Clears all warnings reported for this Connection object. After a call to this method, the method getWarnings returns null until a new warning is reported for this Connection object.

Throws

SQLException: SQLException if a database access error occurs or this method is called on a closed connection

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.

It is strongly recommended that an application explicitly commits or rolls back an active transaction prior to calling the close method. If the close method is called and there is an active transaction, the results are implementation-defined.

Throws

SQLException: SQLException if a database access error occurs

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: if a database access error occurs, this method is called while participating in a distributed transaction, if this method is called on a closed conection or this Connection object is in auto-commit mode
See also	setAutoCommit

Factory method for creating Array objects.

Note: When createArrayOf is used to create an array object that maps to a primitive data type, then it is implementation-defined whether the Array object is an array of that primitive data type or an array of Object.

Note: The JDBC driver is responsible for mapping the elements Object array to the default JDBC SQL type defined in java.sql.Types for the given class of Object. The default mapping is specified in Appendix B of the JDBC specification. If the resulting JDBC type is not the appropriate type for the given typeName then it is implementation defined whether an SQLException is thrown or the driver supports the resulting conversion.

typeName	the SQL name of the type the elements of the array map to. The typeName is a database-specific name which may be the name of a built-in type, a user-defined type or a standard SQL type supported by this database. This is the value returned by Array.getBaseTypeName
elements	the elements that populate the returned object
return	an Array object whose elements map to the specified SQL type
Throws	SQLException: if a database error occurs, the JDBC type is not appropriate for the typeName and the conversion is not supported, the typeName is null or this method is called on a closed connection
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this data type
since	1.6

Constructs an object that implements the Blob interface. The object returned initially contains no data. The setBinaryStream and setBytes methods of the Blob interface may be used to add data to the Blob.

return	An object that implements the Blob interface
Throws	SQLException: if an object that implements the Blob interface can not be constructed, this method is called on a closed connection or a database access error occurs.
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this data type
since	1.6

Constructs an object that implements the Clob interface. The object returned initially contains no data. The setAsciiStream, setCharacterStream and setString methods of the Clob interface may be used to add data to the Clob.

return	An object that implements the Clob interface
Throws	SQLException: if an object that implements the Clob interface can not be constructed, this method is called on a closed connection or a database access error occurs.
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this data type
since	1.6

Constructs an object that implements the NClob interface. The object returned initially contains no data. The setAsciiStream, setCharacterStream and setString methods of the NClob interface may be used to add data to the NClob.

return	An object that implements the NClob interface
Throws	SQLException: if an object that implements the NClob interface can not be constructed, this method is called on a closed connection or a database access error occurs.
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this data type
since	1.6

Creates a concrete implementation of a Query interface using the JDBC drivers QueryObjectGenerator implementation. If the JDBC driver does not provide its own QueryObjectGenerator, the QueryObjectGenerator provided with Java SE will be used.

ifc	The Query interface that will be created
return	A concrete implementation of a Query interface
Throws	SQLException: if a database access error occurs or this method is called on a closed connection
since	1.6

Creates a concrete implementation of a Query interface using the JDBC drivers QueryObjectGenerator implementation.

If the JDBC driver does not provide its own QueryObjectGenerator, the QueryObjectGenerator provided with Java SE will be used.

This method is primarly for developers of Wrappers to JDBC implementations. Application developers should use createQueryObject(Class<T> ifc).

ifc	The Query interface that will be created
con	The Connection that will be used when invoking methods that access the data source. The QueryObjectGenerator implementation will use this Connection without any unwrapping or modications to create statements from the data source.
return	An concrete implementation of a Query interface
Throws	SQLException: if a database access error occurs.
since	1.6

Constructs an object that implements the SQLXML interface. The object returned initially contains no data. The createXmlStreamWriter object and setString method of the SQLXML interface may be used to add data to the SQLXML object.

return	An object that implements the SQLXML interface
Throws	SQLException: if an object that implements the SQLXML interface can not be constructed, this method is called on a closed connection or a database access error occurs.
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this data type
since	1.6

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. The holdability of the created result sets can be determined by calling #getHoldability.

return	a new default Statement object
Throws	SQLException: if a database access error occurs or this method is called on a closed connection

Creates a Statement object that will generate ResultSet objects with the given type and concurrency. This method is the same as the createStatement method above, but it allows the default result set type and concurrency to be overridden. The holdability of the created result sets can be determined by calling #getHoldability.

