import org.postgresql.core.Encoding;
/**
- * $Id: Connection.java,v 1.20 2001/07/21 18:56:17 momjian Exp $
+ * $Id: Connection.java,v 1.21 2001/07/30 14:51:19 momjian Exp $
*
* This abstract class is used by org.postgresql.Driver to open either the JDBC1 or
* JDBC2 versions of the Connection class.
// Now handle notices as warnings, so things like "show" now work
public SQLWarning firstWarning = null;
+ /**
+ * Cache of the current isolation level
+ */
+ private int isolationLevel = java.sql.Connection.TRANSACTION_READ_COMMITTED;
+
// The PID an cancellation key we get from the backend process
public int pid;
public int ckey;
*/
protected abstract java.sql.ResultSet getResultSet(org.postgresql.Connection conn,java.sql.Statement stat, Field[] fields, Vector tuples, String status, int updateCount,int insertOID) throws SQLException;
- public abstract void close() throws SQLException;
+ /**
+ * 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 (cant think why off the top of my head)
+ *
+ * <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() throws SQLException {
+ if (pg_stream != null) {
+ try {
+ pg_stream.SendChar('X');
+ pg_stream.flush();
+ pg_stream.close();
+ } catch (IOException e) {}
+ pg_stream = 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 {
+ return sql;
+ }
+
+ /**
+ * 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 SQLWarning getWarnings() throws SQLException {
+ 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 void clearWarnings() throws SQLException {
+ 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 {
+ this.readOnly = readOnly;
+ }
+
+ /**
+ * Tests to see if the connection is in Read Only Mode. Note that
+ * we cannot really put the database in read only mode, but we pretend
+ * we can by returning the value of the readOnly flag
+ *
+ * @return true if the connection is read only
+ * @exception SQLException if a database access error occurs
+ */
+ public boolean isReadOnly() throws SQLException {
+ 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 {
+ if (this.autoCommit == autoCommit)
+ return;
+ if (autoCommit)
+ ExecSQL("end");
+ else {
+ ExecSQL("begin");
+ doIsolationLevel();
+ }
+ this.autoCommit = autoCommit;
+ }
+
+ /**
+ * gets the current auto-commit state
+ *
+ * @return Current state of the auto-commit mode
+ * @exception SQLException (why?)
+ * @see setAutoCommit
+ */
+ public boolean getAutoCommit() throws SQLException {
+ return this.autoCommit;
+ }
+
+ /**
+ * 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. (If autoCommit == true, then we
+ * just return anyhow)
+ *
+ * @exception SQLException if a database access error occurs
+ * @see setAutoCommit
+ */
+ public void commit() throws SQLException {
+ if (autoCommit)
+ return;
+ ExecSQL("commit");
+ autoCommit = true;
+ ExecSQL("begin");
+ doIsolationLevel();
+ autoCommit = false;
+ }
+
+ /**
+ * 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
+ * @see commit
+ */
+ public void rollback() throws SQLException {
+ if (autoCommit)
+ return;
+ ExecSQL("rollback");
+ autoCommit = true;
+ ExecSQL("begin");
+ doIsolationLevel();
+ autoCommit = false;
+ }
+
+ /**
+ * 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 {
+ clearWarnings();
+ ExecSQL("show xactisolevel");
+
+ SQLWarning warning = getWarnings();
+ if (warning != null) {
+ String message = warning.getMessage();
+ clearWarnings();
+ if (message.indexOf("READ COMMITTED") != -1)
+ return java.sql.Connection.TRANSACTION_READ_COMMITTED;
+ else if (message.indexOf("READ UNCOMMITTED") != -1)
+ return java.sql.Connection.TRANSACTION_READ_UNCOMMITTED;
+ else if (message.indexOf("REPEATABLE READ") != -1)
+ return java.sql.Connection.TRANSACTION_REPEATABLE_READ;
+ else if (message.indexOf("SERIALIZABLE") != -1)
+ return java.sql.Connection.TRANSACTION_SERIALIZABLE;
+ }
+ return java.sql.Connection.TRANSACTION_READ_COMMITTED;
+ }
+
+ /**
+ * 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 {
+ isolationLevel = level;
+ doIsolationLevel();
+ }
+
+ /**
+ * Helper method used by setTransactionIsolation(), commit(), rollback()
+ * and setAutoCommit(). This sets the current isolation level.
