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java.sql
Interface Connection

public interface Connection

A connection (session) with a specific database. SQL statements are executed and results are returned within the context of a connection.

A Connection object's database is able to provide information describing its tables, its supported SQL grammar, its stored procedures, the capabilities of this connection, and so on. This information is obtained with the getMetaData method.

Note: By default a Connection object is in auto-commit mode, which means that it automatically commits changes after executing each statement. If auto-commit mode has been disabled, the method commit must be called explicitly in order to commit changes; otherwise, database changes will not be saved.

A new Connection object created using the JDBC 2.1 core API has an initially empty type map associated with it. A user may enter a custom mapping for a UDT in this type map. When a UDT is retrieved from a data source with the method ResultSet.getObject, the getObject method will check the connection's type map to see if there is an entry for that UDT. If so, the getObject method will map the UDT to the class indicated. If there is no entry, the UDT will be mapped using the standard mapping.

A user may create a new type map, which is a java.util.Map object, make an entry in it, and pass it to the java.sql methods that can perform custom mapping. In this case, the method will use the given type map instead of the one associated with the connection.

For example, the following code fragment specifies that the SQL type ATHLETES will be mapped to the class Athletes in the Java programming language. The code fragment retrieves the type map for the Connection object con, inserts the entry into it, and then sets the type map with the new entry as the connection's type map. 

      java.util.Map map = con.getTypeMap();
      map.put("mySchemaName.ATHLETES", Class.forName("Athletes"));
      con.setTypeMap(map);

See Also:
DriverManager.getConnection(java.lang.String, java.util.Properties) sample code for java.sql.DriverManager.getConnection(java.lang.String, java.util.Properties) definition code for java.sql.DriverManager.getConnection(java.lang.String, java.util.Properties) , Statement sample code for java.sql.Statement definition code for java.sql.Statement , ResultSet sample code for java.sql.ResultSet definition code for java.sql.ResultSet , DatabaseMetaData sample code for java.sql.DatabaseMetaData definition code for java.sql.DatabaseMetaData

Field Summary
static int TRANSACTION_NONE sample code for java.sql.Connection.TRANSACTION_NONE definition code for java.sql.Connection.TRANSACTION_NONE
          A constant indicating that transactions are not supported.
static int TRANSACTION_READ_COMMITTED sample code for java.sql.Connection.TRANSACTION_READ_COMMITTED definition code for java.sql.Connection.TRANSACTION_READ_COMMITTED
          A constant indicating that dirty reads are prevented; non-repeatable reads and phantom reads can occur.
static int TRANSACTION_READ_UNCOMMITTED sample code for java.sql.Connection.TRANSACTION_READ_UNCOMMITTED definition code for java.sql.Connection.TRANSACTION_READ_UNCOMMITTED
          A constant indicating that dirty reads, non-repeatable reads and phantom reads can occur.
static int TRANSACTION_REPEATABLE_READ sample code for java.sql.Connection.TRANSACTION_REPEATABLE_READ definition code for java.sql.Connection.TRANSACTION_REPEATABLE_READ
          A constant indicating that dirty reads and non-repeatable reads are prevented; phantom reads can occur.
static int TRANSACTION_SERIALIZABLE sample code for java.sql.Connection.TRANSACTION_SERIALIZABLE definition code for java.sql.Connection.TRANSACTION_SERIALIZABLE
          A constant indicating that dirty reads, non-repeatable reads and phantom reads are prevented.
 
