/*
* Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.jdbc;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.Statement;
import java.util.ArrayList;
import org.h2.api.ErrorCode;
import org.h2.command.CommandInterface;
import org.h2.engine.SessionInterface;
import org.h2.engine.SysProperties;
import org.h2.message.DbException;
import org.h2.message.TraceObject;
import org.h2.result.ResultInterface;
import org.h2.util.New;
/**
* Represents a statement.
*/
public class JdbcStatement extends TraceObject implements Statement, JdbcStatementBackwardsCompat {
protected JdbcConnection conn;
protected SessionInterface session;
protected JdbcResultSet resultSet;
protected int maxRows;
protected int fetchSize = SysProperties.SERVER_RESULT_SET_FETCH_SIZE;
protected int updateCount;
protected final int resultSetType;
protected final int resultSetConcurrency;
protected final boolean closedByResultSet;
private CommandInterface executingCommand;
private int lastExecutedCommandType;
private ArrayList<String> batchCommands;
private boolean escapeProcessing = true;
private boolean cancelled;
JdbcStatement(JdbcConnection conn, int id, int resultSetType,
int resultSetConcurrency, boolean closeWithResultSet) {
this.conn = conn;
this.session = conn.getSession();
setTrace(session.getTrace(), TraceObject.STATEMENT, id);
this.resultSetType = resultSetType;
this.resultSetConcurrency = resultSetConcurrency;
//只在org.h2.jdbc.JdbcConnection.prepareAutoCloseStatement(String)中设为true，意思是由ResultSet自己关闭
this.closedByResultSet = closeWithResultSet;
}
/**
* Executes a query (select statement) and returns the result set.
* If another result set exists for this statement, this will be closed
* (even if this statement fails).
*
* @param sql the SQL statement to execute
* @return the result set
*/
@Override
public ResultSet executeQuery(String sql) throws SQLException {
try {
//这个id用处不大，仅用于跟踪
//org.h2.command.CommandRemote.executeQuery(int, boolean)中生成的objectId用于关联结果集，
//objectId在查询时先发给server端，server用objectId对应server端的结果集，
//同时objectId被放到ResultRemote中，然后这个ResultRemote又放到JdbcResultSet中，
//当JdbcResultSet下一次要获取更多记录时，会把此objectId再发到server端，这样就可以继续获取后续记录了�?
int id = getNextId(TraceObject.RESULT_SET);
if (isDebugEnabled()) {
debugCodeAssign("ResultSet", TraceObject.RESULT_SET, id,
"executeQuery(" + quote(sql) + ")");
}
synchronized (session) {
checkClosed();
closeOldResultSet();
sql = JdbcConnection.translateSQL(sql, escapeProcessing);
CommandInterface command = conn.prepareCommand(sql, fetchSize);
ResultInterface result;
boolean scrollable = resultSetType != ResultSet.TYPE_FORWARD_ONLY;
boolean updatable = resultSetConcurrency == ResultSet.CONCUR_UPDATABLE;
setExecutingStatement(command);
try {
result = command.executeQuery(maxRows, scrollable);
} finally {
setExecutingStatement(null);
}
command.close();
resultSet = new JdbcResultSet(conn, this, result, id,
closedByResultSet, scrollable, updatable);
}
return resultSet;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Executes a statement (insert, update, delete, create, drop)
* and returns the update count.
* If another result set exists for this statement, this will be closed
* (even if this statement fails).
*
* If auto commit is on, this statement will be committed.
* If the statement is a DDL statement (create, drop, alter) and does not
* throw an exception, the current transaction (if any) is committed after
* executing the statement.