+ */
+ protected void doIsolationLevel() throws SQLException {
+ String q = "SET TRANSACTION ISOLATION LEVEL";
+
+ switch(isolationLevel) {
+ case java.sql.Connection.TRANSACTION_READ_COMMITTED:
+ ExecSQL(q + " READ COMMITTED");
+ return;
+
+ case java.sql.Connection.TRANSACTION_SERIALIZABLE:
+ ExecSQL(q + " SERIALIZABLE");
+ return;
+
+ default:
+ throw new PSQLException("postgresql.con.isolevel",new Integer(isolationLevel));
+ }
+ }
/**
* A sub-space of this Connection's database may be selected by
import org.postgresql.util.*;
/**
- * $Id: PG_Stream.java,v 1.10 2001/07/21 18:52:10 momjian Exp $
+ * $Id: PG_Stream.java,v 1.11 2001/07/30 14:51:19 momjian Exp $
*
* This class is used by Connection & PGlobj for communicating with the
* backend.
*/
public void close() throws IOException
{
- pg_output.write("X".getBytes());
- pg_output.flush();
pg_output.close();
pg_input.close();
connection.close();
import org.postgresql.util.*;
/**
- * $Id: Connection.java,v 1.6 2001/07/21 18:56:17 momjian Exp $
+ * $Id: Connection.java,v 1.7 2001/07/30 14:51:19 momjian Exp $
*
* A Connection represents a session with a specific database. Within the
* context of a Connection, SQL statements are executed and results are
// return new CallableStatement(this, sql);
}
- /**
- * 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
- {
- return sql;
- }
-
- /**
- * 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
- {
- if (this.autoCommit == autoCommit)
- return;
- if (autoCommit)
- ExecSQL("end");
- else
- ExecSQL("begin");
- this.autoCommit = autoCommit;
- }
-
- /**
- * gets the current auto-commit state
- *
- * @return Current state of the auto-commit mode
- * @exception SQLException (why?)
- * @see setAutoCommit
- */
- public boolean getAutoCommit() throws SQLException
- {
- return this.autoCommit;
- }
-
- /**
- * 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. (If autoCommit == true, then we
- * just return anyhow)
- *
- * @exception SQLException if a database access error occurs
- * @see setAutoCommit
- */
- public void commit() throws SQLException
- {
- if (autoCommit)
- return;
- ExecSQL("commit");
- autoCommit = true;
- ExecSQL("begin");
- autoCommit = false;
- }
-
- /**
- * 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
- * @see commit
- */
- public void rollback() throws SQLException
- {
- if (autoCommit)
- return;
- ExecSQL("rollback");
- autoCommit = true;
- ExecSQL("begin");
- autoCommit = false;
- }
-
- /**
- * 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 (cant think why off the top of my head)
- *
- * <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() throws SQLException
- {
- if (pg_stream != null)
- {
- try
- {
- pg_stream.close();
- } catch (IOException e) {}
- pg_stream = null;
- }
- }
-
/**
* Tests to see if a Connection is closed
*
return metadata;
}
- /**
- * 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
- {
- this.readOnly = readOnly;
- }
-
- /**
- * Tests to see if the connection is in Read Only Mode. Note that
- * we cannot really put the database in read only mode, but we pretend
- * we can by returning the value of the readOnly flag
- *
- * @return true if the connection is read only
- * @exception SQLException if a database access error occurs
- */
- public boolean isReadOnly() throws SQLException
- {
- return readOnly;
- }
-
- /**
- * 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
- {
- String q = "SET TRANSACTION ISOLATION LEVEL";
-
- switch(level) {
-
- case java.sql.Connection.TRANSACTION_READ_COMMITTED:
- ExecSQL(q + " READ COMMITTED");
- return;
-
- case java.sql.Connection.TRANSACTION_SERIALIZABLE:
- ExecSQL(q + " SERIALIZABLE");
- return;
-
- default:
- throw new PSQLException("postgresql.con.isolevel",new Integer(level));
- }
- }
-
- /**
- * 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
- {
- ExecSQL("show xactisolevel");
-
- SQLWarning w = getWarnings();
- if (w != null) {
- if (w.getMessage().indexOf("READ COMMITTED") != -1) return java.sql.Connection.TRANSACTION_READ_COMMITTED; else
- if (w.getMessage().indexOf("READ UNCOMMITTED") != -1) return java.sql.Connection.TRANSACTION_READ_UNCOMMITTED; else
- if (w.getMessage().indexOf("REPEATABLE READ") != -1) return java.sql.Connection.TRANSACTION_REPEATABLE_READ; else
- if (w.getMessage().indexOf("SERIALIZABLE") != -1) return java.sql.Connection.TRANSACTION_SERIALIZABLE;
- }
- return java.sql.Connection.TRANSACTION_READ_COMMITTED;
- }
-
- /**
- * 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 SQLWarning getWarnings() throws SQLException
- {
- 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 void clearWarnings() throws SQLException
- {
- firstWarning = null;
- }
-
/**
* This overides the method in org.postgresql.Connection and returns a
* ResultSet.