Method Summary
 void clearWarnings sample code for java.sql.Connection.clearWarnings() definition code for java.sql.Connection.clearWarnings() ()
          Clears all warnings reported for this Connection object.
 void close sample code for java.sql.Connection.close() definition code for java.sql.Connection.close() ()
          Releases this Connection object's database and JDBC resources immediately instead of waiting for them to be automatically released.
 void commit sample code for java.sql.Connection.commit() definition code for java.sql.Connection.commit() ()
          Makes all changes made since the previous commit/rollback permanent and releases any database locks currently held by this Connection object.
 Statement sample code for java.sql.Statement definition code for java.sql.Statement createStatement sample code for java.sql.Connection.createStatement() definition code for java.sql.Connection.createStatement() ()
          Creates a Statement object for sending SQL statements to the database.
 Statement sample code for java.sql.Statement definition code for java.sql.Statement createStatement sample code for java.sql.Connection.createStatement(int, int) definition code for java.sql.Connection.createStatement(int, int) (int resultSetType, int resultSetConcurrency)
          Creates a Statement object that will generate ResultSet objects with the given type and concurrency.
 Statement sample code for java.sql.Statement definition code for java.sql.Statement createStatement sample code for java.sql.Connection.createStatement(int, int, int) definition code for java.sql.Connection.createStatement(int, int, int) (int resultSetType, int resultSetConcurrency, int resultSetHoldability)
          Creates a Statement object that will generate ResultSet objects with the given type, concurrency, and holdability.
 boolean getAutoCommit sample code for java.sql.Connection.getAutoCommit() definition code for java.sql.Connection.getAutoCommit() ()
          Retrieves the current auto-commit mode for this Connection object.
 String sample code for java.lang.String definition code for java.lang.String getCatalog sample code for java.sql.Connection.getCatalog() definition code for java.sql.Connection.getCatalog() ()
          Retrieves this Connection object's current catalog name.
 int getHoldability sample code for java.sql.Connection.getHoldability() definition code for java.sql.Connection.getHoldability() ()
          Retrieves the current holdability of ResultSet objects created using this Connection object.
 DatabaseMetaData sample code for java.sql.DatabaseMetaData definition code for java.sql.DatabaseMetaData getMetaData sample code for java.sql.Connection.getMetaData() definition code for java.sql.Connection.getMetaData() ()
          Retrieves a DatabaseMetaData object that contains metadata about the database to which this Connection object represents a connection.
 int getTransactionIsolation sample code for java.sql.Connection.getTransactionIsolation() definition code for java.sql.Connection.getTransactionIsolation() ()
          Retrieves this Connection object's current transaction isolation level.
 Map sample code for java.util.Map definition code for java.util.Map <String sample code for java.lang.String definition code for java.lang.String ,Class sample code for java.lang.Class definition code for java.lang.Class <?>> getTypeMap sample code for java.sql.Connection.getTypeMap() definition code for java.sql.Connection.getTypeMap() ()
          Retrieves the Map object associated with this Connection object.
 SQLWarning sample code for java.sql.SQLWarning definition code for java.sql.SQLWarning getWarnings sample code for java.sql.Connection.getWarnings() definition code for java.sql.Connection.getWarnings() ()
          Retrieves the first warning reported by calls on this Connection object.
 boolean isClosed sample code for java.sql.Connection.isClosed() definition code for java.sql.Connection.isClosed() ()
          Retrieves whether this Connection object has been closed.
 boolean isReadOnly sample code for java.sql.Connection.isReadOnly() definition code for java.sql.Connection.isReadOnly() ()
          Retrieves whether this Connection object is in read-only mode.
 String sample code for java.lang.String definition code for java.lang.String nativeSQL sample code for java.sql.Connection.nativeSQL(java.lang.String) definition code for java.sql.Connection.nativeSQL(java.lang.String) (String sample code for java.lang.String definition code for java.lang.String  sql)
          Converts the given SQL statement into the system's native SQL grammar.
 CallableStatement sample code for java.sql.CallableStatement definition code for java.sql.CallableStatement prepareCall sample code for java.sql.Connection.prepareCall(java.lang.String) definition code for java.sql.Connection.prepareCall(java.lang.String) (String sample code for java.lang.String definition code for java.lang.String  sql)
          Creates a CallableStatement object for calling database stored procedures.
 CallableStatement sample code for java.sql.CallableStatement definition code for java.sql.CallableStatement prepareCall sample code for java.sql.Connection.prepareCall(java.lang.String, int, int) definition code for java.sql.Connection.prepareCall(java.lang.String, int, int) (String sample code for java.lang.String definition code for java.lang.String  sql, int resultSetType, int resultSetConcurrency)
          Creates a CallableStatement object that will generate ResultSet objects with the given type and concurrency.
 CallableStatement sample code for java.sql.CallableStatement definition code for java.sql.CallableStatement prepareCall sample code for java.sql.Connection.prepareCall(java.lang.String, int, int, int) definition code for java.sql.Connection.prepareCall(java.lang.String, int, int, int) (String sample code for java.lang.String definition code for java.lang.String  sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability)
          Creates a CallableStatement object that will generate ResultSet objects with the given type and concurrency.
 PreparedStatement sample code for java.sql.PreparedStatement definition code for java.sql.PreparedStatement prepareStatement sample code for java.sql.Connection.prepareStatement(java.lang.String) definition code for java.sql.Connection.prepareStatement(java.lang.String) (String sample code for java.lang.String definition code for java.lang.String  sql)