*
* @param sql the SQL statement
* @return the update count (number of row affected by an insert,
* update or delete, or 0 if no rows or the statement was a
* create, drop, commit or rollback)
* @throws SQLException if a database error occurred or a
* select statement was executed
*/
@Override
public int executeUpdate(String sql) throws SQLException {
try {
debugCodeCall("executeUpdate", sql);
return executeUpdateInternal(sql);
} catch (Exception e) {
throw logAndConvert(e);
}
}
private int executeUpdateInternal(String sql) throws SQLException {
checkClosedForWrite();
try {
closeOldResultSet();
sql = JdbcConnection.translateSQL(sql, escapeProcessing);
CommandInterface command = conn.prepareCommand(sql, fetchSize);
synchronized (session) {
setExecutingStatement(command);
try {
updateCount = command.executeUpdate();
} finally {
setExecutingStatement(null);
}
}
command.close();
return updateCount;
} finally {
afterWriting(); //因为在checkClosedForWrite中有可能触发org.h2.engine.Database.beforeWriting()
}
}
/**
* Executes an arbitrary statement. If another result set exists for this
* statement, this will be closed (even if this statement fails).
*
* If the statement is a create or drop and does not throw an exception, the
* current transaction (if any) is committed after executing the statement.
* If auto commit is on, and the statement is not a select, this statement
* will be committed.
*
* @param sql the SQL statement to execute
* @return true if a result set is available, false if not
*/
@Override
public boolean execute(String sql) throws SQLException {
try {
debugCodeCall("execute", sql);
return executeInternal(sql);
} catch (Exception e) {
throw logAndConvert(e);
}
}
private boolean executeInternal(String sql) throws SQLException {
int id = getNextId(TraceObject.RESULT_SET);
checkClosedForWrite();
try {
closeOldResultSet();
sql = JdbcConnection.translateSQL(sql, escapeProcessing);
CommandInterface command = conn.prepareCommand(sql, fetchSize);
boolean returnsResultSet;
synchronized (session) {
setExecutingStatement(command);
try {
if (command.isQuery()) {
returnsResultSet = true;
boolean scrollable = resultSetType != ResultSet.TYPE_FORWARD_ONLY;
boolean updatable = resultSetConcurrency == ResultSet.CONCUR_UPDATABLE;
ResultInterface result = command.executeQuery(maxRows, scrollable);
resultSet = new JdbcResultSet(conn, this, result, id,
closedByResultSet, scrollable, updatable);
} else {
returnsResultSet = false;
updateCount = command.executeUpdate();
}
} finally {
setExecutingStatement(null);
}
}
command.close();
return returnsResultSet;
} finally {
afterWriting();
}
}
/**
* Returns the last result set produces by this statement.
*
* @return the result set
*/
@Override
public ResultSet getResultSet() throws SQLException {
try {
checkClosed();
if (resultSet != null) {
int id = resultSet.getTraceId();
debugCodeAssign("ResultSet", TraceObject.RESULT_SET, id, "getResultSet()");
} else {
debugCodeCall("getResultSet");
}
return resultSet;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Returns the last update count of this statement.
*
* @return the update count (number of row affected by an insert, update or
* delete, or 0 if no rows or the statement was a create, drop,
* commit or rollback; -1 if the statement was a select).
* @throws SQLException if this object is closed or invalid
*/
@Override
public int getUpdateCount() throws SQLException {
try {
debugCodeCall("getUpdateCount");
checkClosed();
return updateCount;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Closes this statement.
* All result sets that where created by this statement
* become invalid after calling this method.
*/
@Override
public void close() throws SQLException {
try {
debugCodeCall("close");
synchronized (session) {
closeOldResultSet();
if (conn != null) {
conn = null;
}
}
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Returns the connection that created this object.
*
* @return the connection
*/
@Override
public Connection getConnection() {
debugCodeCall("getConnection");
return conn;
}
/**
* Gets the first warning reported by calls on this object.
* This driver does not support warnings, and will always return null.
*
* @return null
*/
@Override
public SQLWarning getWarnings() throws SQLException {
try {
debugCodeCall("getWarnings");
checkClosed();
return null;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Clears all warnings. As this driver does not support warnings,
* this call is ignored.
*/
@Override
public void clearWarnings() throws SQLException {
try {
debugCodeCall("clearWarnings");
checkClosed();
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Sets the name of the cursor. This call is ignored.
*
* @param name ignored
* @throws SQLException if this object is closed
*/
@Override
public void setCursorName(String name) throws SQLException {
try {
debugCodeCall("setCursorName", name);
checkClosed();
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Sets the fetch direction.
* This call is ignored by this driver.
