org.objectweb.cjdbc.driver
Class Statement

java.lang.Object
  org.objectweb.cjdbc.driver.Statement

All Implemented Interfaces:

java.sql.Statement

Direct Known Subclasses:

PreparedStatement

public class Statement

extends java.lang.Object

implements java.sql.Statement

A Statement object is used for executing a static SQL statement and obtaining the results produced by it.

Only one ResultSet per Statement can be open at any point in time. Therefore, if the reading of one ResultSet is interleaved with the reading of another, each must have been generated by different Statements. All Statements execute methods implicitly close a statement's current ResultSet if an open one exists.

Version:

1.0

Author:

Emmanuel Cecchet , Vadim Kassin

See Also:

Statement, DriverResultSet

Field Summary

private java.util.Vector	batch Vector for batch commands
protected Connection	connection The connection that created us
private java.lang.String	cursorName Cursor name used jointly with fetch size
protected boolean	escapeProcessing Should the driver to escape processing before sending to the DB?
private int	fetchSize Default ResultSet fetch size
protected java.sql.ResultSet	generatedKeys Auto generated keys
protected int	generatedKeysFlag
private int	maxFieldSize Maximum field size (unused)
private int	maxRows Maximum number of rows (unused)
protected java.sql.ResultSet	result The current result for a read request
private int	resultSetType Type of the ResultSet defaults to TYPE_FORWARD_ONLY
private int	timeout Query timeout in seconds (0 means no timeout)
protected int	updateCount The update count for a write request
private java.sql.SQLWarning	warnings The warnings chain

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

Constructor Summary

Statement(Connection c)
Creates a new Statement instance.

Method Summary

void	addBatch(java.lang.String sql) Adds sql to the current list of commands.
void	cancel() Could be use by one thread to cancel a statement that is being executed by another thread.
void	clearBatch() Empties the current list of commands.
void	clearWarnings() After this call, getWarnings returns null until a new warning is reported for this Statement.
void	close() In many cases, it is desirable to immediately release a Statement's database and JDBC resources instead of waiting for this to happen when it is automatically closed.
boolean	execute(java.lang.String sql) Execute a SQL statement that may return multiple results.
boolean	execute(java.lang.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(java.lang.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(java.lang.String sql, java.lang.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() Execute a batch of commands
java.sql.ResultSet	executeQuery(java.lang.String sql) Execute a SQL statement that returns a single ResultSet
protected java.sql.ResultSet	executeQuery(java.lang.String sqlSkeleton, java.lang.String sqlQuery) Execute a SQL statement that returns a single ResultSet
int	executeUpdate(java.lang.String sql) Execute a SQL INSERT, UPDATE or DELETE statement.
int	executeUpdate(java.lang.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(java.lang.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(java.lang.String sql, java.lang.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.
protected int	executeUpdateWithSkeleton(java.lang.String sqlSkeleton, java.lang.String sqlQuery) Execute a SQL INSERT, UPDATE or DELETE statement.
java.sql.Connection	getConnection() Retrieve the connection that created this Statement object
int	getFetchDirection() Not supported yet.
int	getFetchSize()
java.sql.ResultSet	getGeneratedKeys() Retrieves any auto-generated keys created as a result of executing this Statement object.
int	getMaxFieldSize() The maxFieldSize limit (in bytes) is the maximum amount of data returned for any column value; it only applies to BINARY, VARBINARY,LONGVARBINARY,CHAR, VARCHAR and LONGVARCHAR columns.
int	getMaxRows() The maxRows limit is set to limit the number of rows that any ResultSet can contain.
boolean	getMoreResults() Multiple results are not suppoted so this method always return false and reset the update count to -1.
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() The queryTimeout limit is the number of seconds the driver will wait for a Statement to execute.
java.sql.ResultSet	getResultSet() Returns the current result as a ResultSet.
int	getResultSetConcurrency() Retrieve the concurrency mode for the ResultSet.
int	getResultSetHoldability() Retrieves the result set holdability for ResultSet objects generated by this Statement object.
int	getResultSetType() Retrieve the type of the generated ResultSet.
int	getUpdateCount() Returns the current result as an update count, if the result is a ResultSet or there are no more results, -1 is returned.
java.sql.SQLWarning	getWarnings() The first warning reported by calls on this Statement is returned.
void	setCursorName(java.lang.String name) Defines the SQL cursor name that will be used by subsequent execute methods.
void	setEscapeProcessing(boolean enable) If escape scanning is on (the default), the driver will do escape substitution before sending the SQL to the database.
void	setFetchDirection(int direction) This hint is silently ignored and assumes FETCH_FORWARD which is the way C-JDBC has been optimized for.
void	setFetchSize(int rows) Set the default fetch size for the produced ResultSet.
void	setMaxFieldSize(int max) Sets the maxFieldSize.
void	setMaxRows(int max) Sets the maximum number of rows.
void	setQueryTimeout(int seconds) Sets the queryTimeout limit.
void	setResultSetConcurrency(int value)
void	setResultSetType(int value)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

