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org.hsqldb.jdbc
Class jdbcStatement

java.lang.Object
  extended byorg.hsqldb.jdbc.jdbcStatement
All Implemented Interfaces:
Statement
Direct Known Subclasses:
jdbcPreparedStatement
public class jdbcStatement
extends Object
implements Statement

The object used for executing a static SQL statement and returning the results it produces.

By default, only one ResultSet object per Statement object can be open at the same time. Therefore, if the reading of one ResultSet object is interleaved with the reading of another, each must have been generated by different Statement objects. All execution methods in the Statement interface implicitly close a statment's current ResultSet object if an open one exists.

HSQLDB-Specific Information:

JRE 1.1.x Notes:

In general, JDBC 2 support requires Java 1.2 and above, and JDBC3 requires Java 1.4 and above. In HSQLDB, support for methods introduced in different versions of JDBC depends on the JDK version used for compiling and building HSQLDB.

Since 1.7.0, all JDBC 2 methods can be called while executing under the version 1.1.x Java Runtime EnvironmentTM. However, in addition to this technique requiring explicit casts to the org.hsqldb.jdbcXXX classes, some of these method calls require int values that are defined only in the JDBC 2 or greater version of the ResultSet interface. For this reason these values are defined in jdbcResultSet.

In a JRE 1.1.x environment, calling JDBC 2 methods that take or return the JDBC2-only ResultSet values can be achieved by referring to them in parameter specifications and return value comparisons, respectively, as follows:

jdbcResultSet.FETCH_FORWARD
jdbcResultSet.TYPE_FORWARD_ONLY
jdbcResultSet.TYPE_SCROLL_INSENSITIVE
jdbcResultSet.CONCUR_READ_ONLY

However, please note that code written to use HSQLDB JDBC 2 features under JDK 1.1.x will not be compatible for use with other JDBC 2 drivers. Please also note that this feature is offered solely as a convenience to developers who must work under JDK 1.1.x due to operating constraints, yet wish to use some of the more advanced features available under the JDBC 2 specification.

(fredt@users)
(boucherb@users)

Version:
1.7.2
Author:
boucherb@users, fredt@user
See Also:
jdbcConnection.createStatement(), jdbcResultSet

Field Summary
protected  Result batchResultOut
          Use by this statement to communicate batched execution requests
protected  jdbcConnection connection
          The connection used to execute this statement.
protected  int maxRows
          The maximum number of rows to generate when executing this statement.
protected  Result resultIn
          The result of executing this statement.
protected  Result resultOut
          Used by this statement to communicate non-batched requests.
protected  int rsType
          The result set type obtained by executing this statement.
 
Fields inherited from interface java.sql.Statement
CLOSE_ALL_RESULTS, CLOSE_CURRENT_RESULT, EXECUTE_FAILED, KEEP_CURRENT_RESULT, NO_GENERATED_KEYS, RETURN_GENERATED_KEYS, SUCCESS_NO_INFO
 
