- All Implemented Interfaces:
Driver
The driver automatically supports the correct JDBC specification version for the Java Virtual Machine's environment.
- JDBC 4.0 - Java SE 6
- JDBC 3.0 - Java 2 - JDK 1.4, J2SE 5.0
Loading this JDBC driver boots the database engine within the same Java virtual machine.
The correct code to load the Derby engine using this driver is (with approriate try/catch blocks):
Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance();
// or
new org.apache.derby.jdbc.EmbeddedDriver();
When loaded in this way, the class boots the actual JDBC driver indirectly.
The JDBC specification recommends the Class.ForName method without the .newInstance()
method call, but adding the newInstance() guarantees
that Derby will be booted on any Java Virtual Machine.
Note that you do not need to manually load the driver this way if you are running on Jave SE 6 or later. In that environment, the driver will be automatically loaded for you when your application requests a connection to a Derby database.
Any initial error messages are placed in the PrintStream supplied by the DriverManager. If the PrintStream is null error messages are sent to System.err. Once the Derby engine has set up an error logging facility (by default to derby.log) all subsequent messages are sent to it.
By convention, the class used in the Class.forName() method to boot a JDBC driver implements java.sql.Driver. This class is not the actual JDBC driver that gets registered with the Driver Manager. It proxies requests to the registered Derby JDBC driver.
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionbooleanacceptsURL(String url) Accept anything that starts withjdbc:derby:.connect(String url, Properties info) Connect to the URL if possibleintReturns the driver's major version number.intReturns the driver's minor version number.getPropertyInfo(String url, Properties info) Returns an array of DriverPropertyInfo objects describing possible properties.booleanReport whether the Driver is a genuine JDBC COMPLIANT (tm) driver.
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Constructor Details
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EmbeddedDriver
public EmbeddedDriver()
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Method Details
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acceptsURL
Accept anything that starts withjdbc:derby:.- Specified by:
acceptsURLin interfaceDriver- Throws:
SQLException- if a database-access error occurs.- See Also:
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connect
Connect to the URL if possible- Specified by:
connectin interfaceDriver- Throws:
SQLException- illegal url or problem with connectiong- See Also:
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getPropertyInfo
Returns an array of DriverPropertyInfo objects describing possible properties.- Specified by:
getPropertyInfoin interfaceDriver- Throws:
SQLException- if a database-access error occurs.- See Also:
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getMajorVersion
public int getMajorVersion()Returns the driver's major version number.- Specified by:
getMajorVersionin interfaceDriver- See Also:
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getMinorVersion
public int getMinorVersion()Returns the driver's minor version number.- Specified by:
getMinorVersionin interfaceDriver- See Also:
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jdbcCompliant
public boolean jdbcCompliant()Report whether the Driver is a genuine JDBC COMPLIANT (tm) driver.- Specified by:
jdbcCompliantin interfaceDriver- See Also:
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getParentLogger
- Specified by:
getParentLoggerin interfaceDriver- Throws:
SQLFeatureNotSupportedException
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