resultSetType	a result set type; one of ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE
resultSetConcurrency	a concurrency type; one of ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE
return	a new Statement object that will generate ResultSet objects with the given type and concurrency
Throws	SQLException: if a database access error occurs, this method is called on a closed connection or the given parameters are not ResultSet constants indicating type and concurrency
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method or this method is not supported for the specified result set type and result set concurrency.
since	1.2

Creates a Statement object that will generate ResultSet objects with the given type, concurrency, and holdability. This method is the same as the createStatement method above, but it allows the default result set type, concurrency, and holdability to be overridden.

resultSetType	one of the following ResultSet constants: ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE
resultSetConcurrency	one of the following ResultSet constants: ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE
resultSetHoldability	one of the following ResultSet constants: ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT
return	a new Statement object that will generate ResultSet objects with the given type, concurrency, and holdability
Throws	SQLException: if a database access error occurs, this method is called on a closed connection or the given parameters are not ResultSet constants indicating type, concurrency, and holdability
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method or this method is not supported for the specified result set type, result set holdability and result set concurrency.
since	1.4
See also	java.sql.ResultSet

Factory method for creating Struct objects.

typeName	the SQL type name of the SQL structured type that this Struct object maps to. The typeName is the name of a user-defined type that has been defined for this database. It is the value returned by Struct.getSQLTypeName.
attributes	the attributes that populate the returned object
return	a Struct object that maps to the given SQL type and is populated with the given attributes
Throws	SQLException: if a database error occurs, the typeName is null or this method is called on a closed connection
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this data type
since	1.6

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.

sql	an SQL statement that may contain one or more '?' parameter placeholders
return	the native form of this statement
Throws	SQLException: if a database access error occurs or this method is called on a closed connection

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. The holdability of the created result sets can be determined by calling #getHoldability.

sql	an SQL statement that may contain one or more '?' parameter placeholders. Typically this statement is specified using JDBC call escape syntax.
return	a new default CallableStatement object containing the pre-compiled SQL statement
Throws	SQLException: if a database access error occurs or this method is called on a closed connection

Creates a CallableStatement object that will generate ResultSet objects with the given type and concurrency. This method is the same as the prepareCall method above, but it allows the default result set type and concurrency to be overridden. The holdability of the created result sets can be determined by calling #getHoldability.

sql	a String object that is the SQL statement to be sent to the database; may contain on or more '?' parameters
resultSetType	a result set type; one of ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE
resultSetConcurrency	a concurrency type; one of ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE
return	a new CallableStatement object containing the pre-compiled SQL statement that will produce ResultSet objects with the given type and concurrency
Throws	SQLException: if a database access error occurs, this method is called on a closed connection or the given parameters are not ResultSet constants indicating type and concurrency
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method or this method is not supported for the specified result set type and result set concurrency.
since	1.2

Creates a CallableStatement object that will generate ResultSet objects with the given type and concurrency. This method is the same as the prepareCall method above, but it allows the default result set type, result set concurrency type and holdability to be overridden.

sql	a String object that is the SQL statement to be sent to the database; may contain on or more '?' parameters
resultSetType	one of the following ResultSet constants: ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE
resultSetConcurrency	one of the following ResultSet constants: ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE
resultSetHoldability	one of the following ResultSet constants: ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT
return	a new CallableStatement object, containing the pre-compiled SQL statement, that will generate ResultSet objects with the given type, concurrency, and holdability
Throws	SQLException: if a database access error occurs, this method is called on a closed connection or the given parameters are not ResultSet constants indicating type, concurrency, and holdability
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method or this method is not supported for the specified result set type, result set holdability and result set concurrency.
since	1.4
See also	java.sql.ResultSet

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. The holdability of the created result sets can be determined by calling #getHoldability.

sql	an SQL statement that may contain one or more '?' IN parameter placeholders
return	a new default PreparedStatement object containing the pre-compiled SQL statement
Throws	SQLException: if a database access error occurs or this method is called on a closed connection

Creates a PreparedStatement object that will generate ResultSet objects with the given type and concurrency. This method is the same as the prepareStatement method above, but it allows the default result set type and concurrency to be overridden. The holdability of the created result sets can be determined by calling #getHoldability.

sql	a String object that is the SQL statement to be sent to the database; may contain one or more '?' IN parameters
resultSetType	a result set type; one of ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE
resultSetConcurrency	a concurrency type; one of ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE
return	a new PreparedStatement object containing the pre-compiled SQL statement that will produce ResultSet objects with the given type and concurrency
Throws	SQLException: if a database access error occurs, this method is called on a closed connection or the given parameters are not ResultSet constants indicating type and concurrency
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method or this method is not supported for the specified result set type and result set concurrency.
since	1.2

Creates a PreparedStatement object that will generate ResultSet objects with the given type, concurrency, and holdability.