Method Summary
 void addBatch(String sql)
           Adds the given SQL command to the current list of commmands for this Statement object.
 void cancel()
           Cancels this Statement object if both the DBMS and driver support aborting an SQL statement.
 void clearBatch()
           Empties this Statement object's current list of SQL commands.
 void clearWarnings()
           Clears all the warnings reported on this Statement object.
 void close()
           Releases this Statement object's database and JDBC resources immediately instead of waiting for this to happen when it is automatically closed.
 boolean execute(String sql)
           Executes the given SQL statement, which may return multiple results.
 boolean execute(String sql, int autoGeneratedKeys)
           Executes the given SQL statement, which may return multiple results, and signals the driver that any auto-generated keys should be made available for retrieval.
 boolean execute(String sql, int[] columnIndexes)
           Executes the given SQL statement, which may return multiple results, and signals the driver that the auto-generated keys indicated in the given array should be made available for retrieval.
 boolean execute(String sql, String[] columnNames)
           Executes the given SQL statement, which may return multiple results, and signals the driver that the auto-generated keys indicated in the given array should be made available for retrieval.
 int[] executeBatch()
           Submits a batch of commands to the database for execution and if all commands execute successfully, returns an array of update counts.
 ResultSet executeQuery(String sql)
           Executes the given SQL statement, which returns a single ResultSet object.
 int executeUpdate(String sql)
           Executes the given SQL statement, which may be an INSERT, UPDATE, or DELETE statement or an SQL statement that returns nothing, such as an SQL DDL statement.
 int executeUpdate(String sql, int autoGeneratedKeys)
           Executes the given SQL statement and signals the driver with the given flag about whether the auto-generated keys produced by this Statement object should be made available for retrieval.
 int executeUpdate(String sql, int[] columnIndexes)
           Executes the given SQL statement and signals the driver that the auto-generated keys indicated in the given array should be made available for retrieval.
 int executeUpdate(String sql, String[] columnNames)
           Executes the given SQL statement and signals the driver that the auto-generated keys indicated in the given array should be made available for retrieval.
 Connection getConnection()
           Retrieves the Connection object that produced this Statement object.
 int getFetchDirection()
           Retrieves the direction for fetching rows from database tables that is the default for result sets generated from this Statement object.
 int getFetchSize()
           Retrieves the number of result set rows that is the default fetch size for ResultSet objects generated from this Statement object.
 ResultSet getGeneratedKeys()
           Retrieves any auto-generated keys created as a result of executing this Statement object.
 int getMaxFieldSize()
           Retrieves the maximum number of bytes that can be returned for character and binary column values in a ResultSet object produced by this Statement object.
 int getMaxRows()
           Retrieves the maximum number of rows that a ResultSet object produced by this Statement object can contain.
 boolean getMoreResults()
           Moves to this Statement object's next result, returns true if it is a ResultSet object, and implicitly closes any current ResultSet object(s) obtained with the method getResultSet.
 boolean getMoreResults(int current)
           Moves to this Statement object's next result, deals with any current ResultSet object(s) according to the instructions specified by the given flag, and returns true if the next result is a ResultSet object.
 int getQueryTimeout()
           Retrieves the number of seconds the driver will wait for a Statement object to execute.
 ResultSet getResultSet()
           Retrieves the current result as a ResultSet object.
 int getResultSetConcurrency()
           Retrieves the result set concurrency for ResultSet objects generated by this Statement object.
 int getResultSetHoldability()
           Retrieves the result set holdability for ResultSet objects generated by this Statement object.
 int getResultSetType()
           Retrieves the result set type for ResultSet objects generated by this Statement object.
 int getUpdateCount()
           Retrieves the current result as an update count; if the result is a ResultSet object or there are no more results, -1 is returned.
 SQLWarning getWarnings()
           Retrieves the first warning reported by calls on this Statement object.
 void setCursorName(String name)
           Sets the SQL cursor name to the given String, which will be used by subsequent Statement object execute methods.
 void setEscapeProcessing(boolean enable)
           Sets escape processing on or off.
 void setFetchDirection(int direction)
           Gives the driver a hint as to the direction in which rows will be processed in ResultSet objects created using this Statement object.
 void setFetchSize(int rows)
           Gives the JDBC driver a hint as to the number of rows that should be fetched from the database when more rows are needed.
 void setMaxFieldSize(int max)
           Sets the limit for the maximum number of bytes in a ResultSet column storing character or binary values to the given number of bytes.
 void setMaxRows(int max)
           Sets the limit for the maximum number of rows that any ResultSet object can contain to the given number.
 void setQueryTimeout(int seconds)
           Sets the number of seconds the driver will wait for a Statement object to execute to the given number of seconds.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

connection

protected jdbcConnection connection
The connection used to execute this statement.

maxRows

protected int maxRows
The maximum number of rows to generate when executing this statement.

resultIn

protected Result resultIn
The result of executing this statement.

rsType

protected int rsType
The result set type obtained by executing this statement.

resultOut

protected Result resultOut
Used by this statement to communicate non-batched requests.

batchResultOut

protected Result batchResultOut
Use by this statement to communicate batched execution requests

Method Detail

executeQuery

public ResultSet executeQuery(String sql)
                       throws SQLException
Executes the given SQL statement, which returns a single ResultSet object.

Specified by:
executeQuery in interface Statement
Parameters:
sql - an SQL statement to be sent to the database, typically a static SQL SELECT statement
Returns:
a ResultSet object that contains the data produced by the given query; never null
Throws:
SQLException - if a database access error occurs or the given SQL statement produces anything other than a single ResultSet object

executeUpdate

public int executeUpdate(String sql)
                  throws SQLException
Executes the given SQL statement, which may be an INSERT, UPDATE, or DELETE statement or an SQL statement that returns nothing, such as an SQL DDL statement.

Specified by:
executeUpdate in interface Statement
Parameters:
sql - an SQL INSERT, UPDATE or DELETE statement or an SQL statement that returns nothing
Returns:
either the row count for INSERT, UPDATE or DELETE statements, or 0 for SQL statements that return nothing
Throws:
SQLException - if a database access error occurs or the given SQL statement produces a ResultSet object

close

public void close()
           throws SQLException
Releases this Statement object's database and JDBC resources immediately instead of waiting for this to happen when it is automatically closed. It is generally good practice to release resources as soon as you are finished with them to avoid tying up database resources.