          Creates a PreparedStatement object for sending parameterized SQL statements to the database.
 PreparedStatement sample code for java.sql.PreparedStatement definition code for java.sql.PreparedStatement prepareStatement sample code for java.sql.Connection.prepareStatement(java.lang.String, int) definition code for java.sql.Connection.prepareStatement(java.lang.String, int) (String sample code for java.lang.String definition code for java.lang.String  sql, int autoGeneratedKeys)
          Creates a default PreparedStatement object that has the capability to retrieve auto-generated keys.
 PreparedStatement sample code for java.sql.PreparedStatement definition code for java.sql.PreparedStatement prepareStatement sample code for java.sql.Connection.prepareStatement(java.lang.String, int[]) definition code for java.sql.Connection.prepareStatement(java.lang.String, int[]) (String sample code for java.lang.String definition code for java.lang.String  sql, int[] columnIndexes)
          Creates a default PreparedStatement object capable of returning the auto-generated keys designated by the given array.
 PreparedStatement sample code for java.sql.PreparedStatement definition code for java.sql.PreparedStatement prepareStatement sample code for java.sql.Connection.prepareStatement(java.lang.String, int, int) definition code for java.sql.Connection.prepareStatement(java.lang.String, int, int) (String sample code for java.lang.String definition code for java.lang.String  sql, int resultSetType, int resultSetConcurrency)
          Creates a PreparedStatement object that will generate ResultSet objects with the given type and concurrency.
 PreparedStatement sample code for java.sql.PreparedStatement definition code for java.sql.PreparedStatement prepareStatement sample code for java.sql.Connection.prepareStatement(java.lang.String, int, int, int) definition code for java.sql.Connection.prepareStatement(java.lang.String, int, int, int) (String sample code for java.lang.String definition code for java.lang.String  sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability)
          Creates a PreparedStatement object that will generate ResultSet objects with the given type, concurrency, and holdability.
 PreparedStatement sample code for java.sql.PreparedStatement definition code for java.sql.PreparedStatement prepareStatement sample code for java.sql.Connection.prepareStatement(java.lang.String, java.lang.String[]) definition code for java.sql.Connection.prepareStatement(java.lang.String, java.lang.String[]) (String sample code for java.lang.String definition code for java.lang.String  sql, String sample code for java.lang.String definition code for java.lang.String [] columnNames)
          Creates a default PreparedStatement object capable of returning the auto-generated keys designated by the given array.
 void releaseSavepoint sample code for java.sql.Connection.releaseSavepoint(java.sql.Savepoint) definition code for java.sql.Connection.releaseSavepoint(java.sql.Savepoint) (Savepoint sample code for java.sql.Savepoint definition code for java.sql.Savepoint  savepoint)
          Removes the given Savepoint object from the current transaction.
 void rollback sample code for java.sql.Connection.rollback() definition code for java.sql.Connection.rollback() ()
          Undoes all changes made in the current transaction and releases any database locks currently held by this Connection object.
 void rollback sample code for java.sql.Connection.rollback(java.sql.Savepoint) definition code for java.sql.Connection.rollback(java.sql.Savepoint) (Savepoint sample code for java.sql.Savepoint definition code for java.sql.Savepoint  savepoint)
          Undoes all changes made after the given Savepoint object was set.
 void setAutoCommit sample code for java.sql.Connection.setAutoCommit(boolean) definition code for java.sql.Connection.setAutoCommit(boolean) (boolean autoCommit)
          Sets this connection's auto-commit mode to the given state.
 void setCatalog sample code for java.sql.Connection.setCatalog(java.lang.String) definition code for java.sql.Connection.setCatalog(java.lang.String) (String sample code for java.lang.String definition code for java.lang.String  catalog)
          Sets the given catalog name in order to select a subspace of this Connection object's database in which to work.
 void setHoldability sample code for java.sql.Connection.setHoldability(int) definition code for java.sql.Connection.setHoldability(int) (int holdability)
          Changes the holdability of ResultSet objects created using this Connection object to the given holdability.
 void setReadOnly sample code for java.sql.Connection.setReadOnly(boolean) definition code for java.sql.Connection.setReadOnly(boolean) (boolean readOnly)
          Puts this connection in read-only mode as a hint to the driver to enable database optimizations.
 Savepoint sample code for java.sql.Savepoint definition code for java.sql.Savepoint setSavepoint sample code for java.sql.Connection.setSavepoint() definition code for java.sql.Connection.setSavepoint() ()
          Creates an unnamed savepoint in the current transaction and returns the new Savepoint object that represents it.
 Savepoint sample code for java.sql.Savepoint definition code for java.sql.Savepoint setSavepoint sample code for java.sql.Connection.setSavepoint(java.lang.String) definition code for java.sql.Connection.setSavepoint(java.lang.String) (String sample code for java.lang.String definition code for java.lang.String  name)
          Creates a savepoint with the given name in the current transaction and returns the new Savepoint object that represents it.
 void setTransactionIsolation sample code for java.sql.Connection.setTransactionIsolation(int) definition code for java.sql.Connection.setTransactionIsolation(int) (int level)
          Attempts to change the transaction isolation level for this Connection object to the one given.
 void setTypeMap sample code for java.sql.Connection.setTypeMap(java.util.Map) definition code for java.sql.Connection.setTypeMap(java.util.Map) (Map sample code for java.util.Map definition code for java.util.Map <String sample code for java.lang.String definition code for java.lang.String ,Class sample code for java.lang.Class definition code for java.lang.Class <?>> map)
          Installs the given TypeMap object as the type map for this Connection object.
 