This method is the same as the prepareStatement method above, but it allows the default result set type, concurrency, and holdability to be overridden.

sql	a String object that is the SQL statement to be sent to the database; may contain one or more '?' IN parameters
resultSetType	one of the following ResultSet constants: ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE
resultSetConcurrency	one of the following ResultSet constants: ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE
resultSetHoldability	one of the following ResultSet constants: ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT
return	a new PreparedStatement object, containing the pre-compiled SQL statement, that will generate ResultSet objects with the given type, concurrency, and holdability
Throws	SQLException: if a database access error occurs, this method is called on a closed connection or the given parameters are not ResultSet constants indicating type, concurrency, and holdability
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method or this method is not supported for the specified result set type, result set holdability and result set concurrency.
since	1.4
See also	java.sql.ResultSet

Creates a default PreparedStatement object that has the capability to retrieve auto-generated keys. The given constant tells the driver whether it should make auto-generated keys available for retrieval. This parameter is ignored if the SQL statement is not an INSERT statement, or an SQL statement able to return auto-generated keys (the list of such statements is vendor-specific).

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 SQLExceptions.

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. The holdability of the created result sets can be determined by calling #getHoldability.

sql	an SQL statement that may contain one or more '?' IN parameter placeholders
autoGeneratedKeys	a flag indicating whether auto-generated keys should be returned; one of Statement.RETURN_GENERATED_KEYS or Statement.NO_GENERATED_KEYS
return	a new PreparedStatement object, containing the pre-compiled SQL statement, that will have the capability of returning auto-generated keys
Throws	SQLException: if a database access error occurs, this method is called on a closed connection or the given parameter is not a Statement constant indicating whether auto-generated keys should be returned
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method with a constant of Statement.RETURN_GENERATED_KEYS
since	1.4

Creates a default PreparedStatement object capable of returning the auto-generated keys designated by the given array. 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 SQL statement is not an INSERT statement, or an SQL statement able to return auto-generated keys (the list of such statements is vendor-specific).

An 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 SQLExceptions.

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. The holdability of the created result sets can be determined by calling #getHoldability.

sql	an SQL statement that may contain one or more '?' IN parameter placeholders
columnIndexes	an array of column indexes indicating the columns that should be returned from the inserted row or rows
return	a new PreparedStatement object, containing the pre-compiled statement, that is capable of returning the auto-generated keys designated by the given array of column indexes
Throws	SQLException: if a database access error occurs or this method is called on a closed connection
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method
since	1.4

Creates a default PreparedStatement object capable of returning the auto-generated keys designated by the given array. This array contains the names of the columns in the target table that contain the auto-generated keys that should be returned. The driver will ignore the array if the SQL statement is not an INSERT statement, or an SQL statement able to return auto-generated keys (the list of such statements is vendor-specific).

An 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 SQLExceptions.

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. The holdability of the created result sets can be determined by calling #getHoldability.

sql	an SQL statement that may contain one or more '?' IN parameter placeholders
columnNames	an array of column names indicating the columns that should be returned from the inserted row or rows
return	a new PreparedStatement object, containing the pre-compiled statement, that is capable of returning the auto-generated keys designated by the given array of column names
Throws	SQLException: if a database access error occurs or this method is called on a closed connection
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method
since	1.4

Removes the specified Savepoint and subsequent Savepoint objects from the current transaction. Any reference to the savepoint after it have been removed will cause an SQLException to be thrown.

savepoint	the Savepoint object to be removed
Throws	SQLException: if a database access error occurs, this method is called on a closed connection or the given Savepoint object is not a valid savepoint in the current transaction
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method
since	1.4

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: if a database access error occurs, this method is called while participating in a distributed transaction, this method is called on a closed connection or this Connection object is in auto-commit mode
See also	setAutoCommit

Undoes all changes made after the given Savepoint object was set.

This method should be used only when auto-commit has been disabled.

savepoint	the Savepoint object to roll back to
Throws	SQLException: if a database access error occurs, this method is called while participating in a distributed transaction, this method is called on a closed connection, the Savepoint object is no longer valid, or this Connection object is currently in auto-commit mode
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method
since	1.4
See also	java.sql.Savepoint, rollback

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. The time when the statement completes depends on the type of SQL Statement:

• For DML statements, such as Insert, Update or Delete, and DDL statements, the statement is complete as soon as it has finished executing.
• For Select statements, the statement is complete when the associated result set is closed.
• For CallableStatement objects or for statements that return multiple results, the statement is complete when all of the associated result sets have been closed, and all update counts and output parameters have been retrieved.