Calling the method close on a Statement object that is already closed has no effect.

Note: A Statement object is automatically closed when it is garbage collected. When a Statement object is closed, its current ResultSet object, if one exists, is also closed.

HSQLDB-Specific Information:

Specified by:
close in interface Statement
Throws:
SQLException - if a database access error occurs

getMaxFieldSize

public int getMaxFieldSize()
                    throws SQLException
Retrieves the maximum number of bytes that can be returned for character and binary column values in a ResultSet object produced by this Statement object. This limit applies only to BINARY, VARBINARY, LONGVARBINARY, CHAR, VARCHAR, and LONGVARCHAR columns. If the limit is exceeded, the excess data is silently discarded.

HSQLDB-Specific Information:

Up to and including 1.7.2, HSQLDB always returns zero, meaning there is no limit.

Specified by:
getMaxFieldSize in interface Statement
Returns:
the current column size limit for columns storing character and binary values; zero means there is no limit
Throws:
SQLException - if a database access error occurs
See Also:
setMaxFieldSize(int)

setMaxFieldSize

public void setMaxFieldSize(int max)
                     throws SQLException
Sets the limit for the maximum number of bytes in a ResultSet column storing character or binary values to the given number of bytes. This limit applies only to BINARY, VARBINARY, LONGVARBINARY, CHAR, VARCHAR, and LONGVARCHAR fields. If the limit is exceeded, the excess data is silently discarded. For maximum portability, use values greater than 256.

HSQLDB-Specific Information:

Calls to this method are simply ignored; HSQLDB always stores the full number of bytes when dealing with any of the field types mentioned above. These types all have an absolute maximum element upper bound determined by the Java array index limit java.lang.Integer.MAX_VALUE. For XXXBINARY types, this translates to Integer.MAX_VALUE bytes. For XXXCHAR types, this translates to 2 * Integer.MAX_VALUE bytes (2 bytes / character)

Specified by:
setMaxFieldSize in interface Statement
Parameters:
max - the new column size limit in bytes; zero means there is no limit
Throws:
SQLException - if a database access error occurs or the condition max >= 0 is not satisfied
See Also:
getMaxFieldSize()

getMaxRows

public int getMaxRows()
               throws SQLException
Retrieves the maximum number of rows that a ResultSet object produced by this Statement object can contain. If this limit is exceeded, the excess rows are silently dropped.

Specified by:
getMaxRows in interface Statement
Returns:
the current maximum number of rows for a ResultSet object produced by this Statement object; zero means there is no limit
Throws:
SQLException - if a database access error occurs
See Also:
setMaxRows(int)

setMaxRows

public void setMaxRows(int max)
                throws SQLException
Sets the limit for the maximum number of rows that any ResultSet object can contain to the given number. If the limit is exceeded, the excess rows are silently dropped.

Specified by:
setMaxRows in interface Statement
Parameters:
max - the new max rows limit; zero means there is no limit
Throws:
SQLException - if a database access error occurs or the condition max >= 0 is not satisfied
See Also:
getMaxRows()

setEscapeProcessing

public void setEscapeProcessing(boolean enable)
                         throws SQLException
Sets escape processing on or off. If escape scanning is on (the default), the driver will do escape substitution before sending the SQL statement to the database. Note: Since prepared statements have usually been parsed prior to making this call, disabling escape processing for PreparedStatements objects will have no effect.

HSQLDB-Specific Information:

Specified by:
setEscapeProcessing in interface Statement
Parameters:
enable - true to enable escape processing; false to disable it
Throws:
SQLException - if a database access error occurs

getQueryTimeout

public int getQueryTimeout()
                    throws SQLException
Retrieves the number of seconds the driver will wait for a Statement object to execute. If the limit is exceeded, a SQLException is thrown.

HSQLDB-Specific Information:

Up to and including 1.7.2, HSQLDB always returns zero, meaning there is no limit.

Specified by:
getQueryTimeout in interface Statement
Returns:
the current query timeout limit in seconds; zero means there is no limit
Throws:
SQLException - if a database access error occurs
See Also:
setQueryTimeout(int)

setQueryTimeout

public void setQueryTimeout(int seconds)
                     throws SQLException
Sets the number of seconds the driver will wait for a Statement object to execute to the given number of seconds. If the limit is exceeded, an SQLException is thrown.