Field Detail

TRANSACTION_NONE sample code for java.sql.Connection.TRANSACTION_NONE 

static final int TRANSACTION_NONE
A constant indicating that transactions are not supported.

See Also:
Constant Field Values

TRANSACTION_READ_UNCOMMITTED sample code for java.sql.Connection.TRANSACTION_READ_UNCOMMITTED 

static final int TRANSACTION_READ_UNCOMMITTED
A constant indicating that dirty reads, non-repeatable reads and phantom reads can occur. This level allows a row changed by one transaction to be read by another transaction before any changes in that row have been committed (a "dirty read"). If any of the changes are rolled back, the second transaction will have retrieved an invalid row.

See Also:
Constant Field Values

TRANSACTION_READ_COMMITTED sample code for java.sql.Connection.TRANSACTION_READ_COMMITTED 

static final int TRANSACTION_READ_COMMITTED
A constant indicating that dirty reads are prevented; non-repeatable reads and phantom reads can occur. This level only prohibits a transaction from reading a row with uncommitted changes in it.

See Also:
Constant Field Values

TRANSACTION_REPEATABLE_READ sample code for java.sql.Connection.TRANSACTION_REPEATABLE_READ 

static final int TRANSACTION_REPEATABLE_READ
A constant indicating that dirty reads and non-repeatable reads are prevented; phantom reads can occur. This level prohibits a transaction from reading a row with uncommitted changes in it, and it also prohibits the situation where one transaction reads a row, a second transaction alters the row, and the first transaction rereads the row, getting different values the second time (a "non-repeatable read").

See Also:
Constant Field Values

TRANSACTION_SERIALIZABLE sample code for java.sql.Connection.TRANSACTION_SERIALIZABLE 

static final int TRANSACTION_SERIALIZABLE
A constant indicating that dirty reads, non-repeatable reads and phantom reads are prevented. This level includes the prohibitions in TRANSACTION_REPEATABLE_READ and further prohibits the situation where one transaction reads all rows that satisfy a WHERE condition, a second transaction inserts a row that satisfies that WHERE condition, and the first transaction rereads for the same condition, retrieving the additional "phantom" row in the second read.

See Also:
Constant Field Values
Method Detail

createStatement sample code for java.sql.Connection.createStatement() definition code for java.sql.Connection.createStatement() 

Statement sample code for java.sql.Statement definition code for java.sql.Statement  createStatement()
                          throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Creates a Statement object for sending SQL statements to the database. SQL statements without parameters are normally executed using Statement objects. If the same SQL statement is executed many times, it may be more efficient to use a PreparedStatement object.

Result sets created using the returned Statement object will by default be type TYPE_FORWARD_ONLY and have a concurrency level of CONCUR_READ_ONLY.

Returns:
a new default Statement object
Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs

prepareStatement sample code for java.sql.Connection.prepareStatement(java.lang.String) definition code for java.sql.Connection.prepareStatement(java.lang.String) 

PreparedStatement sample code for java.sql.PreparedStatement definition code for java.sql.PreparedStatement  prepareStatement(String sample code for java.lang.String definition code for java.lang.String  sql)
                                   throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Creates a PreparedStatement object for sending parameterized SQL statements to the database.

A SQL statement with or without IN parameters can be pre-compiled and stored in a PreparedStatement object. This object can then be used to efficiently execute this statement multiple times.