NOTE: If this method is called during a transaction and the auto-commit mode is changed, the transaction is committed. If setAutoCommit is called and the auto-commit mode is not changed, the call is a no-op.

autoCommit	true to enable auto-commit mode; false to disable it
Throws	SQLException: if a database access error occurs, setAutoCommit(true) is called while participating in a distributed transaction, or this method is called on a closed connection
See also	getAutoCommit

Retrieves the current auto-commit mode for this Connection object.

return	the current state of this Connection object's auto-commit mode
Throws	SQLException: if a database access error occurs or this method is called on a closed connection
See also	setAutoCommit

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.

catalog	the name of a catalog (subspace in this Connection object's database) in which to work
Throws	SQLException: if a database access error occurs or this method is called on a closed connection
See also	getCatalog

Retrieves this Connection object's current catalog name.

return	the current catalog name or null if there is none
Throws	SQLException: if a database access error occurs or this method is called on a closed connection
See also	setCatalog

Sets the value of the client info property specified by name to the value specified by value.

Applications may use the DatabaseMetaData.getClientInfoProperties method to determine the client info properties supported by the driver and the maximum length that may be specified for each property.

The driver stores the value specified in a suitable location in the database. For example in a special register, session parameter, or system table column. For efficiency the driver may defer setting the value in the database until the next time a statement is executed or prepared. Other than storing the client information in the appropriate place in the database, these methods shall not alter the behavior of the connection in anyway. The values supplied to these methods are used for accounting, diagnostics and debugging purposes only.

The driver shall generate a warning if the client info name specified is not recognized by the driver.

If the value specified to this method is greater than the maximum length for the property the driver may either truncate the value and generate a warning or generate a SQLClientInfoException. If the driver generates a SQLClientInfoException, the value specified was not set on the connection.

The following are standard client info properties. Drivers are not required to support these properties however if the driver supports a client info property that can be described by one of the standard properties, the standard property name should be used.

• ApplicationName - The name of the application currently utilizing the connection
• ClientUser - The name of the user that the application using the connection is performing work for. This may not be the same as the user name that was used in establishing the connection.
• ClientHostname - The hostname of the computer the application using the connection is running on.

name	The name of the client info property to set
value	The value to set the client info property to. If the value is null, the current value of the specified property is cleared.
Throws	SQLClientInfoException: if the database server returns an error while setting the client info value on the database server or this method is called on a closed connection
since	1.6

Sets the value of the connection's client info properties. The Properties object contains the names and values of the client info properties to be set. The set of client info properties contained in the properties list replaces the current set of client info properties on the connection. If a property that is currently set on the connection is not present in the properties list, that property is cleared. Specifying an empty properties list will clear all of the properties on the connection. See setClientInfo (String, String) for more information.

If an error occurs in setting any of the client info properties, a SQLClientInfoException is thrown. The SQLClientInfoException contains information indicating which client info properties were not set. The state of the client information is unknown because some databases do not allow multiple client info properties to be set atomically. For those databases, one or more properties may have been set before the error occurred.

properties	the list of client info properties to set
since	1.6
Throws	SQLClientInfoException: if the database server returns an error while setting the clientInfo values on the database server or this method is called on a closed connection
See also	setClientInfo(String, String)

Returns the value of the client info property specified by name. This method may return null if the specified client info property has not been set and does not have a default value. This method will also return null if the specified client info property name is not supported by the driver.

Applications may use the DatabaseMetaData.getClientInfoProperties method to determine the client info properties supported by the driver.

name	The name of the client info property to retrieve
return	The value of the client info property specified
Throws	SQLException: if the database server returns an error when fetching the client info value from the database or this method is called on a closed connection
since	1.6
See also	getClientInfoProperties

Returns a list containing the name and current value of each client info property supported by the driver. The value of a client info property may be null if the property has not been set and does not have a default value.

return	A Properties object that contains the name and current value of each of the client info properties supported by the driver.
Throws	SQLException: if the database server returns an error when fetching the client info values from the database or this method is called on a closed connection
since	1.6

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.

return	true if this Connection object is closed; false if it is still open
Throws	SQLException: if a database access error occurs

