/*-------------------------------------------------------------------------
*
* Copyright (c) 2004-2008, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgjdbc/org/postgresql/jdbc2/AbstractJdbc2Connection.java,v 1.55 2010/05/01 14:40:51 jurka Exp $
*
*-------------------------------------------------------------------------
*/
package org.postgresql.jdbc2;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import java.util.*;
import org.postgresql.core.*;
import org.postgresql.Driver;
import org.postgresql.PGNotification;
import org.postgresql.fastpath.Fastpath;
import org.postgresql.largeobject.LargeObjectManager;
import org.postgresql.util.PSQLState;
import org.postgresql.util.PGobject;
import org.postgresql.util.PSQLException;
import org.postgresql.util.GT;
import org.postgresql.copy.*;
/**
* This class defines methods of the jdbc2 specification.
* The real Connection class (for jdbc2) is org.postgresql.jdbc2.Jdbc2Connection
*/
public abstract class AbstractJdbc2Connection implements BaseConnection
{
private static my.Debug DEBUG=new my.Debug(my.Debug.AbstractJdbc2Connection);//我加上的
//
// Driver-wide connection ID counter, used for logging
//
private static int nextConnectionID = 1;
//
// Data initialized on construction:
//
// Per-connection logger
private final Logger logger;
/* URL we were created via */
private final String creatingURL;
private Throwable openStackTrace;
/* Actual network handler */
private final ProtocolConnection protoConnection;
/* Compatibility version */
private final String compatible;
/* Actual server version */
private final String dbVersionNumber;
/* Query that runs COMMIT */
private final Query commitQuery;
/* Query that runs ROLLBACK */
private final Query rollbackQuery;
private TypeInfo _typeCache;
// Default statement prepare threshold.
protected int prepareThreshold; //在构造函数中默认设为5
// Connection's autocommit state.
public boolean autoCommit = true;
// Connection's readonly state.
public boolean readOnly = false;
// Bind String to UNSPECIFIED or VARCHAR?
public final boolean bindStringAsVarchar;
// Current warnings; there might be more on protoConnection too.
public SQLWarning firstWarning = null;
public abstract DatabaseMetaData getMetaData() throws SQLException;
//
// Ctor.
//
protected AbstractJdbc2Connection(String host, int port, String user, String database, Properties info, String url) throws SQLException
{
try {//我加上的
DEBUG.P(this,"AbstractJdbc2Connection(6)");
DEBUG.P("host="+host);
DEBUG.P("port="+port);
DEBUG.P("user="+user);
DEBUG.P("database="+database);
DEBUG.P("info="+info);
DEBUG.P("url="+url);
this.creatingURL = url;
// Read loglevel arg and set the loglevel based on this value;
// In addition to setting the log level, enable output to
// standard out if no other printwriter is set
int logLevel = Driver.getLogLevel();
String connectionLogLevel = info.getProperty("loglevel");
if (connectionLogLevel != null) {
try {
logLevel = Integer.parseInt(connectionLogLevel);
} catch (Exception l_e) {
// XXX revisit
// invalid value for loglevel; ignore it
}
}
synchronized (AbstractJdbc2Connection.class) {
logger = new Logger(nextConnectionID++);
logger.setLogLevel(logLevel);
}
DEBUG.P("logLevel="+logLevel);
if (logLevel > 0)
enableDriverManagerLogging();
prepareThreshold = 5;
try
{
prepareThreshold = Integer.parseInt(info.getProperty("prepareThreshold", "5"));
DEBUG.P("prepareThreshold="+prepareThreshold);
if (prepareThreshold < 0)
prepareThreshold = 0;
}
catch (Exception e)
{
}
//Print out the driver version number
if (logger.logInfo())
logger.info(Driver.getVersion());
// Now make the initial connection and set up local state
this.protoConnection = ConnectionFactory.openConnection(host, port, user, database, info, logger);
this.dbVersionNumber = protoConnection.getServerVersion();
this.compatible = info.getProperty("compatible", Driver.MAJORVERSION + "." + Driver.MINORVERSION);
DEBUG.P("dbVersionNumber="+dbVersionNumber);
if (logger.logDebug())
{
logger.debug(" compatible = " + compatible);
logger.debug(" loglevel = " + logLevel);
logger.debug(" prepare threshold = " + prepareThreshold);
}
//
// String -> text or unknown?