HSQLDB-Specific Information:

Calls to this method are simply ignored; up to and including 1.7.2, HSQLDB waits an unlimited amount of time for statement execution requests to return.

Specified by:
setQueryTimeout in interface Statement
Parameters:
seconds - the new query timeout limit in seconds; zero means there is no limit
Throws:
SQLException - if a database access error occurs or the condition seconds >= 0 is not satisfied
See Also:
getQueryTimeout()

cancel

public void cancel()
            throws SQLException
Cancels this Statement object if both the DBMS and driver support aborting an SQL statement. This method can be used by one thread to cancel a statement that is being executed by another thread.

HSQLDB-Specific Information:

Up to and including HSQLDB 1.7.2, aborting a SQL statement is not supported, and calls to this method are simply ignored.

Specified by:
cancel in interface Statement
Throws:
SQLException - if a database access error occurs

getWarnings

public SQLWarning getWarnings()
                       throws SQLException
Retrieves the first warning reported by calls on this Statement object. Subsequent Statement object warnings will be chained to this SQLWarning object.

The warning chain is automatically cleared each time a statement is (re)executed. This method may not be called on a closed Statement object; doing so will cause an SQLException to be thrown.

Note: If you are processing a ResultSet object, any warnings associated with reads on that ResultSet object will be chained on it rather than on the Statement object that produced it.

HSQLDB-Specific Information:

Up to and including 1.7.2, HSQLDB never produces Statement warnings and always returns null.

Specified by:
getWarnings in interface Statement
Returns:
the first SQLWarning object or null if there are no warnings
Throws:
SQLException - if a database access error occurs or this method is called on a closed statement

clearWarnings

public void clearWarnings()
                   throws SQLException
Clears all the warnings reported on this Statement object. After a call to this method, the method getWarnings will return null until a new warning is reported for this Statement object.

HSQLDB-Specific Information:

Up to and including HSQLDB 1.7.2, SQLWarning objects are never produced for Statement Objects, and calls to this method are simply ignored.

Specified by:
clearWarnings in interface Statement
Throws:
SQLException - if a database access error occurs

setCursorName

public void setCursorName(String name)
                   throws SQLException
Sets the SQL cursor name to the given String, which will be used by subsequent Statement object execute methods. This name can then be used in SQL positioned update or delete statements to identify the current row in the ResultSet object generated by this statement. If the database does not support positioned update/delete, this method is a noop. To insure that a cursor has the proper isolation level to support updates, the cursor's SELECT statement should have the form SELECT FOR UPDATE. If FOR UPDATE is not present, positioned updates may fail.

Note: By definition, the execution of positioned updates and deletes must be done by a different Statement object than the one that generated the ResultSet object being used for positioning. Also, cursor names must be unique within a connection.

HSQLDB-Specific Information:

Up to and including 1.7.2, HSQLDB does not support named cursors, updateable results or table locking via SELECT FOR UPDATE, so calls to this method are simply ignored.

Specified by:
setCursorName in interface Statement
Parameters:
name - the new cursor name, which must be unique within a connection
Throws:
SQLException - if a database access error occurs

execute

public boolean execute(String sql)
                throws SQLException
Executes the given SQL statement, which may return multiple results. In some (uncommon) situations, a single SQL statement may return multiple result sets and/or update counts. Normally you can ignore this unless you are (1) executing a stored procedure that you know may return multiple results or (2) you are dynamically executing an unknown SQL string.

The execute method executes an SQL statement and indicates the form of the first result. You must then use the methods getResultSet or getUpdateCount to retrieve the result, and getMoreResults to move to any subsequent result(s).

Specified by:
execute in interface Statement
Parameters:
sql - any SQL statement
Returns:
true if the first result is a ResultSet object; false if it is an update count or there are no results
Throws:
SQLException - if a database access error occurs
See Also:
getResultSet(), getUpdateCount(), getMoreResults()

getResultSet

public ResultSet getResultSet()
                       throws SQLException
Retrieves the current result as a ResultSet object. This method should be called only once per result.

HSQLDB-Specific Information:

Calling this method multiple times without interceding calls to executeXXX returns multiple result set instances, each referring to the same result, if any.

Specified by:
getResultSet in interface Statement
Returns:
the current result as a ResultSet object or null if the result is an update count or there are no more results
Throws:
SQLException - if a database access error occurs
See Also:
execute(java.lang.String)

getUpdateCount

public int getUpdateCount()
                   throws SQLException
Retrieves the current result as an update count; if the result is a ResultSet object or there are no more results, -1 is returned. This method should be called only once per result.