*
* @param direction ignored
* @throws SQLException if this object is closed
*/
@Override
public void setFetchDirection(int direction) throws SQLException {
try {
debugCodeCall("setFetchDirection", direction);
checkClosed();
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Gets the fetch direction.
*
* @return FETCH_FORWARD
* @throws SQLException if this object is closed
*/
@Override
public int getFetchDirection() throws SQLException {
try {
debugCodeCall("getFetchDirection");
checkClosed();
return ResultSet.FETCH_FORWARD;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Gets the maximum number of rows for a ResultSet.
*
* @return the number of rows where 0 means no limit
* @throws SQLException if this object is closed
*/
@Override
public int getMaxRows() throws SQLException {
try {
debugCodeCall("getMaxRows");
checkClosed();
return maxRows;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Gets the maximum number of rows for a ResultSet.
*
* @param maxRows the number of rows where 0 means no limit
* @throws SQLException if this object is closed
*/
@Override
public void setMaxRows(int maxRows) throws SQLException {
try {
debugCodeCall("setMaxRows", maxRows);
checkClosed();
if (maxRows < 0) {
throw DbException.getInvalidValueException("maxRows", maxRows);
}
this.maxRows = maxRows;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Sets the number of rows suggested to read in one step.
* This value cannot be higher than the maximum rows (setMaxRows)
* set by the statement or prepared statement, otherwise an exception
* is throws. Setting the value to 0 will set the default value.
* The default value can be changed using the system property
* h2.serverResultSetFetchSize.
*
* @param rows the number of rows
* @throws SQLException if this object is closed
*/
@Override
public void setFetchSize(int rows) throws SQLException {
try {
debugCodeCall("setFetchSize", rows);
checkClosed();
if (rows < 0 || (rows > 0 && maxRows > 0 && rows > maxRows)) {
throw DbException.getInvalidValueException("rows", rows);
}
if (rows == 0) {
rows = SysProperties.SERVER_RESULT_SET_FETCH_SIZE;
}
fetchSize = rows;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Gets the number of rows suggested to read in one step.
*
* @return the current fetch size
* @throws SQLException if this object is closed
*/
@Override
public int getFetchSize() throws SQLException {
try {
debugCodeCall("getFetchSize");
checkClosed();
return fetchSize;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Gets the result set concurrency created by this object.
*
* @return the concurrency
*/
@Override
public int getResultSetConcurrency() throws SQLException {
try {
debugCodeCall("getResultSetConcurrency");
checkClosed();
return resultSetConcurrency;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Gets the result set type.
*
* @return the type
* @throws SQLException if this object is closed
*/
@Override
public int getResultSetType() throws SQLException {
try {
debugCodeCall("getResultSetType");
checkClosed();
return resultSetType;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Gets the maximum number of bytes for a result set column.
*
* @return always 0 for no limit
* @throws SQLException if this object is closed
*/
@Override
public int getMaxFieldSize() throws SQLException {
try {
debugCodeCall("getMaxFieldSize");
checkClosed();
return 0;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Sets the maximum number of bytes for a result set column.
* This method does currently do nothing for this driver.
*
* @param max the maximum size - ignored
* @throws SQLException if this object is closed
*/
@Override
public void setMaxFieldSize(int max) throws SQLException {
try {
debugCodeCall("setMaxFieldSize", max);
checkClosed();
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Enables or disables processing or JDBC escape syntax.
* See also Connection.nativeSQL.
*
* @param enable - true (default) or false (no conversion is attempted)
* @throws SQLException if this object is closed
*/
@Override
public void setEscapeProcessing(boolean enable) throws SQLException {
try {
if (isDebugEnabled()) {
debugCode("setEscapeProcessing("+enable+");");
}
checkClosed();
escapeProcessing = enable;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Cancels a currently running statement.
* This method must be called from within another
* thread than the execute method.
* Operations on large objects are not interrupted,
* only operations that process many rows.
