOutValue()).intValue();
//
// Set the cursor name if required allowing positioned updates.
// We need to do this here as any downgrade warnings will be wiped
// out by the executeSQL call.
//
if (cursorName != null) {
ParamInfo params[] = new ParamInfo[3];
params[0] = PARAM_CURSOR_HANDLE;
PARAM_OPTYPE.value = new Integer(2);
params[1] = PARAM_OPTYPE;
params[2] = new ParamInfo(Types.VARCHAR, cursorName, ParamInfo.UNICODE);
tds.executeSQL(null, "sp_cursoroption", params, true, 0, -1, -1, true);
tds.clearResponseQueue();
if (tds.getReturnStatus().intValue() != 0) {
statement.getMessages().addException(
new SQLException(Messages.get("error.resultset.openfail"), "24000"));
}
statement.getMessages().checkErrors();
}
//
// Check for downgrade of scroll or concurrency options
//
if ((actualScroll != (scrollOpt & 0xFFF)) || (actualCc != ccOpt)) {
boolean downgradeWarning = false;
if (actualScroll != scrollOpt) {
int resultSetType;
switch (actualScroll) {
case CURSOR_TYPE_FORWARD:
case CURSOR_TYPE_FASTFORWARDONLY:
resultSetType = TYPE_FORWARD_ONLY;
break;
case CURSOR_TYPE_STATIC:
resultSetType = TYPE_SCROLL_INSENSITIVE;
break;
case CURSOR_TYPE_KEYSET:
resultSetType = TYPE_SCROLL_SENSITIVE;
break;
case CURSOR_TYPE_DYNAMIC:
resultSetType = TYPE_SCROLL_SENSITIVE + 1;
break;
default:
resultSetType = this.resultSetType;
statement.getMessages().addWarning(new SQLWarning(
Messages.get("warning.cursortype", Integer.toString(actualScroll)),
"01000"));
}
downgradeWarning = resultSetType < this.resultSetType;
this.resultSetType = resultSetType;
}
if (actualCc != ccOpt) {
int concurrency;
switch (actualCc) {
case CURSOR_CONCUR_READ_ONLY:
concurrency = CONCUR_READ_ONLY;
break;
case CURSOR_CONCUR_OPTIMISTIC:
concurrency = CONCUR_UPDATABLE;
break;
case CURSOR_CONCUR_SCROLL_LOCKS:
concurrency = CONCUR_UPDATABLE + 1;
break;
case CURSOR_CONCUR_OPTIMISTIC_VALUES:
concurrency = CONCUR_UPDATABLE + 2;
break;
default:
concurrency = this.concurrency;
statement.getMessages().addWarning(new SQLWarning(
Messages.get("warning.concurrtype", Integer.toString(actualCc)),
"01000"));
}
downgradeWarning = concurrency < this.concurrency;
this.concurrency = concurrency;
}
if (downgradeWarning) {
// SAfe This warning goes to the Statement, not the ResultSet
statement.addWarning(new SQLWarning(
Messages.get( "warning.cursordowngraded",
resultSetType + "/" + concurrency),
"01000"));
}
}
}
/**
* Fetch the next result row from a cursor using the internal sp_cursorfetch procedure.
*
* @param fetchType The type of fetch eg FETCH_ABSOLUTE.
* @param rowNum The row number to fetch.
* @return <code>boolean</code> true if a result set row is returned.