Specified by:
getUpdateCount in interface Statement
Returns:
the current result as an update count; -1 if the current result is a ResultSet object or there are no more results
Throws:
SQLException - if a database access error occurs
See Also:
execute(java.lang.String)

getMoreResults

public boolean getMoreResults()
                       throws SQLException
Moves to this Statement object's next result, returns true if it is a ResultSet object, and implicitly closes any current ResultSet object(s) obtained with the method getResultSet.

There are no more results when the following is true: 

    (!getMoreResults() && (getUpdateCount() == -1)

Specified by:
getMoreResults in interface Statement
Returns:
true if the next result is a ResultSet object; false if it is an update count or there are no more results
Throws:
SQLException - if a database access error occurs
See Also:
execute(java.lang.String)

setFetchDirection

public void setFetchDirection(int direction)
                       throws SQLException
Gives the driver a hint as to the direction in which rows will be processed in ResultSet objects created using this Statement object. The default value is ResultSet.FETCH_FORWARD.

Note that this method sets the default fetch direction for result sets generated by this Statement object. Each result set has its own methods for getting and setting its own fetch direction.

HSQLDB-Specific Information:

Up to and including 1.7.2, HSQLDB supports only FETCH_FORWARD.

Setting any other value will throw a SQLException, stating the operation is not supported.

Specified by:
setFetchDirection in interface Statement
Parameters:
direction - the initial direction for processing rows
Throws:
SQLException - if a database access error occurs or the given direction is not one of ResultSet.FETCH_FORWARD, ResultSet.FETCH_REVERSE, or ResultSet.FETCH_UNKNOWN

HSQLDB throws for all values except FETCH_FORWARD

Since:
JDK 1.2 (JDK 1.1.x developers: read the new overview for jdbcStatement)
See Also:
getFetchDirection()

getFetchDirection

public int getFetchDirection()
                      throws SQLException
Retrieves the direction for fetching rows from database tables that is the default for result sets generated from this Statement object. If this Statement object has not set a fetch direction by calling the method setFetchDirection, the return value is implementation-specific.

HSQLDB-Specific Information:

Up to and including 1.7.2, HSQLDB always returns FETCH_FORWARD.

Specified by:
getFetchDirection in interface Statement
Returns:
the default fetch direction for result sets generated from this Statement object
Throws:
SQLException - if a database access error occurs
Since:
JDK 1.2 (JDK 1.1.x developers: read the new overview for jdbcStatement)
See Also:
setFetchDirection(int)

setFetchSize

public void setFetchSize(int rows)
                  throws SQLException
Gives the JDBC driver a hint as to the number of rows that should be fetched from the database when more rows are needed. The number of rows specified affects only result sets created using this statement. If the value specified is zero, then the hint is ignored. The default value is zero.

HSQLDB-Specific Information:

Up to and including HSQLDB 1.7.2, calls to this method are simply ignored; HSQLDB always fetches a result completely as part of executing its statement.

Specified by:
setFetchSize in interface Statement
Parameters:
rows - the number of rows to fetch
Throws:
SQLException - if a database access error occurs, or the condition 0 <= rows <= this.getMaxRows() is not satisfied.

HSQLDB never throws an exception, since calls to this method are always ignored.

Since:
JDK 1.2 (JDK 1.1.x developers: read the new overview for jdbcStatement)
See Also:
getFetchSize()

getFetchSize

public int getFetchSize()
                 throws SQLException
Retrieves the number of result set rows that is the default fetch size for ResultSet objects generated from this Statement object. If this Statement object has not set a fetch size by calling the method setFetchSize, the return value is implementation-specific.

HSQLDB-Specific Information

Up to and including 1.7.2, this method always returns 0. HSQLDB always fetches all rows of a result.

Specified by:
getFetchSize in interface Statement
Returns:
the default fetch size for result sets generated from this Statement object
Throws:
SQLException - if a database access error occurs
Since:
JDK 1.2 (JDK 1.1.x developers: read the new overview for jdbcStatement)
See Also:
setFetchSize(int)

getResultSetConcurrency

public int getResultSetConcurrency()
                            throws SQLException
Retrieves the result set concurrency for ResultSet objects generated by this Statement object.

HSQLDB-Specific Information:

Up to and including 1.7.2, HSQLDB supports only CONCUR_READ_ONLY concurrency.