*
* @throws SQLException if this object is closed
*/
@Override
public void cancel() throws SQLException {
try {
debugCodeCall("cancel");
checkClosed();
// executingCommand can be reset by another thread
CommandInterface c = executingCommand;
try {
if (c != null) {
c.cancel();
cancelled = true;
}
} finally {
setExecutingStatement(null);
}
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Check whether the statement was cancelled.
*
* @return true if yes
*/
public boolean wasCancelled() {
return cancelled;
}
/**
* Gets the current query timeout in seconds.
* This method will return 0 if no query timeout is set.
* The result is rounded to the next second.
* For performance reasons, only the first call to this method
* will query the database. If the query timeout was changed in another
* way than calling setQueryTimeout, this method will always return
* the last value.
*
* @return the timeout in seconds
* @throws SQLException if this object is closed
*/
@Override
public int getQueryTimeout() throws SQLException {
try {
debugCodeCall("getQueryTimeout");
checkClosed();
return conn.getQueryTimeout();
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Sets the current query timeout in seconds.
* Changing the value will affect all statements of this connection.
* This method does not commit a transaction,
* and rolling back a transaction does not affect this setting.
*
* @param seconds the timeout in seconds - 0 means no timeout, values
* smaller 0 will throw an exception
* @throws SQLException if this object is closed
*/
@Override
public void setQueryTimeout(int seconds) throws SQLException {
try {
debugCodeCall("setQueryTimeout", seconds);
checkClosed();
if (seconds < 0) {
throw DbException.getInvalidValueException("seconds", seconds);
}
conn.setQueryTimeout(seconds);
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Adds a statement to the batch.
*
* @param sql the SQL statement
*/
@Override
public void addBatch(String sql) throws SQLException {
try {
debugCodeCall("addBatch", sql);
checkClosed();
sql = JdbcConnection.translateSQL(sql, escapeProcessing);
if (batchCommands == null) {
batchCommands = New.arrayList();
}
batchCommands.add(sql);
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Clears the batch.
*/
@Override
public void clearBatch() throws SQLException {
try {
debugCodeCall("clearBatch");
checkClosed();
batchCommands = null;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Executes the batch.
* If one of the batched statements fails, this database will continue.
*
* @return the array of update counts
*/
@Override
public int[] executeBatch() throws SQLException {
try {
debugCodeCall("executeBatch");
checkClosedForWrite();
try {
if (batchCommands == null) {
// TODO batch: check what other database do if no commands
// are set
batchCommands = New.arrayList();
}
int size = batchCommands.size();
int[] result = new int[size];
boolean error = false;
SQLException next = null;
for (int i = 0; i < size; i++) {
String sql = batchCommands.get(i);
try {
result[i] = executeUpdateInternal(sql);
} catch (Exception re) {
SQLException e = logAndConvert(re);
if (next == null) {
next = e;
} else {
e.setNextException(next);
next = e;
}
result[i] = Statement.EXECUTE_FAILED;
error = true;
}
}
batchCommands = null;
if (error) {
throw new JdbcBatchUpdateException(next, result);
}
return result;
} finally {
afterWriting();
}
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Return a result set that contains the last generated auto-increment key
* for this connection, if there was one. If no key was generated by the
* last modification statement, then an empty result set is returned.
* The returned result set only contains the data for the very last row.
*
* @return the result set with one row and one column containing the key
* @throws SQLException if this object is closed
*/
@Override
public ResultSet getGeneratedKeys() throws SQLException {
try {
int id = getNextId(TraceObject.RESULT_SET);
if (isDebugEnabled()) {
debugCodeAssign("ResultSet", TraceObject.RESULT_SET, id, "getGeneratedKeys()");
}
checkClosed();
return conn.getGeneratedKeys(this, id);
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Moves to the next result set - however there is always only one result
* set. This call also closes the current result set (if there is one).
* Returns true if there is a next result set (that means - it always
* returns false).
*
* @return false
* @throws SQLException if this object is closed.
*/
@Override
public boolean getMoreResults() throws SQLException {
try {
debugCodeCall("getMoreResults");
checkClosed();
closeOldResultSet();
return false;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Move to the next result set.
* This method always returns false.