Note: This method is optimized for handling parametric SQL statements that benefit from precompilation. If the driver supports precompilation, the method prepareStatement will send the statement to the database for precompilation. Some drivers may not support precompilation. In this case, the statement may not be sent to the database until the PreparedStatement object is executed. This has no direct effect on users; however, it does affect which methods throw certain SQLException objects.

Result sets created using the returned PreparedStatement object will by default be type TYPE_FORWARD_ONLY and have a concurrency level of CONCUR_READ_ONLY.

Parameters:
sql - an SQL statement that may contain one or more '?' IN parameter placeholders
Returns:
a new default PreparedStatement object containing the pre-compiled SQL statement
Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs

prepareCall sample code for java.sql.Connection.prepareCall(java.lang.String) definition code for java.sql.Connection.prepareCall(java.lang.String) 

CallableStatement sample code for java.sql.CallableStatement definition code for java.sql.CallableStatement  prepareCall(String sample code for java.lang.String definition code for java.lang.String  sql)
                              throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Creates a CallableStatement object for calling database stored procedures. The CallableStatement object provides methods for setting up its IN and OUT parameters, and methods for executing the call to a stored procedure.

Note: This method is optimized for handling stored procedure call statements. Some drivers may send the call statement to the database when the method prepareCall is done; others may wait until the CallableStatement object is executed. This has no direct effect on users; however, it does affect which method throws certain SQLExceptions.

Result sets created using the returned CallableStatement object will by default be type TYPE_FORWARD_ONLY and have a concurrency level of CONCUR_READ_ONLY.

Parameters:
sql - an SQL statement that may contain one or more '?' parameter placeholders. Typically this statement is a JDBC function call escape string.
Returns:
a new default CallableStatement object containing the pre-compiled SQL statement
Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs

nativeSQL sample code for java.sql.Connection.nativeSQL(java.lang.String) definition code for java.sql.Connection.nativeSQL(java.lang.String) 

String sample code for java.lang.String definition code for java.lang.String  nativeSQL(String sample code for java.lang.String definition code for java.lang.String  sql)
                 throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Converts the given SQL statement into the system's native SQL grammar. A driver may convert the JDBC SQL grammar into its system's native SQL grammar prior to sending it. This method returns the native form of the statement that the driver would have sent.

Parameters:
sql - an SQL statement that may contain one or more '?' parameter placeholders
Returns:
the native form of this statement
Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs

setAutoCommit sample code for java.sql.Connection.setAutoCommit(boolean) definition code for java.sql.Connection.setAutoCommit(boolean) 

void setAutoCommit(boolean autoCommit)
                   throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Sets this connection's auto-commit mode to the given state. If a connection is in auto-commit mode, then all its SQL statements will be executed and committed as individual transactions. Otherwise, its SQL statements are grouped into transactions that are terminated by a call to either the method commit or the method 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 object, the statement completes when the last row of the ResultSet object has been retrieved or the ResultSet object has been closed. In advanced cases, a single statement may return multiple results as well as output parameter values. In these cases, the commit occurs when all results and output parameter values have been retrieved.

NOTE: If this method is called during a transaction, the transaction is committed.

Parameters:
autoCommit - true to enable auto-commit mode; false to disable it
Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs
See Also:
getAutoCommit() sample code for java.sql.Connection.getAutoCommit() definition code for java.sql.Connection.getAutoCommit()

getAutoCommit sample code for java.sql.Connection.getAutoCommit() definition code for java.sql.Connection.getAutoCommit() 

boolean getAutoCommit()
                      throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Retrieves the current auto-commit mode for this Connection object.

Returns:
the current state of this Connection object's auto-commit mode
Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs
See Also:
setAutoCommit(boolean) sample code for java.sql.Connection.setAutoCommit(boolean) definition code for java.sql.Connection.setAutoCommit(boolean)

commit sample code for java.sql.Connection.commit() definition code for java.sql.Connection.commit() 

void commit()
            throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Makes all changes made since the previous commit/rollback permanent and releases any database locks currently held by this Connection object. This method should be used only when auto-commit mode has been disabled.

Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs or this Connection object is in auto-commit mode
See Also:
setAutoCommit(boolean) sample code for java.sql.Connection.setAutoCommit(boolean) definition code for java.sql.Connection.setAutoCommit(boolean)

rollback sample code for java.sql.Connection.rollback() definition code for java.sql.Connection.rollback() 

void rollback()
              throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Undoes all changes made in the current transaction and releases any database locks currently held by this Connection object. This method should be used only when auto-commit mode has been disabled.

Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs or this Connection object is in auto-commit mode
See Also:
setAutoCommit(boolean) sample code for java.sql.Connection.setAutoCommit(boolean) definition code for java.sql.Connection.setAutoCommit(boolean)

close sample code for java.sql.Connection.close() definition code for java.sql.Connection.close() 

void close()
           throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Releases this Connection object's database and JDBC resources immediately instead of waiting for them to be automatically released.

Calling the method close on a Connection object that is already closed is a no-op.

Note: A Connection object is automatically closed when it is garbage collected. Certain fatal errors also close a Connection object.

Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs

isClosed sample code for java.sql.Connection.isClosed() definition code for java.sql.Connection.isClosed() 

boolean isClosed()
                 throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Retrieves whether this Connection object has been closed. A connection is closed if the method close has been called on it or if certain fatal errors have occurred. This method is guaranteed to return true only when it is called after the method Connection.close has been called.

This method generally cannot be called to determine whether a connection to a database is valid or invalid. A typical client can determine that a connection is invalid by catching any exceptions that might be thrown when an operation is attempted.

Returns:
true if this Connection object is closed; false if it is still open
Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs

getMetaData sample code for java.sql.Connection.getMetaData() definition code for java.sql.Connection.getMetaData() 

DatabaseMetaData sample code for java.sql.DatabaseMetaData definition code for java.sql.DatabaseMetaData  getMetaData()
                             throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Retrieves a DatabaseMetaData object that contains metadata about the database to which this Connection object represents a connection. The metadata includes information about the database's tables, its supported SQL grammar, its stored procedures, the capabilities of this connection, and so on.

Returns:
a DatabaseMetaData object for this Connection object
Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs

setReadOnly sample code for java.sql.Connection.setReadOnly(boolean) definition code for java.sql.Connection.setReadOnly(boolean) 

void setReadOnly(boolean readOnly)
                 throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Puts this connection in read-only mode as a hint to the driver to enable database optimizations.

Note: This method cannot be called during a transaction.

Parameters:
readOnly - true enables read-only mode; false disables it
Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs or this method is called during a transaction

isReadOnly sample code for java.sql.Connection.isReadOnly() definition code for java.sql.Connection.isReadOnly() 

boolean isReadOnly()
                   throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Retrieves whether this Connection object is in read-only mode.

Returns:
true if this Connection object is read-only; false otherwise
Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs

setCatalog sample code for java.sql.Connection.setCatalog(java.lang.String) definition code for java.sql.Connection.setCatalog(java.lang.String) 

void setCatalog(String sample code for java.lang.String definition code for java.lang.String  catalog)
                throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Sets the given catalog name in order to select a subspace of this Connection object's database in which to work.

If the driver does not support catalogs, it will silently ignore this request.

Parameters:
catalog - the name of a catalog (subspace in this Connection object's database) in which to work
Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs
See Also:
getCatalog() sample code for java.sql.Connection.getCatalog() definition code for java.sql.Connection.getCatalog()

getCatalog sample code for java.sql.Connection.getCatalog() definition code for java.sql.Connection.getCatalog() 

String sample code for java.lang.String definition code for java.lang.String  getCatalog()
                  throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Retrieves this Connection object's current catalog name.

Returns:
the current catalog name or null if there is none
Throws:
SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException - if a database access error occurs
See Also:
setCatalog(java.lang.String) sample code for java.sql.Connection.setCatalog(java.lang.String) definition code for java.sql.Connection.setCatalog(java.lang.String)

setTransactionIsolation sample code for java.sql.Connection.setTransactionIsolation(int) definition code for java.sql.Connection.setTransactionIsolation(int) 

void setTransactionIsolation(int level)
                             throws SQLException sample code for java.sql.SQLException definition code for java.sql.SQLException
Attempts to change the transaction isolation level for this Connection object to the one given. The constants defined in the interface Connection are the possible transaction isolation levels.

Note: If this method is called during a transaction, the result is implementation-defined.

Parameters:
level - one of the following Connection constants: Connection.TRANSACTION_READ_UNCOMMITTED, Connection.TRANSACTION_READ_COMMITTED, Connection.TRANSACTION_REPEATABLE_READ, or Connection.TRANSACTION_SERIALIZABLE. (Note that Connection.TRANSACTION_NONE cannot be used because it specifies that transactions are not supported.)
Throws:
SQLException