//
String stringType = info.getProperty("stringtype");
if (stringType != null) {
if (stringType.equalsIgnoreCase("unspecified"))
bindStringAsVarchar = false;
else if (stringType.equalsIgnoreCase("varchar"))
bindStringAsVarchar = true;
else
throw new PSQLException(GT.tr("Unsupported value for stringtype parameter: {0}", stringType),
PSQLState.INVALID_PARAMETER_VALUE);
} else {
bindStringAsVarchar = haveMinimumCompatibleVersion("8.0");
}
// Initialize timestamp stuff
timestampUtils = new TimestampUtils(haveMinimumServerVersion("7.4"), haveMinimumServerVersion("8.2"));
// Initialize common queries.
commitQuery = getQueryExecutor().createSimpleQuery("COMMIT");
rollbackQuery = getQueryExecutor().createSimpleQuery("ROLLBACK");
int unknownLength = Integer.MAX_VALUE;
String strLength = info.getProperty("unknownLength");
if (strLength != null) {
try {
unknownLength = Integer.parseInt(strLength);
} catch (NumberFormatException nfe) {
throw new PSQLException(GT.tr("unknownLength parameter value must be an integer"), PSQLState.INVALID_PARAMETER_VALUE, nfe);
}
}
DEBUG.P("bindStringAsVarchar="+bindStringAsVarchar);
DEBUG.P("unknownLength="+unknownLength);
// Initialize object handling
_typeCache = createTypeInfo(this, unknownLength);
initObjectTypes(info);
if (Boolean.valueOf(info.getProperty("logUnclosedConnections")).booleanValue()) {
openStackTrace = new Throwable("Connection was created at this point:");
enableDriverManagerLogging();
}
}finally{//我加上的
DEBUG.P(0,this,"AbstractJdbc2Connection(6)");
}
}
private final TimestampUtils timestampUtils;
public TimestampUtils getTimestampUtils() { return timestampUtils; }
/*
* The current type mappings
*/
protected java.util.Map typemap;
public java.sql.Statement createStatement() throws SQLException
{
// We now follow the spec and default to TYPE_FORWARD_ONLY.
return createStatement(java.sql.ResultSet.TYPE_FORWARD_ONLY, java.sql.ResultSet.CONCUR_READ_ONLY);
}
public abstract java.sql.Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException;
public java.sql.PreparedStatement prepareStatement(String sql) throws SQLException
{
return prepareStatement(sql, java.sql.ResultSet.TYPE_FORWARD_ONLY, java.sql.ResultSet.CONCUR_READ_ONLY);
}
public abstract java.sql.PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency) throws SQLException;
public java.sql.CallableStatement prepareCall(String sql) throws SQLException
{
return prepareCall(sql, java.sql.ResultSet.TYPE_FORWARD_ONLY, java.sql.ResultSet.CONCUR_READ_ONLY);
}
public abstract java.sql.CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException;
public java.util.Map getTypeMap() throws SQLException
{
checkClosed();
return typemap;
}
// Query executor associated with this connection.
public QueryExecutor getQueryExecutor() {
return protoConnection.getQueryExecutor();
}
/*
* This adds a warning to the warning chain.
* @param warn warning to add
*/
public void addWarning(SQLWarning warn)
{
// Add the warning to the chain
if (firstWarning != null)
firstWarning.setNextWarning(warn);
else
firstWarning = warn;
}
public ResultSet execSQLQuery(String s) throws SQLException {
return execSQLQuery(s, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
}
/**
* Simple query execution.