Specified by:
getResultSetConcurrency in interface Statement
Returns:
either ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE (not supported)
Throws:
SQLException - if a database access error occurs
Since:
JDK 1.2 (JDK 1.1.x developers: read the new overview for jdbcStatement)

getResultSetType

public int getResultSetType()
                     throws SQLException
Retrieves the result set type for ResultSet objects generated by this Statement object.

HSQLDB-Specific Information:

HSQLDB 1.7.0 and later versions support TYPE_FORWARD_ONLY and TYPE_SCROLL_INSENSITIVE.

Specified by:
getResultSetType in interface Statement
Returns:
one of ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE (not supported)

Note: Up to and including 1.7.1, HSQLDB never returns TYPE_SCROLL_SENSITIVE

Throws:
SQLException - if a database access error occurs
Since:
JDK 1.2 (JDK 1.1.x developers: read the new overview for jdbcStatement)

addBatch

public void addBatch(String sql)
              throws SQLException
Adds the given SQL command to the current list of commmands for this Statement object. The commands in this list can be executed as a batch by calling the method executeBatch.

NOTE: This method is optional.

HSQLDB-Specific Information:

Starting with 1.7.2, this feature is supported.

Specified by:
addBatch in interface Statement
Parameters:
sql - typically this is a static SQL INSERT or UPDATE statement
Throws:
SQLException - if a database access error occurs, or the driver does not support batch updates
Since:
JDK 1.2 (JDK 1.1.x developers: read the new overview for jdbcStatement)
See Also:
executeBatch()

clearBatch

public void clearBatch()
                throws SQLException
Empties this Statement object's current list of SQL commands.

NOTE: This method is optional.

HSQLDB-Specific Information:

Starting with HSQLDB 1.7.2, this feature is supported.

Specified by:
clearBatch in interface Statement
Throws:
SQLException - if a database access error occurs or the driver does not support batch updates
Since:
JDK 1.2 (JDK 1.1.x developers: read the new overview for jdbcStatement)
See Also:
addBatch(java.lang.String)

executeBatch

public int[] executeBatch()
                   throws SQLException
Submits a batch of commands to the database for execution and if all commands execute successfully, returns an array of update counts. The int elements of the array that is returned are ordered to correspond to the commands in the batch, which are ordered according to the order in which they were added to the batch. The elements in the array returned by the method executeBatch may be one of the following:
  1. A number greater than or equal to zero -- indicates that the command was processed successfully and is an update count giving the number of rows in the database that were affected by the command's execution
  2. A value of SUCCESS_NO_INFO -- indicates that the command was processed successfully but that the number of rows affected is unknown

    If one of the commands in a batch update fails to execute properly, this method throws a BatchUpdateException, and a JDBC driver may or may not continue to process the remaining commands in the batch. However, the driver's behavior must be consistent with a particular DBMS, either always continuing to process commands or never continuing to process commands. If the driver continues processing after a failure, the array returned by the method BatchUpdateException.getUpdateCounts will contain as many elements as there are commands in the batch, and at least one of the elements will be the following:

  3. A value of EXECUTE_FAILED -- indicates that the command failed to execute successfully and occurs only if a driver continues to process commands after a command fails

A driver is not required to implement this method. The possible implementations and return values have been modified in the Java 2 SDK, Standard Edition, version 1.3 to accommodate the option of continuing to proccess commands in a batch update after a BatchUpdateException obejct has been thrown.

HSQLDB-Specific Information:

Starting with HSQLDB 1.7.2, this feature is supported.

HSQLDB stops execution of commands in a batch when one of the commands results in an exception. The size of the returned array equals the number of commands that were executed successfully.

When the product is built under the JAVA1 and JAVA2 target, an exception is never thrown and is is the responsibility of the client software to check the size of the returned update count array to determine if any batch items failed.

Specified by:
executeBatch in interface Statement
Returns:
an array of update counts containing one element for each command in the batch. The elements of the array are ordered according to the order in which commands were added to the batch.
Throws:
SQLException - if a database access error occurs or the driver does not support batch statements. Throws BatchUpdateException (a subclass of java.sql.SQLException) if one of the commands sent to the database fails to execute properly or attempts to return a result set.
Since:
JDK 1.3 (JDK 1.1.x developers: read the new overview for jdbcStatement)

getConnection

public Connection getConnection()
                         throws SQLException
Retrieves the Connection object that produced this Statement object.

Specified by:
getConnection in interface Statement
Returns:
the connection that produced this statement
Throws:
SQLException - if a database access error occurs
Since:
JDK 1.2 (JDK 1.1.x developers: read the new overview for jdbcStatement)

getMoreResults

public boolean getMoreResults(int current)
                       throws SQLException
Moves to this Statement object's next result, deals with any current ResultSet object(s) according to the instructions specified by the given flag, and returns true if the next result is a ResultSet object.