connection

protected Connection connection

The connection that created us

batch

private java.util.Vector batch

Vector for batch commands

warnings

private java.sql.SQLWarning warnings

The warnings chain

result

protected java.sql.ResultSet result

The current result for a read request

updateCount

protected int updateCount

The update count for a write request

timeout

private int timeout

Query timeout in seconds (0 means no timeout)

fetchSize

private int fetchSize

Default ResultSet fetch size

cursorName

private java.lang.String cursorName

Cursor name used jointly with fetch size

resultSetType

private int resultSetType

Type of the ResultSet defaults to TYPE_FORWARD_ONLY

maxFieldSize

private int maxFieldSize

Maximum field size (unused)

maxRows

private int maxRows

Maximum number of rows (unused)

escapeProcessing

protected boolean escapeProcessing

Should the driver to escape processing before sending to the DB?

generatedKeys

protected java.sql.ResultSet generatedKeys

Auto generated keys

generatedKeysFlag

protected int generatedKeysFlag

Constructor Detail

Statement

public Statement(Connection c)

Creates a new Statement instance.

Parameters:

c - the Connection that created us

Method Detail

addBatch

public void addBatch(java.lang.String sql)
              throws java.sql.SQLException

Adds sql to the current list of commands.

Specified by:

addBatch in interface java.sql.Statement

Parameters:

sql - an SQL statement that returns an update count (INSERT or UPDATE)

Throws:

java.sql.SQLException - if an error occurs

cancel

public void cancel()
            throws java.sql.SQLException

Could be use by one thread to cancel a statement that is being executed by another thread. We don't support that for instance.

Specified by:

cancel in interface java.sql.Statement

Throws:

java.sql.SQLException - if an error occurs

clearBatch

public void clearBatch()
                throws java.sql.SQLException

Empties the current list of commands.

Specified by:

clearBatch in interface java.sql.Statement

Throws:

java.sql.SQLException - if an error occurs

clearWarnings

public void clearWarnings()
                   throws java.sql.SQLException

After this call, getWarnings returns null until a new warning is reported for this Statement.

Specified by:

clearWarnings in interface java.sql.Statement

Throws:

java.sql.SQLException - if a database access error occurs (why?)

executeBatch

public int[] executeBatch()
                   throws java.sql.SQLException

Execute a batch of commands

Specified by:

executeBatch in interface java.sql.Statement

Returns:

an array containing update count that corresponding to the commands that executed successfully

Throws:

java.sql.SQLException - if an error occurs

close

public void close()
           throws java.sql.SQLException

In many cases, it is desirable to immediately release a Statement's database and JDBC resources instead of waiting for this to happen when it is automatically closed. The close method provides this immediate release.

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

Specified by:

close in interface java.sql.Statement

Throws:

java.sql.SQLException - if a database access error occurs (why?)

execute

public boolean execute(java.lang.String sql)
                throws java.sql.SQLException

Execute a SQL statement that may return multiple results.