*/
public ResultSet execSQLQuery(String s, int resultSetType, int resultSetConcurrency) throws SQLException {
BaseStatement stat = (BaseStatement) createStatement(resultSetType, resultSetConcurrency);
boolean hasResultSet = stat.executeWithFlags(s, QueryExecutor.QUERY_SUPPRESS_BEGIN);
while (!hasResultSet && stat.getUpdateCount() != -1)
hasResultSet = stat.getMoreResults();
if (!hasResultSet)
throw new PSQLException(GT.tr("No results were returned by the query."), PSQLState.NO_DATA);
// Transfer warnings to the connection, since the user never
// has a chance to see the statement itself.
SQLWarning warnings = stat.getWarnings();
if (warnings != null)
addWarning(warnings);
return stat.getResultSet();
}
public void execSQLUpdate(String s) throws SQLException {
BaseStatement stmt = (BaseStatement) createStatement();
if (stmt.executeWithFlags(s, QueryExecutor.QUERY_NO_METADATA | QueryExecutor.QUERY_NO_RESULTS | QueryExecutor.QUERY_SUPPRESS_BEGIN))
throw new PSQLException(GT.tr("A result was returned when none was expected."),
PSQLState.TOO_MANY_RESULTS);
// Transfer warnings to the connection, since the user never
// has a chance to see the statement itself.
SQLWarning warnings = stmt.getWarnings();
if (warnings != null)
addWarning(warnings);
stmt.close();
}
/*
* In SQL, a result table can be retrieved through a cursor that
* is named. The current row of a result can be updated or deleted
* using a positioned update/delete statement that references the
* cursor name.
*
* We do not support positioned update/delete, so this is a no-op.
*
* @param cursor the cursor name
* @exception SQLException if a database access error occurs
*/
public void setCursorName(String cursor) throws SQLException
{
checkClosed();
// No-op.
}
/*
* getCursorName gets the cursor name.
*
* @return the current cursor name
* @exception SQLException if a database access error occurs
*/
public String getCursorName() throws SQLException
{
checkClosed();
return null;
}
/*
* We are required to bring back certain information by
* the DatabaseMetaData class. These functions do that.
*
* Method getURL() brings back the URL (good job we saved it)
*
* @return the url
* @exception SQLException just in case...
*/
public String getURL() throws SQLException
{
return creatingURL;
}
/*
* Method getUserName() brings back the User Name (again, we
* saved it)
*
* @return the user name
* @exception SQLException just in case...
*/
public String getUserName() throws SQLException
{
return protoConnection.getUser();
}
/*
* This returns the Fastpath API for the current connection.
*
* <p><b>NOTE:</b> This is not part of JDBC, but allows access to
* functions on the org.postgresql backend itself.
*
* <p>It is primarily used by the LargeObject API
*
* <p>The best way to use this is as follows:
*
* <p><pre>
* import org.postgresql.fastpath.*;
* ...
* Fastpath fp = ((org.postgresql.Connection)myconn).getFastpathAPI();
* </pre>
*
* <p>where myconn is an open Connection to org.postgresql.
*
* @return Fastpath object allowing access to functions on the org.postgresql
* backend.
* @exception SQLException by Fastpath when initialising for first time
*/
public Fastpath getFastpathAPI() throws SQLException
{
checkClosed();
if (fastpath == null)
fastpath = new Fastpath(this);
return fastpath;
}
// This holds a reference to the Fastpath API if already open
private Fastpath fastpath = null;
/*
* This returns the LargeObject API for the current connection.
*
* <p><b>NOTE:</b> This is not part of JDBC, but allows access to
* functions on the org.postgresql backend itself.
*
* <p>The best way to use this is as follows:
*
* <p><pre>
* import org.postgresql.largeobject.*;
* ...
* LargeObjectManager lo = ((org.postgresql.Connection)myconn).getLargeObjectAPI();
* </pre>
*
* <p>where myconn is an open Connection to org.postgresql.
*
* @return LargeObject object that implements the API
* @exception SQLException by LargeObject when initialising for first time
*/
public LargeObjectManager getLargeObjectAPI() throws SQLException
{
checkClosed();
if (largeobject == null)
largeobject = new LargeObjectManager(this);
return largeobject;
}
// This holds a reference to the LargeObject API if already open
private LargeObjectManager largeobject = null;
/*
* This method is used internally to return an object based around
* org.postgresql's more unique data types.