There are no more results when the following is true: 

   (!getMoreResults() && (getUpdateCount() == -1)

HSQLDB-Specific Information:

HSQLDB 1.7.2 does not support this feature.

Calling this method always throws a SQLException, stating that the function is not supported.

Specified by:
getMoreResults in interface Statement
Parameters:
current - one of the following Statement constants indicating what should happen to current ResultSet objects obtained using the method getResultSetCLOSE_CURRENT_RESULT, KEEP_CURRENT_RESULT, or CLOSE_ALL_RESULTS
Returns:
true if the next result is a ResultSet object; false if it is an update count or there are no more results
Throws:
SQLException - if a database access error occurs
Since:
JDK 1.4, HSQLDB 1.7
See Also:
execute(java.lang.String)

getGeneratedKeys

public ResultSet getGeneratedKeys()
                           throws SQLException
Retrieves any auto-generated keys created as a result of executing this Statement object. If this Statement object did not generate any keys, an empty ResultSet object is returned.

HSQLDB-Specific Information:

HSQLDB 1.7.2 does not support this feature.

Calling this method always throws a SQLException, stating that the function is not supported.

Specified by:
getGeneratedKeys in interface Statement
Returns:
a ResultSet object containing the auto-generated key(s) generated by the execution of this Statement object
Throws:
SQLException - if a database access error occurs
Since:
JDK 1.4, HSQLDB 1.7

executeUpdate

public int executeUpdate(String sql,
                         int autoGeneratedKeys)
                  throws SQLException
Executes the given SQL statement and signals the driver with the given flag about whether the auto-generated keys produced by this Statement object should be made available for retrieval.

HSQLDB-Specific Information:

HSQLDB 1.7.2 does not support this feature.

Calling this method always throws a SQLException, stating that the function is not supported.

Specified by:
executeUpdate in interface Statement
Parameters:
sql - must be an SQL INSERT, UPDATE or DELETE statement or an SQL statement that returns nothing
autoGeneratedKeys - a flag indicating whether auto-generated keys should be made available for retrieval; one of the following constants: Statement.RETURN_GENERATED_KEYS Statement.NO_GENERATED_KEYS
Returns:
either the row count for INSERT, UPDATE or DELETE statements, or 0 for SQL statements that return nothing
Throws:
SQLException - if a database access error occurs, the given SQL statement returns a ResultSet object, or the given constant is not one of those allowed
Since:
JDK 1.4, HSQLDB 1.7

executeUpdate

public int executeUpdate(String sql,
                         int[] columnIndexes)
                  throws SQLException
Executes the given SQL statement and signals the driver that the auto-generated keys indicated in the given array should be made available for retrieval. The driver will ignore the array if the SQL statement is not an INSERT statement.

HSQLDB-Specific Information:

HSQLDB 1.7.2 does not support this feature.

Calling this method always throws a SQLException, stating that the function is not supported.

Specified by:
executeUpdate in interface Statement
Parameters:
sql - an SQL INSERT, UPDATE or DELETE statement or an SQL statement that returns nothing, such as an SQL DDL statement
columnIndexes - an array of column indexes indicating the columns that should be returned from the inserted row
Returns:
either the row count for INSERT, UPDATE, or DELETE statements, or 0 for SQL statements that return nothing
Throws:
SQLException - if a database access error occurs or the SQL statement returns a ResultSet object
Since:
JDK 1.4, HSQLDB 1.7

executeUpdate

public int executeUpdate(String sql,
                         String[] columnNames)
                  throws SQLException
Executes the given SQL statement and signals the driver that the auto-generated keys indicated in the given array should be made available for retrieval. The driver will ignore the array if the SQL statement is not an INSERT statement.

HSQLDB-Specific Information:

HSQLDB 1.7.2 does not support this feature.

Calling this method always throws a SQLException, stating that the function is not supported.

Specified by:
executeUpdate in interface Statement
Parameters:
sql - an SQL INSERT, UPDATE or DELETE statement or an SQL statement that returns nothing
columnNames - an array of the names of the columns that should be returned from the inserted row
Returns:
either the row count for INSERT, UPDATE, or DELETE statements, or 0 for SQL statements that return nothing
Throws:
SQLException - if a database access error occurs
Since:
JDK 1.4, HSQLDB 1.7

execute

public boolean execute(String sql,
                       int autoGeneratedKeys)
                throws SQLException
Executes the given SQL statement, which may return multiple results, and signals the driver that any auto-generated keys should be made available for retrieval. The driver will ignore this signal if the SQL statement is not an INSERT statement.