Specified by:

execute in interface java.sql.Statement

Parameters:

sql - any SQL statement

Returns:

true if the result is a ResultSet or false if it is an integer

Throws:

java.sql.SQLException - if an error occurs

executeQuery

public java.sql.ResultSet executeQuery(java.lang.String sql)
                                throws java.sql.SQLException

Execute a SQL statement that returns a single ResultSet

Specified by:

executeQuery in interface java.sql.Statement

Parameters:

sql - typically a static SQL SELECT statement

Returns:

a ResulSet that contains the data produced by the query

Throws:

java.sql.SQLException - if a database access error occurs

executeQuery

protected java.sql.ResultSet executeQuery(java.lang.String sqlSkeleton,
                                          java.lang.String sqlQuery)
                                   throws java.sql.SQLException

Execute a SQL statement that returns a single ResultSet

Parameters:

sqlSkeleton - the SQL request squeleton or null

sqlQuery - typically a static SQL SELECT statement that is already trimed

Returns:

a ResulSet that contains the data produced by the query

Throws:

java.sql.SQLException - if a database access error occurs

executeUpdate

public int executeUpdate(java.lang.String sql)
                  throws java.sql.SQLException

Execute a SQL INSERT, UPDATE or DELETE statement. In addition SQL statements that return nothing such as SQL DDL statements can be executed

Specified by:

executeUpdate in interface java.sql.Statement

Parameters:

sql - a SQL statement

Returns:

either a row count, or 0 for SQL commands

Throws:

java.sql.SQLException - if a database access error occurs

executeUpdateWithSkeleton

protected int executeUpdateWithSkeleton(java.lang.String sqlSkeleton,
                                        java.lang.String sqlQuery)
                                 throws java.sql.SQLException

Execute a SQL INSERT, UPDATE or DELETE statement. In addition SQL statements that return nothing such as SQL DDL statements can be executed

Parameters:

sqlSkeleton - the SQL request squeleton or null

sqlQuery - a static SQL statement that is already trimed

Returns:

either a row count, or 0 for SQL commands

Throws:

java.sql.SQLException - if a database access error occurs

getConnection

public java.sql.Connection getConnection()
                                  throws java.sql.SQLException

Retrieve the connection that created this Statement object

Specified by:

getConnection in interface java.sql.Statement

Returns:

a java.sql.Connection object

Throws:

java.sql.SQLException - never

getFetchDirection

public int getFetchDirection()
                      throws java.sql.SQLException

Not supported yet.

Specified by:

getFetchDirection in interface java.sql.Statement

Returns:

nothing

Throws:

java.sql.SQLException - not supported

getFetchSize

public int getFetchSize()
                 throws java.sql.SQLException

Specified by:

getFetchSize in interface java.sql.Statement

Throws:

java.sql.SQLException

See Also:

Statement.getFetchSize()

getMaxFieldSize

public int getMaxFieldSize()
                    throws java.sql.SQLException

The maxFieldSize limit (in bytes) is the maximum amount of data returned for any column value; it only applies to BINARY, VARBINARY,LONGVARBINARY,CHAR, VARCHAR and LONGVARCHAR columns. If the limit is exceeded, the excess data is silently discarded.

Note: We don't do anything with this value yet.

Specified by:

getMaxFieldSize in interface java.sql.Statement

Returns:

the current max column size limit; zero means unlimited

Throws:

java.sql.SQLException - if a database access error occurs

getMaxRows

public int getMaxRows()
               throws java.sql.SQLException

The maxRows limit is set to limit the number of rows that any ResultSet can contain. If the limit is exceeded, the excess rows are silently dropped.

Specified by:

getMaxRows in interface java.sql.Statement

Returns:

the current maximum row limit; zero means unlimited

Throws:

java.sql.SQLException - if a database access error occurs

getMoreResults

public boolean getMoreResults()
                       throws java.sql.SQLException

Multiple results are not suppoted so this method always return false and reset the update count to -1. Any open ResultSet is implicitly closed.