*
* @param current Statement.CLOSE_CURRENT_RESULT,
* Statement.KEEP_CURRENT_RESULT,
* or Statement.CLOSE_ALL_RESULTS
* @return false
*/
@Override
public boolean getMoreResults(int current) throws SQLException {
try {
debugCodeCall("getMoreResults", current);
switch (current) {
case Statement.CLOSE_CURRENT_RESULT:
case Statement.CLOSE_ALL_RESULTS:
checkClosed();
closeOldResultSet();
break;
case Statement.KEEP_CURRENT_RESULT:
// nothing to do
break;
default:
throw DbException.getInvalidValueException("current", current);
}
return false;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Executes a statement and returns the update count.
* This method just calls executeUpdate(String sql) internally.
* The method getGeneratedKeys supports at most one columns and row.
*
* @param sql the SQL statement
* @param autoGeneratedKeys ignored
* @return the update count (number of row affected by an insert,
* update or delete, or 0 if no rows or the statement was a
* create, drop, commit or rollback)
* @throws SQLException if a database error occurred or a
* select statement was executed
*/
@Override
public int executeUpdate(String sql, int autoGeneratedKeys)
throws SQLException {
try {
if (isDebugEnabled()) {
debugCode("executeUpdate("+quote(sql)+", "+autoGeneratedKeys+");");
}
return executeUpdateInternal(sql);
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Executes a statement and returns the update count.
* This method just calls executeUpdate(String sql) internally.
* The method getGeneratedKeys supports at most one columns and row.
*
* @param sql the SQL statement
* @param columnIndexes ignored
* @return the update count (number of row affected by an insert,
* update or delete, or 0 if no rows or the statement was a
* create, drop, commit or rollback)
* @throws SQLException if a database error occurred or a
* select statement was executed
*/
@Override
public int executeUpdate(String sql, int[] columnIndexes) throws SQLException {
try {
if (isDebugEnabled()) {
debugCode("executeUpdate("+quote(sql)+", "+quoteIntArray(columnIndexes)+");");
}
return executeUpdateInternal(sql);
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Executes a statement and returns the update count.
* This method just calls executeUpdate(String sql) internally.
* The method getGeneratedKeys supports at most one columns and row.
*
* @param sql the SQL statement
* @param columnNames ignored
* @return the update count (number of row affected by an insert,
* update or delete, or 0 if no rows or the statement was a
* create, drop, commit or rollback)
* @throws SQLException if a database error occurred or a
* select statement was executed
*/
@Override
public int executeUpdate(String sql, String[] columnNames) throws SQLException {
try {
if (isDebugEnabled()) {
debugCode("executeUpdate("+quote(sql)+", "+quoteArray(columnNames)+");");
}
return executeUpdateInternal(sql);
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Executes a statement and returns the update count.
* This method just calls execute(String sql) internally.
* The method getGeneratedKeys supports at most one columns and row.
*
* @param sql the SQL statement
* @param autoGeneratedKeys ignored
* @return the update count (number of row affected by an insert,
* update or delete, or 0 if no rows or the statement was a
* create, drop, commit or rollback)
* @throws SQLException if a database error occurred or a
* select statement was executed
*/
@Override
public boolean execute(String sql, int autoGeneratedKeys) throws SQLException {
try {
if (isDebugEnabled()) {
debugCode("execute("+quote(sql)+", "+autoGeneratedKeys+");");
}
return executeInternal(sql);
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Executes a statement and returns the update count.
* This method just calls execute(String sql) internally.
* The method getGeneratedKeys supports at most one columns and row.
*
* @param sql the SQL statement
* @param columnIndexes ignored
* @return the update count (number of row affected by an insert,
* update or delete, or 0 if no rows or the statement was a
* create, drop, commit or rollback)
* @throws SQLException if a database error occurred or a
* select statement was executed
*/
@Override
public boolean execute(String sql, int[] columnIndexes) throws SQLException {
try {
if (isDebugEnabled()) {
debugCode("execute("+quote(sql)+", "+quoteIntArray(columnIndexes)+");");
}
return executeInternal(sql);
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Executes a statement and returns the update count.
* This method just calls execute(String sql) internally.
* The method getGeneratedKeys supports at most one columns and row.