import org.postgresql.util.*;
/**
- * $Id: Connection.java,v 1.8 2001/07/21 18:56:17 momjian Exp $
+ * $Id: Connection.java,v 1.9 2001/07/30 14:51:19 momjian Exp $
*
* A Connection represents a session with a specific database. Within the
* context of a Connection, SQL statements are executed and results are
*/
protected java.util.Map typemap;
- /**
- * Cache of the current isolation level
- */
- protected int isolationLevel = java.sql.Connection.TRANSACTION_READ_COMMITTED;
-
/**
* SQL statements without parameters are normally executed using
* Statement objects. If the same SQL statement is executed many
//return s;
}
-
- /**
- * 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
- {
- return sql;
- }
-
- /**
- * 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
- {
- if (this.autoCommit == autoCommit)
- return;
- if (autoCommit)
- ExecSQL("end");
- else {
- ExecSQL("begin");
- doIsolationLevel();
- }
- this.autoCommit = autoCommit;
- }
-
- /**
- * gets the current auto-commit state
- *
- * @return Current state of the auto-commit mode
- * @exception SQLException (why?)
- * @see setAutoCommit
- */
- public boolean getAutoCommit() throws SQLException
- {
- return this.autoCommit;
- }
-
- /**
- * 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. (If autoCommit == true, then we
- * just return anyhow)
- *
- * @exception SQLException if a database access error occurs
- * @see setAutoCommit
- */
- public void commit() throws SQLException
- {
- if (autoCommit)
- return;
- ExecSQL("commit");
- autoCommit = true;
- ExecSQL("begin");
- doIsolationLevel();
- autoCommit = false;
- }
-
- /**
- * 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
- * @see commit
- */
- public void rollback() throws SQLException
- {
- if (autoCommit)
- return;
- ExecSQL("rollback");
- autoCommit = true;
- ExecSQL("begin");
- doIsolationLevel();
- autoCommit = false;
- }
-
- /**
- * 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 (cant think why off the top of my head)
- *
- * <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() throws SQLException
- {
- if (pg_stream != null)
- {
- try
- {
- pg_stream.close();
- } catch (IOException e) {}
- pg_stream = null;
- }
- }
-
/**
* Tests to see if a Connection is closed.
*
return metadata;
}
- /**
- * 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
- {
- this.readOnly = readOnly;
- }
-
- /**
- * Tests to see if the connection is in Read Only Mode. Note that
- * we cannot really put the database in read only mode, but we pretend
- * we can by returning the value of the readOnly flag
- *
- * @return true if the connection is read only
- * @exception SQLException if a database access error occurs
- */
- public boolean isReadOnly() throws SQLException
- {
- return readOnly;
- }
-
- /**
- * 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
- {
- isolationLevel = level;
- doIsolationLevel();
- }
-
- /**
- * Helper method used by setTransactionIsolation(), commit(), rollback()
- * and setAutoCommit(). This sets the current isolation level.
- */
- private void doIsolationLevel() throws SQLException
- {
- String q = "SET TRANSACTION ISOLATION LEVEL";
-
- switch(isolationLevel) {
-
- case java.sql.Connection.TRANSACTION_READ_COMMITTED:
- ExecSQL(q + " READ COMMITTED");
- return;
-
- case java.sql.Connection.TRANSACTION_SERIALIZABLE:
- ExecSQL(q + " SERIALIZABLE");
- return;
-
- default:
- throw new PSQLException("postgresql.con.isolevel",new Integer(isolationLevel));
- }
- }
-
- /**
- * 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
- {
- clearWarnings();
- ExecSQL("show xactisolevel");
-
- SQLWarning w = getWarnings();
- if (w != null) {
- String m = w.getMessage();
- clearWarnings();
- if (m.indexOf("READ COMMITTED") != -1) return java.sql.Connection.TRANSACTION_READ_COMMITTED; else
- if (m.indexOf("READ UNCOMMITTED") != -1) return java.sql.Connection.TRANSACTION_READ_UNCOMMITTED; else
- if (m.indexOf("REPEATABLE READ") != -1) return java.sql.Connection.TRANSACTION_REPEATABLE_READ; else
- if (m.indexOf("SERIALIZABLE") != -1) return java.sql.Connection.TRANSACTION_SERIALIZABLE;
- }
- return java.sql.Connection.TRANSACTION_READ_COMMITTED;
- }
-
- /**
- * 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 SQLWarning getWarnings() throws SQLException
- {
- 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 void clearWarnings() throws SQLException
- {
- firstWarning = null;
- }
-
/**
* This overides the method in org.postgresql.Connection and returns a
* ResultSet.
projects / postgresql / commitdiff