Specified by:

getMoreResults in interface java.sql.Statement

Returns:

false

Throws:

java.sql.SQLException - if an error occurs

getQueryTimeout

public int getQueryTimeout()
                    throws java.sql.SQLException

The queryTimeout limit is the number of seconds the driver will wait for a Statement to execute. If the limit is exceeded, a SQLException is thrown.

Specified by:

getQueryTimeout in interface java.sql.Statement

Returns:

the current query timeout limit in seconds; 0 = unlimited

Throws:

java.sql.SQLException - if a database access error occurs

getResultSet

public java.sql.ResultSet getResultSet()
                                throws java.sql.SQLException

Returns the current result as a ResultSet.

Specified by:

getResultSet in interface java.sql.Statement

Returns:

the current result set; null if there are no more

Throws:

java.sql.SQLException - never

getResultSetConcurrency

public int getResultSetConcurrency()
                            throws java.sql.SQLException

Retrieve the concurrency mode for the ResultSet.

Specified by:

getResultSetConcurrency in interface java.sql.Statement

Returns:

CONCUR_READ_ONLY

Throws:

java.sql.SQLException - never

getResultSetType

public int getResultSetType()
                     throws java.sql.SQLException

Retrieve the type of the generated ResultSet.

Specified by:

getResultSetType in interface java.sql.Statement

Returns:

one of TYPE_FORWARD_ONLY or TYPE_SCROLL_INSENSITIVE

Throws:

java.sql.SQLException - never

getUpdateCount

public int getUpdateCount()
                   throws java.sql.SQLException

Returns the current result as an update count, if the result is a ResultSet or there are no more results, -1 is returned. It should only be called once per result.

Specified by:

getUpdateCount in interface java.sql.Statement

Returns:

the current result as an update count.

Throws:

java.sql.SQLException - if a database access error occurs

getWarnings

public java.sql.SQLWarning getWarnings()
                                throws java.sql.SQLException

The first warning reported by calls on this Statement is returned. A Statement's execute methods clear its SQLWarning chain. Subsequent Statement warnings will be chained to this SQLWarning.

The Warning chain is automatically cleared each time a statement is (re)executed.

Note: if you are processing a ResultSet then any warnings associated with ResultSet reads will be chained on the ResultSet object.

Specified by:

getWarnings in interface java.sql.Statement

Returns:

the first SQLWarning on null

Throws:

java.sql.SQLException - if a database access error occurs

setCursorName

public void setCursorName(java.lang.String name)
                   throws java.sql.SQLException

Defines the SQL cursor name that will be used by subsequent execute methods. This name can then be used in SQL positioned update/delete statements to identify the current row in the ResultSet generated by this statement. If a database doesn't support positioned update/delete, this method is a no-op.

Specified by:

setCursorName in interface java.sql.Statement

Parameters:

name - the new cursor name

Throws:

java.sql.SQLException - not supported

setEscapeProcessing

public void setEscapeProcessing(boolean enable)
                         throws java.sql.SQLException

If escape scanning is on (the default), the driver will do escape substitution before sending the SQL to the database.

Specified by:

setEscapeProcessing in interface java.sql.Statement

Parameters:

enable - true to enable; false to disable

Throws:

java.sql.SQLException - if a database access error occurs

setFetchDirection

public void setFetchDirection(int direction)
                       throws java.sql.SQLException

This hint is silently ignored and assumes FETCH_FORWARD which is the way C-JDBC has been optimized for.

Specified by:

setFetchDirection in interface java.sql.Statement

Parameters:

direction - ignored

Throws:

java.sql.SQLException - not supported

setFetchSize

public void setFetchSize(int rows)
                  throws java.sql.SQLException

Set the default fetch size for the produced ResultSet.

Specified by:

setFetchSize in interface java.sql.Statement

Parameters:

rows - ignored

Throws:

java.sql.SQLException - not supported

setMaxFieldSize

public void setMaxFieldSize(int max)
                     throws java.sql.SQLException

Sets the maxFieldSize.