*
* <p>It uses an internal Hashtable to get the handling class. If the
* type is not supported, then an instance of org.postgresql.util.PGobject
* is returned.
*
* You can use the getValue() or setValue() methods to handle the returned
* object. Custom objects can have their own methods.
*
* @return PGobject for this type, and set to value
* @exception SQLException if value is not correct for this type
*/
public Object getObject(String type, String value) throws SQLException
{
if (typemap != null)
{
Class c = (Class) typemap.get(type);
if (c != null)
{
// Handle the type (requires SQLInput & SQLOutput classes to be implemented)
throw new PSQLException(GT.tr("Custom type maps are not supported."), PSQLState.NOT_IMPLEMENTED);
}
}
PGobject obj = null;
if (logger.logDebug())
logger.debug("Constructing object from type=" + type + " value=<" + value + ">");
try
{
Class klass = _typeCache.getPGobject(type);
// If className is not null, then try to instantiate it,
// It must be basetype PGobject
// This is used to implement the org.postgresql unique types (like lseg,
// point, etc).
if (klass != null)
{
obj = (PGobject) (klass.newInstance());
obj.setType(type);
obj.setValue(value);
}
else
{
// If className is null, then the type is unknown.
// so return a PGobject with the type set, and the value set
obj = new PGobject();
obj.setType( type );
obj.setValue( value );
}
return obj;
}
catch (SQLException sx)
{
// rethrow the exception. Done because we capture any others next
throw sx;
}
catch (Exception ex)
{
throw new PSQLException(GT.tr("Failed to create object for: {0}.", type), PSQLState.CONNECTION_FAILURE, ex);
}
}
protected TypeInfo createTypeInfo(BaseConnection conn, int unknownLength)
{
return new TypeInfoCache(conn, unknownLength);
}
public TypeInfo getTypeInfo()
{
return _typeCache;
}
public void addDataType(String type, String name)
{
try
{
addDataType(type, Class.forName(name));
}
catch (Exception e)
{
throw new RuntimeException("Cannot register new type: " + e);
}
}
public void addDataType(String type, Class klass) throws SQLException
{
checkClosed();
_typeCache.addDataType(type, klass);
}
// This initialises the objectTypes hashtable
private void initObjectTypes(Properties info) throws SQLException
{
// Add in the types that come packaged with the driver.
// These can be overridden later if desired.
addDataType("box", org.postgresql.geometric.PGbox.class);
addDataType("circle", org.postgresql.geometric.PGcircle.class);
addDataType("line", org.postgresql.geometric.PGline.class);
addDataType("lseg", org.postgresql.geometric.PGlseg.class);
addDataType("path", org.postgresql.geometric.PGpath.class);
addDataType("point", org.postgresql.geometric.PGpoint.class);
addDataType("polygon", org.postgresql.geometric.PGpolygon.class);
addDataType("money", org.postgresql.util.PGmoney.class);
addDataType("interval", org.postgresql.util.PGInterval.class);
for (Enumeration e = info.propertyNames(); e.hasMoreElements(); )
{
String propertyName = (String)e.nextElement();
if (propertyName.startsWith("datatype."))
{
String typeName = propertyName.substring(9);
String className = info.getProperty(propertyName);
Class klass;
try
{
klass = Class.forName(className);
}
catch (ClassNotFoundException cnfe)
{
throw new PSQLException(GT.tr("Unable to load the class {0} responsible for the datatype {1}", new Object[] { className, typeName }),
PSQLState.SYSTEM_ERROR, cnfe);
}
addDataType(typeName, klass);
}
}
}
/**
* In some cases, it is desirable to immediately release a Connection's
* database and JDBC resources instead of waiting for them to be
* automatically released.
*
* <B>Note:</B> A Connection is automatically closed when it is
* garbage collected. Certain fatal errors also result in a closed
* connection.