*
* @param sql the SQL statement
* @param columnNames ignored
* @return the update count (number of row affected by an insert,
* update or delete, or 0 if no rows or the statement was a
* create, drop, commit or rollback)
* @throws SQLException if a database error occurred or a
* select statement was executed
*/
@Override
public boolean execute(String sql, String[] columnNames) throws SQLException {
try {
if (isDebugEnabled()) {
debugCode("execute("+quote(sql)+", "+quoteArray(columnNames)+");");
}
return executeInternal(sql);
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Gets the result set holdability.
*
* @return the holdability
*/
@Override
public int getResultSetHoldability() throws SQLException {
try {
debugCodeCall("getResultSetHoldability");
checkClosed();
return ResultSet.HOLD_CURSORS_OVER_COMMIT;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* [Not supported]
*/
@Override
public void closeOnCompletion() {
// not supported
}
/**
* [Not supported]
*/
@Override
public boolean isCloseOnCompletion() {
return true;
}
// =============================================================
/**
* Check if this connection is closed.
* The next operation is a read request.
*
* @return true if the session was re-connected
* @throws DbException if the connection or session is closed
*/
boolean checkClosed() {
return checkClosed(false);
}
/**
* Check if this connection is closed.
* The next operation may be a write request.
*
* @return true if the session was re-connected
* @throws DbException if the connection or session is closed
*/
boolean checkClosedForWrite() {
return checkClosed(true);
}
/**
* INTERNAL.
* Check if the statement is closed.
*
* @param write if the next operation is possibly writing
* @return true if a reconnect was required
* @throws DbException if it is closed
*/
protected boolean checkClosed(boolean write) {
if (conn == null) {
throw DbException.get(ErrorCode.OBJECT_CLOSED);
}
conn.checkClosed(write);
SessionInterface s = conn.getSession();
if (s != session) {
session = s;
trace = session.getTrace();
return true;
}
return false;
}
/**
* Called after each write operation.
*/
void afterWriting() {
if (conn != null) {
conn.afterWriting();
}
}
/**
* INTERNAL.
* Close and old result set if there is still one open.
*/
protected void closeOldResultSet() throws SQLException {
try {
if (!closedByResultSet) {
if (resultSet != null) {
resultSet.closeInternal();
}
}
} finally {
cancelled = false;
resultSet = null;
updateCount = -1;
}
}
/**
* INTERNAL.
* Set the statement that is currently running.
*
* @param c the command
*/
protected void setExecutingStatement(CommandInterface c) {
if (c == null) {
conn.setExecutingStatement(null);
} else {
conn.setExecutingStatement(this);
lastExecutedCommandType = c.getCommandType();
}
executingCommand = c;
}
/**
* INTERNAL.
* Get the command type of the last executed command.
*/
public int getLastExecutedCommandType() {
return lastExecutedCommandType;
}
/**
* Returns whether this statement is closed.
*
* @return true if the statement is closed
*/
@Override
public boolean isClosed() throws SQLException {
try {
debugCodeCall("isClosed");
return conn == null;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Return an object of this class if possible.
*
* @param iface the class
* @return this
*/
@Override
@SuppressWarnings("unchecked")
public <T> T unwrap(Class<T> iface) throws SQLException {
try {
if (isWrapperFor(iface)) {
return (T) this;
}
throw DbException.getInvalidValueException("iface", iface);
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Checks if unwrap can return an object of this class.
*
* @param iface the class
* @return whether or not the interface is assignable from this class
*/
@Override
public boolean isWrapperFor(Class<?> iface) throws SQLException {
return iface != null && iface.isAssignableFrom(getClass());
}
/**
* Returns whether this object is poolable.
* @return false
*/
@Override
public boolean isPoolable() {
debugCodeCall("isPoolable");
return false;
}
/**
* Requests that this object should be pooled or not.
* This call is ignored.
*
* @param poolable the requested value
*/
@Override
public void setPoolable(boolean poolable) {
if (isDebugEnabled()) {
debugCode("setPoolable("+poolable+");");
}
}
/**
* INTERNAL
*/
@Override
public String toString() {
return getTraceObjectName();
}
}