* @throws SQLException
*/
private boolean cursorFetch(Integer fetchType, int rowNum)
throws SQLException {
TdsCore tds = statement.getTds();
statement.clearWarnings();
if (fetchType != FETCH_ABSOLUTE && fetchType != FETCH_RELATIVE) {
rowNum = 1;
}
ParamInfo[] param = new ParamInfo[4];
// Setup cursor handle param
param[0] = PARAM_CURSOR_HANDLE;
// Setup fetchtype param
PARAM_FETCHTYPE.value = fetchType;
param[1] = PARAM_FETCHTYPE;
// Setup rownum
PARAM_ROWNUM_IN.value = new Integer(rowNum);
param[2] = PARAM_ROWNUM_IN;
// Setup numRows parameter
if (((Integer) PARAM_NUMROWS_IN.value).intValue() != fetchSize) {
// If the fetch size changed, update the parameter and cache size
PARAM_NUMROWS_IN.value = new Integer(fetchSize);
rowCache = new Object[fetchSize][];
}
param[3] = PARAM_NUMROWS_IN;
synchronized (tds) {
// No meta data, no timeout (we're not sending it yet), no row
// limit, don't send yet
tds.executeSQL(null, "sp_cursorfetch", param, true, 0, 0,
statement.getMaxFieldSize(), false);
// Setup fetchtype param
PARAM_FETCHTYPE.value = FETCH_INFO;
param[1] = PARAM_FETCHTYPE;
// Setup rownum
PARAM_ROWNUM_OUT.clearOutValue();
param[2] = PARAM_ROWNUM_OUT;
// Setup numRows parameter
PARAM_NUMROWS_OUT.clearOutValue();
param[3] = PARAM_NUMROWS_OUT;
// No meta data, use the statement timeout, leave max rows as it is
// (no limit), leave max field size as it is, send now
tds.executeSQL(null, "sp_cursorfetch", param, true,
statement.getQueryTimeout(), -1, -1, true);
}
// Load rows
processOutput(tds, false);
cursorPos = ((Integer) PARAM_ROWNUM_OUT.getOutValue()).intValue();
if (fetchType != FETCH_REPEAT) {
// Do not change ResultSet position when refreshing
pos = cursorPos;
}
rowsInResult = ((Integer) PARAM_NUMROWS_OUT.getOutValue()).intValue();
if (rowsInResult < 0) {
// -1 = Dynamic cursor number of rows cannot be known.
// -n = Async cursor = rows loaded so far
rowsInResult = 0 - rowsInResult;
}
return getCurrentRow() != null;
}
/**
* Support general cursor operations such as delete, update etc.
*
* @param opType the type of operation to perform
* @param row the row number to update
* @throws SQLException
*/
private void cursor(Integer opType , ParamInfo[] row) throws SQLException {
TdsCore tds = statement.getTds();
statement.clearWarnings();
ParamInfo param[];
if (opType == CURSOR_OP_DELETE) {
// 3 parameters for delete
param = new ParamInfo[3];
} else {
if (row == null) {
throw new SQLException(Messages.get("error.resultset.update"), "24000");
}
// 4 parameters plus one for each column for insert/update
param = new ParamInfo[4 + columnCount];
}
// Setup cursor handle param
param[0] = PARAM_CURSOR_HANDLE;
// Setup optype param
PARAM_OPTYPE.value = opType;
param[1] = PARAM_OPTYPE;
// Setup rownum
PARAM_ROWNUM.value = new Integer(pos - cursorPos + 1);
param[2] = PARAM_ROWNUM;
// If row is not null, we're dealing with an insert/update
if (row != null) {
// Setup table
param[3] = PARAM_TABLE;
int colCnt = columnCount;
// Current column; we will only update/insert columns for which
// values were specified
int crtCol = 4;
// Name of the table to insert default values into (if necessary)
String tableName = null;
for (int i = 0; i < colCnt; i++) {
ParamInfo pi = row[i];
ColInfo col = columns[i];
if (pi != null && pi.isSet) {
if (!col.isWriteable) {
// Column is read-only but was updated
throw new SQLException(Messages.get("error.resultset.insert",
Integer.toString(i + 1), col.realName), "24000");
}
param[crtCol++] = pi;
}
if (tableName == null && col.tableName != null) {
if (col.catalog != null || col.schema != null) {
tableName = (col.catalog != null ? col.catalog : "")
+ '.' + (col.schema != null ? col.schema : "")
+ '.' + col.tableName;
} else {
tableName = col.tableName;
}
}
}
if (crtCol == 4) {
if (opType == CURSOR_OP_INSERT) {
// Insert default values for all columns.