*
* @exception SQLException if a database access error occurs
*/
public void close()
{
protoConnection.close();
openStackTrace = null;
}
/*
* A driver may convert the JDBC sql grammar into its system's
* native SQL grammar prior to sending it; nativeSQL returns the
* native form of the statement that the driver would have sent.
*
* @param sql a SQL statement that may contain one or more '?'
* parameter placeholders
* @return the native form of this statement
* @exception SQLException if a database access error occurs
*/
public String nativeSQL(String sql) throws SQLException
{
checkClosed();
StringBuffer buf = new StringBuffer(sql.length());
AbstractJdbc2Statement.parseSql(sql,0,buf,false,getStandardConformingStrings());
return buf.toString();
}
/*
* The first warning reported by calls on this Connection is
* returned.
*
* <B>Note:</B> Sebsequent warnings will be changed to this
* SQLWarning
*
* @return the first SQLWarning or null
* @exception SQLException if a database access error occurs
*/
public synchronized SQLWarning getWarnings()
throws SQLException
{
checkClosed();
SQLWarning newWarnings = protoConnection.getWarnings(); // NB: also clears them.
if (firstWarning == null)
firstWarning = newWarnings;
else
firstWarning.setNextWarning(newWarnings); // Chain them on.
return firstWarning;
}
/*
* After this call, getWarnings returns null until a new warning
* is reported for this connection.
*
* @exception SQLException if a database access error occurs
*/
public synchronized void clearWarnings()
throws SQLException
{
checkClosed();
protoConnection.getWarnings(); // Clear and discard.
firstWarning = null;
}
/*
* You can put a connection in read-only mode as a hunt to enable
* database optimizations
*
* <B>Note:</B> setReadOnly cannot be called while in the middle
* of a transaction
*
* @param readOnly - true enables read-only mode; false disables it
* @exception SQLException if a database access error occurs
*/
public void setReadOnly(boolean readOnly) throws SQLException
{
checkClosed();
if (protoConnection.getTransactionState() != ProtocolConnection.TRANSACTION_IDLE)
throw new PSQLException(GT.tr("Cannot change transaction read-only property in the middle of a transaction."),
PSQLState.ACTIVE_SQL_TRANSACTION);
if (haveMinimumServerVersion("7.4") && readOnly != this.readOnly)
{
String readOnlySql = "SET SESSION CHARACTERISTICS AS TRANSACTION " + (readOnly ? "READ ONLY" : "READ WRITE");
execSQLUpdate(readOnlySql); // nb: no BEGIN triggered.
}
this.readOnly = readOnly;
}
/*
* Tests to see if the connection is in Read Only Mode.
*
* @return true if the connection is read only
* @exception SQLException if a database access error occurs
*/
public boolean isReadOnly() throws SQLException
{
checkClosed();
return readOnly;
}
/*
* If a connection is in auto-commit mode, than all its SQL
* statements will be executed and committed as individual
* transactions. Otherwise, its SQL statements are grouped
* into transactions that are terminated by either commit()
* or rollback(). By default, new connections are in auto-
* commit mode. The commit occurs when the statement completes
* or the next execute occurs, whichever comes first. In the
* case of statements returning a ResultSet, the statement
* completes when the last row of the ResultSet has been retrieved
* or the ResultSet has been closed. In advanced cases, a single
* statement may return multiple results as well as output parameter
* values. Here the commit occurs when all results and output param
* values have been retrieved.