Specified by:

setMaxFieldSize in interface java.sql.Statement

Parameters:

max - the new max column size limit; 0 means unlimited

Throws:

java.sql.SQLException - if a database access error occurs

setMaxRows

public void setMaxRows(int max)
                throws java.sql.SQLException

Sets the maximum number of rows.

Specified by:

setMaxRows in interface java.sql.Statement

Parameters:

max - the new max rows limit; 0 means unlimited

Throws:

java.sql.SQLException - if a database access error occurs

setQueryTimeout

public void setQueryTimeout(int seconds)
                     throws java.sql.SQLException

Sets the queryTimeout limit.

Specified by:

setQueryTimeout in interface java.sql.Statement

Parameters:

seconds - the new query timeout limit in seconds (0 means no timeout)

Throws:

java.sql.SQLException - if a database access error occurs

setResultSetConcurrency

public void setResultSetConcurrency(int value)
                             throws java.sql.SQLException

Parameters:

value - an int value

Throws:

java.sql.SQLException - if an error occurs

setResultSetType

public void setResultSetType(int value)
                      throws java.sql.SQLException

Parameters:

value - an int value

Throws:

java.sql.SQLException - if an error occurs

getMoreResults

public boolean getMoreResults(int current)
                       throws java.sql.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)
       
      
     
    
   
  
 

Specified by:

getMoreResults in interface java.sql.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:

java.sql.SQLException - if a database access error occurs

Since:

JDK 1.4

See Also:

execute(String)

getGeneratedKeys

public java.sql.ResultSet getGeneratedKeys()
                                    throws java.sql.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.

Specified by:

getGeneratedKeys in interface java.sql.Statement

Returns:

a ResultSet object containing the auto-generated key(s) generated by the execution of this Statement object

Throws:

java.sql.SQLException - if a database access error occurs

Since:

JDK 1.4

executeUpdate

public int executeUpdate(java.lang.String sql,
                         int autoGeneratedKeys)
                  throws java.sql.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.

Specified by:

executeUpdate in interface java.sql.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:

java.sql.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

executeUpdate

public int executeUpdate(java.lang.String sql,
                         int[] columnIndexes)
                  throws java.sql.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.

Specified by:

executeUpdate in interface java.sql.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:

java.sql.SQLException - if a database access error occurs or the SQL statement returns a ResultSet object

Since:

JDK 1.4

executeUpdate

public int executeUpdate(java.lang.String sql,
                         java.lang.String[] columnNames)
                  throws java.sql.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.

Specified by:

executeUpdate in interface java.sql.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:

java.sql.SQLException - if a database access error occurs

Since:

JDK 1.4

execute

public boolean execute(java.lang.String sql,
                       int autoGeneratedKeys)
                throws java.sql.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).

Specified by:

execute in interface java.sql.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:

java.sql.SQLException - if a database access error occurs

Since:

JDK 1.4

See Also:

getResultSet(), getUpdateCount(), getMoreResults(), getGeneratedKeys()

execute

public boolean execute(java.lang.String sql,
                       int[] columnIndexes)
                throws java.sql.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).

Specified by:

execute in interface java.sql.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:

java.sql.SQLException - if a database access error occurs

Since:

JDK 1.4

See Also:

getResultSet(), getUpdateCount(), getMoreResults()

execute

public boolean execute(java.lang.String sql,
                       java.lang.String[] columnNames)
                throws java.sql.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).

Specified by:

execute in interface java.sql.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:

java.sql.SQLException - if a database access error occurs

Since:

JDK 1.4

See Also:

getResultSet(), getUpdateCount(), getMoreResults(), getGeneratedKeys()

getResultSetHoldability

public int getResultSetHoldability()
                            throws java.sql.SQLException

Retrieves the result set holdability for ResultSet objects generated by this Statement object.

Specified by:

getResultSetHoldability in interface java.sql.Statement

Returns:

either ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT

Throws:

java.sql.SQLException - if a database access error occurs

Since:

JDK 1.4