Changes the default holdability of ResultSet objects created using this Connection object to the given holdability. The default holdability of ResultSet objects can be be determined by invoking DatabaseMetaData#getResultSetHoldability.

holdability	a ResultSet holdability constant; one of ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT
Throws	SQLException: if a database access occurs, this method is called on a closed connection, or the given parameter is not a ResultSet constant indicating holdability
Throws	SQLFeatureNotSupportedException: if the given holdability is not supported
since	1.4
See also	getHoldability, getResultSetHoldability, java.sql.ResultSet

Retrieves the current holdability of ResultSet objects created using this Connection object.

return	the holdability, one of ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT
Throws	SQLException: if a database access error occurs or this method is called on a closed connection
since	1.4
See also	setHoldability, getResultSetHoldability, java.sql.ResultSet

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.

return	a DatabaseMetaData object for this Connection object
Throws	SQLException: if a database access error occurs or this method is called on a closed connection

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.

readOnly	true enables read-only mode; false disables it
Throws	SQLException: if a database access error occurs, this method is called on a closed connection or this method is called during a transaction

Retrieves whether this Connection object is in read-only mode.

return	true if this Connection object is read-only; false otherwise
Throws	SQLException: SQLException if a database access error occurs or this method is called on a closed connection

Creates an unnamed savepoint in the current transaction and returns the new Savepoint object that represents it.

if setSavepoint is invoked outside of an active transaction, a transaction will be started at this newly created savepoint.

return	the new Savepoint object
Throws	SQLException: if a database access error occurs, this method is called while participating in a distributed transaction, this method is called on a closed connection or this Connection object is currently in auto-commit mode
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method
since	1.4
See also	java.sql.Savepoint

Creates a savepoint with the given name in the current transaction and returns the new Savepoint object that represents it.

if setSavepoint is invoked outside of an active transaction, a transaction will be started at this newly created savepoint.

name	a String containing the name of the savepoint
return	the new Savepoint object
Throws	SQLException: if a database access error occurs, this method is called while participating in a distributed transaction, this method is called on a closed connection or this Connection object is currently in auto-commit mode
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method
since	1.4
See also	java.sql.Savepoint

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.

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: if a database access error occurs, this method is called on a closed connection or the given parameter is not one of the Connection constants
See also	supportsTransactionIsolationLevel, getTransactionIsolation

Retrieves this Connection object's current transaction isolation level.

return	the current transaction isolation level, which will be one of the following constants: Connection.TRANSACTION_READ_UNCOMMITTED, Connection.TRANSACTION_READ_COMMITTED, Connection.TRANSACTION_REPEATABLE_READ, Connection.TRANSACTION_SERIALIZABLE, or Connection.TRANSACTION_NONE.
Throws	SQLException: if a database access error occurs or this method is called on a closed connection
See also	setTransactionIsolation

Installs the given TypeMap object as the type map for this Connection object. The type map will be used for the custom mapping of SQL structured types and distinct types.

map	the java.util.Map object to install as the replacement for this Connection object's default type map
Throws	SQLException: if a database access error occurs, this method is called on a closed connection or the given parameter is not a java.util.Map object
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method
since	1.2
See also	getTypeMap

Retrieves the Map object associated with this Connection object. Unless the application has added an entry, the type map returned will be empty.

return	the java.util.Map object associated with this Connection object
Throws	SQLException: if a database access error occurs or this method is called on a closed connection
Throws	SQLFeatureNotSupportedException: if the JDBC driver does not support this method
since	1.2
See also	setTypeMap

Returns true if the connection has not been closed and is still valid. The driver shall submit a query on the connection or use some other mechanism that positively verifies the connection is still valid when this method is called.

The query submitted by the driver to validate the connection shall be executed in the context of the current transaction.

timeout	- The time in seconds to wait for the database operation used to validate the connection to complete. If the timeout period expires before the operation completes, this method returns false. A value of 0 indicates a timeout is not applied to the database operation.
return	true if the connection is valid, false otherwise
Throws	SQLException: if the value supplied for timeout is less then 0
since	1.6
See also	getClientInfoProperties

Retrieves the first warning reported by calls on this Connection object. If there is more than one warning, subsequent warnings will be chained to the first one and can be retrieved by calling the method SQLWarning.getNextWarning on the warning that was retrieved previously.

This method may not be called on a closed connection; doing so will cause an SQLException to be thrown.

Note: Subsequent warnings will be chained to this SQLWarning.

return	the first SQLWarning object or null if there are none
Throws	SQLException: if a database access error occurs or this method is called on a closed connection
See also	java.sql.SQLWarning