*
* @param autoCommit - true enables auto-commit; false disables it
* @exception SQLException if a database access error occurs
*/
public void setAutoCommit(boolean autoCommit) throws SQLException
{
try {//我加上的
DEBUG.P(this,"setAutoCommit(1)");
DEBUG.P("autoCommit="+autoCommit);
DEBUG.P("this.autoCommit="+this.autoCommit);
checkClosed();
if (this.autoCommit == autoCommit)
return ;
if (!this.autoCommit)
commit();
this.autoCommit = autoCommit;
}finally{//我加上的
DEBUG.P(0,this,"setAutoCommit(1)");
}
}
/*
* gets the current auto-commit state
*
* @return Current state of the auto-commit mode
* @see setAutoCommit
*/
public boolean getAutoCommit() throws SQLException
{
checkClosed();
return this.autoCommit;
}
private void executeTransactionCommand(Query query) throws SQLException {
try {//我加上的
DEBUG.P(this,"executeTransactionCommand(1)");
DEBUG.P("query="+query);
getQueryExecutor().execute(query, null, new TransactionCommandHandler(),
0, 0, QueryExecutor.QUERY_NO_METADATA | QueryExecutor.QUERY_NO_RESULTS | QueryExecutor.QUERY_SUPPRESS_BEGIN);
}finally{//我加上的
DEBUG.P(0,this,"executeTransactionCommand(1)");
}
}
/*
* The method commit() makes all changes made since the previous
* commit/rollback permanent and releases any database locks currently
* held by the Connection. This method should only be used when
* auto-commit has been disabled.
*
* @exception SQLException if a database access error occurs,
* this method is called on a closed connection or
* this Connection object is in auto-commit mode
* @see setAutoCommit
*/
public void commit() throws SQLException
{
checkClosed();
if (autoCommit)
throw new PSQLException(GT.tr("Cannot commit when autoCommit is enabled."),
PSQLState.NO_ACTIVE_SQL_TRANSACTION);
if (protoConnection.getTransactionState() != ProtocolConnection.TRANSACTION_IDLE)
executeTransactionCommand(commitQuery);
}
protected void checkClosed() throws SQLException {
if (isClosed())
throw new PSQLException(GT.tr("This connection has been closed."),
PSQLState.CONNECTION_DOES_NOT_EXIST);
}
/*
* The method rollback() drops all changes made since the previous
* commit/rollback and releases any database locks currently held by
* the Connection.
*
* @exception SQLException if a database access error occurs,
* this method is called on a closed connection or
* this Connection object is in auto-commit mode
* @see commit
*/
public void rollback() throws SQLException
{
checkClosed();
if (autoCommit)
throw new PSQLException(GT.tr("Cannot rollback when autoCommit is enabled."),
PSQLState.NO_ACTIVE_SQL_TRANSACTION);
if (protoConnection.getTransactionState() != ProtocolConnection.TRANSACTION_IDLE)
executeTransactionCommand(rollbackQuery);
}
public int getTransactionState() {
return protoConnection.getTransactionState();
}
/*
* Get this Connection's current transaction isolation mode.
*
* @return the current TRANSACTION_* mode value
* @exception SQLException if a database access error occurs
*/
public int getTransactionIsolation() throws SQLException
{
checkClosed();
String level = null;
if (haveMinimumServerVersion("7.3"))
{
// 7.3+ returns the level as a query result.
ResultSet rs = execSQLQuery("SHOW TRANSACTION ISOLATION LEVEL"); // nb: no BEGIN triggered
if (rs.next())
level = rs.getString(1);
rs.close();
}
else
{
// 7.2 returns the level as an INFO message. Ew.
// We juggle the warning chains a bit here.
// Swap out current warnings.
SQLWarning saveWarnings = getWarnings();
clearWarnings();
// Run the query any examine any resulting warnings.
execSQLUpdate("SHOW TRANSACTION ISOLATION LEVEL"); // nb: no BEGIN triggered
SQLWarning warning = getWarnings();
if (warning != null)
level = warning.getMessage();
// Swap original warnings back.
clearWarnings();
if (saveWarnings != null)
addWarning(saveWarnings);
}
// XXX revisit: throw exception instead of silently eating the error in unkwon cases?
if (level == null)
return Connection.TRANSACTION_READ_COMMITTED; // Best guess.
level = level.toUpperCase(Locale.US);
if (level.indexOf("READ COMMITTED") != -1)
return Connection.TRANSACTION_READ_COMMITTED;
if (level.indexOf("READ UNCOMMITTED") != -1)
return Connection.TRANSACTION_READ_UNCOMMITTED;
if (level.indexOf("REPEATABLE READ") != -1)
return Connection.TRANSACTION_REPEATABLE_READ;
if (level.indexOf("SERIALIZABLE") != -1)
return Connection.TRANSACTION_SERIALIZABLE;
return Connection.TRANSACTION_READ_COMMITTED; // Best guess.