// There seem to be two forms of sp_cursor: one with
// parameter names and values and one w/o names and with
// expressions (this is where 'default' comes in).
param[crtCol] = new ParamInfo(Types.VARCHAR,
"insert " + tableName + " default values",
ParamInfo.UNICODE);
crtCol++;
} else {
// No column to update so bail out!
return;
}
}
// If the count is different (i.e. there were read-only
// columns) reallocate the parameters into a shorter array
if (crtCol != colCnt + 4) {
ParamInfo[] newParam = new ParamInfo[crtCol];
System.arraycopy(param, 0, newParam, 0, crtCol);
param = newParam;
}
}
synchronized (tds) {
// With meta data (we're not expecting any ResultSets), no timeout
// (because we're not sending the request yet), don't alter max
// rows, don't alter max field size, don't send yet
tds.executeSQL(null, "sp_cursor", param, false, 0, -1, -1, false);
if (param.length != 4) {
param = new ParamInfo[4];
param[0] = PARAM_CURSOR_HANDLE;
}
// Setup fetchtype param
PARAM_FETCHTYPE.value = FETCH_INFO;
param[1] = PARAM_FETCHTYPE;
// Setup rownum
PARAM_ROWNUM_OUT.clearOutValue();
param[2] = PARAM_ROWNUM_OUT;
// Setup numRows parameter
PARAM_NUMROWS_OUT.clearOutValue();
param[3] = PARAM_NUMROWS_OUT;
// No meta data (no ResultSets expected), use statement timeout,
// don't alter max rows, don't alter max field size, send now
tds.executeSQL(null, "sp_cursorfetch", param, true,
statement.getQueryTimeout(), -1, -1, true);
}
// Consume the sp_cursor response
tds.consumeOneResponse();
statement.getMessages().checkErrors();
Integer retVal = tds.getReturnStatus();
if (retVal.intValue() != 0) {
throw new SQLException(Messages.get("error.resultset.cursorfail"),
"24000");
}
//
// Allow row values to be garbage collected
//
if (row != null) {
for (int i = 0; i < row.length; i++) {
if (row[i] != null) {
row[i].clearInValue();
}
}
}
// Consume the sp_cursorfetch response
tds.clearResponseQueue();
statement.getMessages().checkErrors();
cursorPos = ((Integer) PARAM_ROWNUM_OUT.getOutValue()).intValue();
rowsInResult = ((Integer) PARAM_NUMROWS_OUT.getOutValue()).intValue();
// Update row status
if (opType == CURSOR_OP_DELETE || opType == CURSOR_OP_UPDATE) {
Object[] currentRow = getCurrentRow();
if (currentRow == null) {
throw new SQLException(
Messages.get("error.resultset.updatefail"), "24000");
}
// No need to re-fetch the row, just mark it as deleted or dirty
currentRow[columns.length - 1] =
(opType == CURSOR_OP_DELETE) ? SQL_ROW_DELETED : SQL_ROW_DIRTY;
}
}
/**
* Close a server side cursor.
*
* @throws SQLException
*/
private void cursorClose() throws SQLException {
TdsCore tds = statement.getTds();
statement.clearWarnings();
// Consume rest of output and remember any exceptions
tds.clearResponseQueue();
SQLException ex = statement.getMessages().exceptions;
ParamInfo param[] = new ParamInfo[1];
// Setup cursor handle param
param[0] = PARAM_CURSOR_HANDLE;
tds.executeSQL(null, "sp_cursorclose", param, false,
statement.getQueryTimeout(), -1, -1, true);
tds.clearResponseQueue();
if (ex != null) {
ex.setNextException(statement.getMessages().exceptions);
throw ex;
} else {
statement.getMessages().checkErrors();
}
}
/**
* Processes the output of a cursor open or fetch operation. Fetches a
* batch of rows from the <code>TdsCore</code>, loading them into the row
* cache and optionally sets the column meta data (if called on cursor
* open). Consumes all the response and checks for server returned errors.