In some (uncommon) situations, a single SQL statement may return multiple result sets and/or update counts. Normally you can ignore this unless you are (1) executing a stored procedure that you know may return multiple results or (2) you are dynamically executing an unknown SQL string.

The execute method executes an SQL statement and indicates the form of the first result. You must then use the methods getResultSet or getUpdateCount to retrieve the result, and getMoreResults to move to any subsequent result(s).

HSQLDB-Specific Information:

HSQLDB 1.7.2 does not support this feature.

Calling this method always throws a SQLException, stating that the function is not supported.

Specified by:
execute in interface Statement
Parameters:
sql - any SQL statement
autoGeneratedKeys - a constant indicating whether auto-generated keys should be made available for retrieval using the method getGeneratedKeys; one of the following constants: Statement.RETURN_GENERATED_KEYS or Statement.NO_GENERATED_KEYS
Returns:
true if the first result is a ResultSet object; false if it is an update count or there are no results
Throws:
SQLException - if a database access error occurs
Since:
JDK 1.4, HSQLDB 1.7
See Also:
getResultSet(), getUpdateCount(), getMoreResults(), getGeneratedKeys()

execute

public boolean execute(String sql,
                       int[] columnIndexes)
                throws SQLException
Executes the given SQL statement, which may return multiple results, and signals the driver that the auto-generated keys indicated in the given array should be made available for retrieval. This array contains the indexes of the columns in the target table that contain the auto-generated keys that should be made available. The driver will ignore the array if the given SQL statement is not an INSERT statement.

Under some (uncommon) situations, a single SQL statement may return multiple result sets and/or update counts. Normally you can ignore this unless you are (1) executing a stored procedure that you know may return multiple results or (2) you are dynamically executing an unknown SQL string.

The execute method executes an SQL statement and indicates the form of the first result. You must then use the methods getResultSet or getUpdateCount to retrieve the result, and getMoreResults to move to any subsequent result(s).

HSQLDB-Specific Information:

HSQLDB 1.7.2 does not support this feature.

Calling this method always throws a SQLException, stating that the function is not supported.

Specified by:
execute in interface Statement
Parameters:
sql - any SQL statement
columnIndexes - an array of the indexes of the columns in the inserted row that should be made available for retrieval by a call to the method getGeneratedKeys
Returns:
true if the first result is a ResultSet object; false if it is an update count or there are no results
Throws:
SQLException - if a database access error occurs
Since:
JDK 1.4, HSQLDB 1.7
See Also:
getResultSet(), getUpdateCount(), getMoreResults()

execute

public boolean execute(String sql,
                       String[] columnNames)
                throws SQLException
Executes the given SQL statement, which may return multiple results, and signals the driver that the auto-generated keys indicated in the given array should be made available for retrieval. This array contains the names of the columns in the target table that contain the auto-generated keys that should be made available. The driver will ignore the array if the given SQL statement is not an INSERT statement.

In some (uncommon) situations, a single SQL statement may return multiple result sets and/or update counts. Normally you can ignore this unless you are (1) executing a stored procedure that you know may return multiple results or (2) you are dynamically executing an unknown SQL string.

The execute method executes an SQL statement and indicates the form of the first result. You must then use the methods getResultSet or getUpdateCount to retrieve the result, and getMoreResults to move to any subsequent result(s).

HSQLDB-Specific Information:

HSQLDB 1.7.2 does not support this feature.

Calling this method always throws a SQLException, stating that the function is not supported.

Specified by:
execute in interface Statement
Parameters:
sql - any SQL statement
columnNames - an array of the names of the columns in the inserted row that should be made available for retrieval by a call to the method getGeneratedKeys
Returns:
true if the next result is a ResultSet object; false if it is an update count or there are no more results
Throws:
SQLException - if a database access error occurs
Since:
JDK 1.4, HSQLDB 1.7
See Also:
getResultSet(), getUpdateCount(), getMoreResults(), getGeneratedKeys()

getResultSetHoldability

public int getResultSetHoldability()
                            throws SQLException
Retrieves the result set holdability for ResultSet objects generated by this Statement object.

HSQLDB-Specific Information:

Starting with 1.7.2, this method returns HOLD_CURSORS_OVER_COMMIT

Specified by:
getResultSetHoldability in interface Statement
Returns:
either ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT
Throws:
SQLException - if a database access error occurs
Since:
JDK 1.4, HSQLDB 1.7
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