}
/*
* You can call this method to try to change the transaction
* isolation level using one of the TRANSACTION_* values.
*
* <B>Note:</B> setTransactionIsolation cannot be called while
* in the middle of a transaction
*
* @param level one of the TRANSACTION_* isolation values with
* the exception of TRANSACTION_NONE; some databases may
* not support other values
* @exception SQLException if a database access error occurs
* @see java.sql.DatabaseMetaData#supportsTransactionIsolationLevel
*/
public void setTransactionIsolation(int level) throws SQLException
{
checkClosed();
if (protoConnection.getTransactionState() != ProtocolConnection.TRANSACTION_IDLE)
throw new PSQLException(GT.tr("Cannot change transaction isolation level in the middle of a transaction."),
PSQLState.ACTIVE_SQL_TRANSACTION);
String isolationLevelName = getIsolationLevelName(level);
if (isolationLevelName == null)
throw new PSQLException(GT.tr("Transaction isolation level {0} not supported.", new Integer(level)), PSQLState.NOT_IMPLEMENTED);
String isolationLevelSQL = "SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL " + isolationLevelName;
execSQLUpdate(isolationLevelSQL); // nb: no BEGIN triggered
}
protected String getIsolationLevelName(int level)
{
boolean pg80 = haveMinimumServerVersion("8.0");
if (level == Connection.TRANSACTION_READ_COMMITTED)
{
return "READ COMMITTED";
}
else if (level == Connection.TRANSACTION_SERIALIZABLE)
{
return "SERIALIZABLE";
}
else if (pg80 && level == Connection.TRANSACTION_READ_UNCOMMITTED)
{
return "READ UNCOMMITTED";
}
else if (pg80 && level == Connection.TRANSACTION_REPEATABLE_READ)
{
return "REPEATABLE READ";
}
return null;
}
/*
* A sub-space of this Connection's database may be selected by
* setting a catalog name. If the driver does not support catalogs,
* it will silently ignore this request
*
* @exception SQLException if a database access error occurs
*/
public void setCatalog(String catalog) throws SQLException
{
checkClosed();
//no-op
}
/*
* Return the connections current catalog name, or null if no
* catalog name is set, or we dont support catalogs.
*
* @return the current catalog name or null
* @exception SQLException if a database access error occurs
*/
public String getCatalog() throws SQLException
{
checkClosed();
return protoConnection.getDatabase();
}
/*
* Overides finalize(). If called, it closes the connection.
*
* This was done at the request of Rachel Greenham
* <rachel@enlarion.demon.co.uk> who hit a problem where multiple
* clients didn't close the connection, and once a fortnight enough
* clients were open to kill the postgres server.
*/
protected void finalize() throws Throwable
{
if (openStackTrace != null)
logger.log(GT.tr("Finalizing a Connection that was never closed:"), openStackTrace);
close();
}
/*
* Get server version number
*/
public String getDBVersionNumber()
{
return dbVersionNumber;
}
// Parse a "dirty" integer surrounded by non-numeric characters
private static int integerPart(String dirtyString)
{
int start, end;
for (start = 0; start < dirtyString.length() && !Character.isDigit(dirtyString.charAt(start)); ++start)
;
for (end = start; end < dirtyString.length() && Character.isDigit(dirtyString.charAt(end)); ++end)
;
if (start == end)
return 0;
return Integer.parseInt(dirtyString.substring(start, end));
}
/*
* Get server major version
*/
public int getServerMajorVersion()
{
try
{
StringTokenizer versionTokens = new StringTokenizer(dbVersionNumber, "."); // aaXbb.ccYdd
return integerPart(versionTokens.nextToken()); // return X
}
catch (NoSuchElementException e)
{
return 0;
}
}
/*
* Get server minor version
*/
public int getServerMinorVersion()
{
try
{
StringTokenizer versionTokens = new StringTokenizer(dbVersionNumber, "."); // aaXbb.ccYdd
versionTokens.nextToken(); // Skip aaXbb
return integerPart(versionTokens.nextToken()); // return Y
}
catch (NoSuchElementException e)
{
return 0;
}
}
/**
* Is the server we are connected to running at least this version?