*
* @param tds the <code>TdsCore</code> instance
* @param setMeta whether column meta data needs to be loaded (cursor open)
* @throws SQLException if an error occurs or an error message is returned
* by the server
*/
private void processOutput(TdsCore tds, boolean setMeta) throws SQLException {
while (!tds.getMoreResults() && !tds.isEndOfResponse());
int i = 0;
if (tds.isResultSet()) {
// Set column meta data if necessary
if (setMeta) {
columns = copyInfo(tds.getColumns());
columnCount = getColumnCount(columns);
}
// With TDS 7 the data row (if any) is sent without any
// preceding resultset header.
// With TDS 8 there is a dummy result set header first
// then the data. This case also used if meta data not supressed.
if (tds.isRowData() || tds.getNextRow()) {
do {
rowCache[i++] = copyRow(tds.getRowData());
} while (tds.getNextRow());
}
} else if (setMeta) {
statement.getMessages().addException(new SQLException(
Messages.get("error.statement.noresult"), "24000"));
}
// Set the rest of the rows to null
for (; i < rowCache.length; ++i) {
rowCache[i] = null;
}
tds.clearResponseQueue();
statement.messages.checkErrors();
}
//
// -------------------- java.sql.ResultSet methods -------------------
//
public void afterLast() throws SQLException {
checkOpen();
checkScrollable();
if (pos != POS_AFTER_LAST) {
// SAfe Just fetch a very large absolute value
cursorFetch(FETCH_ABSOLUTE, Integer.MAX_VALUE);
}
}
public void beforeFirst() throws SQLException {
checkOpen();
checkScrollable();
if (pos != POS_BEFORE_FIRST) {
cursorFetch(FETCH_ABSOLUTE, 0);
}
}
public void cancelRowUpdates() throws SQLException {
checkOpen();
checkUpdateable();
if (onInsertRow) {
throw new SQLException(Messages.get("error.resultset.insrow"), "24000");
}
for (int i = 0; updateRow != null && i < updateRow.length; i++) {
if (updateRow[i] != null) {
updateRow[i].clearInValue();
}
}
}
public void close() throws SQLException {
if (!closed) {
try {
if (!statement.getConnection().isClosed()) {
cursorClose();
}
} finally {
closed = true;
statement = null;
}
}
}
public void deleteRow() throws SQLException {
checkOpen();
checkUpdateable();
if (getCurrentRow() == null) {
throw new SQLException(Messages.get("error.resultset.norow"), "24000");
}
if (onInsertRow) {
throw new SQLException(Messages.get("error.resultset.insrow"), "24000");
}
cursor(CURSOR_OP_DELETE, null);
}
public void insertRow() throws SQLException {
checkOpen();
checkUpdateable();
if (!onInsertRow) {
throw new SQLException(Messages.get("error.resultset.notinsrow"), "24000");
}
cursor(CURSOR_OP_INSERT, insertRow);
}
public void moveToCurrentRow() throws SQLException {
checkOpen();
checkUpdateable();
onInsertRow = false;
}
public void moveToInsertRow() throws SQLException {
checkOpen();
checkUpdateable();
if (insertRow == null) {
insertRow = new ParamInfo[columnCount];
}
onInsertRow = true;
}
public void refreshRow() throws SQLException {
checkOpen();
if (onInsertRow) {
throw new SQLException(Messages.get("error.resultset.insrow"), "24000");
}
cursorFetch(FETCH_REPEAT, 0);
}
public void updateRow() throws SQLException {
checkOpen();
checkUpdateable();
if (getCurrentRow() == null) {
throw new SQLException(Messages.get("error.resultset.norow"), "24000");
}
if (onInsertRow) {
throw new SQLException(Messages.get("error.resultset.insrow"), "24000");
}
if (updateRow != null) {
cursor(CURSOR_OP_UPDATE, updateRow);
}
}
public boolean first() throws SQLException {
checkOpen();
checkScrollable();
pos = 1;
if (getCurrentRow() == null) {
return cursorFetch(FETCH_FIRST, 0);
} else {
return true;
}
}
// FIXME Make the isXXX() methods work with forward-only cursors (rowsInResult == -1)
public boolean isLast() throws SQLException {
checkOpen();
return(pos == rowsInResult) && (rowsInResult != 0);
}
public boolean last() throws SQLException {
checkOpen();
checkScrollable();
pos = rowsInResult;
if (asyncCursor || getCurrentRow() == null) {
if (cursorFetch(FETCH_LAST, 0)) {
// Set pos to the last row, as the number of rows can change
pos = rowsInResult;
return true;
} else {
return false;
}
} else {
return true;
}
}
public boolean next() throws SQLException {
checkOpen();
++pos;
if (getCurrentRow() == null) {
return cursorFetch(FETCH_NEXT, 0);
} else {
return true;
}
}
public boolean previous() throws SQLException {
checkOpen();
checkScrollable();
// Don't bother if we're already before the first row
if (pos == POS_BEFORE_FIRST) {
return false;
}
// Save current ResultSet position
int initPos = pos;
// Decrement current position
--pos;
if (initPos == POS_AFTER_LAST || getCurrentRow() == null) {
boolean res = cursorFetch(FETCH_PREVIOUS, 0);
pos = (initPos == POS_AFTER_LAST) ? rowsInResult : (initPos - 1);
return res;
} else {
return true;
}
}
public boolean rowDeleted() throws SQLException {
checkOpen();
Object[] currentRow = getCurrentRow();
// If there is no current row, return false (the row was not deleted)
if (currentRow == null) {
return false;
}
// Reload if dirty
if (SQL_ROW_DIRTY.equals(currentRow[columns.length - 1])) {
cursorFetch(FETCH_REPEAT, 0);
currentRow = getCurrentRow();
}
return SQL_ROW_DELETED.equals(currentRow[columns.length - 1]);
}
public boolean rowInserted() throws SQLException {
checkOpen();
// No way to find out
return false;
}
public boolean rowUpdated() throws SQLException {
checkOpen();
// No way to find out
return false;
}
public boolean absolute(int row) throws SQLException {
checkOpen();
checkScrollable();
pos = (row >= 0) ? row : (rowsInResult - row + 1);
if (getCurrentRow() == null) {
boolean result = cursorFetch(FETCH_ABSOLUTE, row);
if (cursorPos == 1 && row + rowsInResult < 0) {
pos = 0;
result = false;
}
return result;
} else {
return true;
}
}
public boolean relative(int row) throws SQLException {
checkOpen();
checkScrollable();
pos = (pos == POS_AFTER_LAST) ? (rowsInResult + 1 + row) : (pos + row);
if (getCurrentRow() == null) {
if (pos < cursorPos) {
// If fetching backwards fetch the row and the rows before it,
// then restore pos
int savePos = pos;
boolean result = cursorFetch(FETCH_RELATIVE,
pos - cursorPos - fetchSize + 1);
if (result) {
pos = savePos;
} else {
pos = POS_BEFORE_FIRST;
}
return result;
} else {
return cursorFetch(FETCH_RELATIVE, pos - cursorPos);
}
} else {
return true;
}
}
protected Object[] getCurrentRow() {
if (pos < cursorPos || pos >= cursorPos + rowCache.length) {
return null;
}
return rowCache[pos - cursorPos];
}
}
⏎ net/sourceforge/jtds/jdbc/MSCursorResultSet.java
Or download all of them as a single archive file:
File name: jtds-1.3.1-fyi.zip File size: 323160 bytes Release date: 2013-06-08 Download
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