* This comparison method will fail whenever a major or minor version
* goes to two digits (10.3.0) or (7.10.1).
*/
public boolean haveMinimumServerVersion(String ver)
{
return (dbVersionNumber.compareTo(ver) >= 0);
}
/*
* This method returns true if the compatible level set in the connection
* (which can be passed into the connection or specified in the URL)
* is at least the value passed to this method. This is used to toggle
* between different functionality as it changes across different releases
* of the jdbc driver code. The values here are versions of the jdbc client
* and not server versions. For example in 7.1 get/setBytes worked on
* LargeObject values, in 7.2 these methods were changed to work on bytea
* values. This change in functionality could be disabled by setting the
* "compatible" level to be 7.1, in which case the driver will revert to
* the 7.1 functionality.
*/
public boolean haveMinimumCompatibleVersion(String ver)
{
return (compatible.compareTo(ver) >= 0);
}
public Encoding getEncoding() {
return protoConnection.getEncoding();
}
public byte[] encodeString(String str) throws SQLException {
try
{
return getEncoding().encode(str);
}
catch (IOException ioe)
{
throw new PSQLException(GT.tr("Unable to translate data into the desired encoding."), PSQLState.DATA_ERROR, ioe);
}
}
public String escapeString(String str) throws SQLException {
return Utils.appendEscapedLiteral(null, str,
protoConnection.getStandardConformingStrings()).toString();
}
public boolean getStandardConformingStrings() {
return protoConnection.getStandardConformingStrings();
}
// This is a cache of the DatabaseMetaData instance for this connection
protected java.sql.DatabaseMetaData metadata;
/*
* Tests to see if a Connection is closed
*
* @return the status of the connection
* @exception SQLException (why?)
*/
public boolean isClosed() throws SQLException
{
return protoConnection.isClosed();
}
public void cancelQuery() throws SQLException
{
checkClosed();
protoConnection.sendQueryCancel();
}
public PGNotification[] getNotifications() throws SQLException
{
checkClosed();
getQueryExecutor().processNotifies();
// Backwards-compatibility hand-holding.
PGNotification[] notifications = protoConnection.getNotifications();
return (notifications.length == 0 ? null : notifications);
}
//
// Handler for transaction queries
//
private class TransactionCommandHandler implements ResultHandler {
private SQLException error;
public void handleResultRows(Query fromQuery, Field[] fields, Vector tuples, ResultCursor cursor) {
}
public void handleCommandStatus(String status, int updateCount, long insertOID) {
}
public void handleWarning(SQLWarning warning) {
AbstractJdbc2Connection.this.addWarning(warning);
}
public void handleError(SQLException newError) {
if (error == null)
error = newError;
else
error.setNextException(newError);
}
public void handleCompletion() throws SQLException {
if (error != null)
throw error;
}
}
public int getPrepareThreshold() {
return prepareThreshold;
}
public void setPrepareThreshold(int newThreshold) {
this.prepareThreshold = (newThreshold <= 0 ? 0 : newThreshold);
}
public void setTypeMapImpl(java.util.Map map) throws SQLException
{
typemap = map;
}
public Logger getLogger()
{
return logger;
}
//Because the get/setLogStream methods are deprecated in JDBC2
//we use the get/setLogWriter methods here for JDBC2 by overriding
//the base version of this method
protected void enableDriverManagerLogging()
{
if (DriverManager.getLogWriter() == null)
{
DriverManager.setLogWriter(new PrintWriter(System.out, true));
}
}
public int getProtocolVersion()
{
return protoConnection.getProtocolVersion();
}
public boolean getStringVarcharFlag()
{
return bindStringAsVarchar;
}
private CopyManager copyManager = null;
public CopyManager getCopyAPI() throws SQLException
{
checkClosed();
if (copyManager == null)
copyManager = new CopyManager(this);
return copyManager;
}
}