connecting to databases with jdbc

... you to map almost any Java type to a JDBC data type You cannot coerce data types into types that not make sense, however For example, it makes little sense to try to convert an Integer to a JDBC ... recommendations with regard to JDBC to Java data type conversions Tables 7−3, 7−4, 7−5, and 7−6 list the JDBC types and shows the ResultSet.getXXX() method to use for converting each to the corresponding ... when working with unknown database systems However, if you understand your target database and the data stored within it, feel free to cast the data to another type Table 7−3: JDBC to Java Mappings...

Ngày tải lên: 14/08/2014, 06:21

... LENGTHB, NLSSORT, CHARTOROWID, CONVERT, HEXTORAW, 148 Chapter 8: Mining Database Metadata with JDBC RAWTOHEX, ROWIDTOCHAR, TO_ CHAR, TO_ DATE, TO_ LABEL, TO_ MULTI_BYTE, TO_ NUMBER, TO_ SINGLE_BYTE Time ... the term Factory Method to refer to the pattern definition I use the term factory method to refer to the method within a factory that creates a product object The term factory refers to an object ... of a Singleton Singleton object not instantiated yet Singleton object instantiated Object id:Chapter10.Singleton@2a340e Assign a reference to the Singleton object to another Singleton variable...

Ngày tải lên: 14/08/2014, 06:21

... changes are automatically committed to the database – Turn auto-commit off to group two or more statements together into a transaction connection.setAutoCommit(false); – Call commit to permanently ... Transactions) • getAutoCommit/setAutoCommit – By default, a connection is set to auto-commit – Retrieves or sets the auto-commit mode • commit – Force all changes since the last call to commit to become ... http://java.sun.com/javase/6/docs/technotes/guides /jdbc/ • JDBC Tutorial – http://java.sun.com/docs/books/tutorial /jdbc/ • API for java.sql – http://java.sun.com/javase/6/docs/api/java/sql/ package-summary.html • List of Available JDBC Drivers...

Ngày tải lên: 23/03/2014, 16:20

... http://splash.javasoft.com /jdbc Uncompress the package Move the jdbc directory (located in the jdbc- odbc/classes directory) into a directory listed in your CLASSPATH, or move it to your regular Java API tree Move JdbcOdbc.dll ... the temp directory where you untarred the downloaded file) to the C:\JAVA\SRC directory • Copy the java folder from the JDBC\ SRC directory to C:\JAVA\SRC Set the CLASSPATH to point to c:/usr/local/java/src ... the subprotocol The subprotocol (which can be “odbc,” “oracle,” etc.) is used by the JDBC drivers to identify themselves and then to connect to that specific subprotocol The subprotocol is also...

Ngày tải lên: 23/03/2014, 16:21

... performance 1.3.1.2 JDBC JDBC is in a SQL-level API that allows you to embed SQL statements as arguments to methods in JDBC interfaces To enable you to this in a database-independent fashion, JDBC requires ... need to get from what you are modeling, to how you are going to model it to the physical data model To implement this system, you need to take a few more steps The first step is to add a column to ... step of connecting, because you have to specify a driver I'll discuss that first to get it out of the way Figure 3.4 shows how an application uses JDBC to talk to one or more databases without...

Ngày tải lên: 25/03/2014, 10:41

... performance 1.3.1.2 JDBC JDBC is in a SQL-level API that allows you to embed SQL statements as arguments to methods in JDBC interfaces To enable you to this in a database-independent fashion, JDBC requires ... need to get from what you are modeling, to how you are going to model it to the physical data model To implement this system, you need to take a few more steps The first step is to add a column to ... step of connecting, because you have to specify a driver I'll discuss that first to get it out of the way Figure 3.4 shows how an application uses JDBC to talk to one or more databases without...

Ngày tải lên: 27/06/2014, 11:20

... step of connecting, because you have to specify a driver I'll discuss that first to get it out of the way Figure 3.4 shows how an application uses JDBC to talk to one or more databases without ... java.sql.Connection) for connecting to a database: java.sql.Driver page 31 JDBC and Java 2nd edition Unless you are writing your own custom JDBC implementation, you should never have to deal with this class ... Sybase, and legacy systems via GENESIS ODBC-supported databases ODBC-supported databases YARD-SQL Database 3.1.3 Alternatives to JDBC Without JDBC, only disparate, proprietary database access solutions...

Ngày tải lên: 12/08/2014, 16:21

... JDBC and Java 2nd edition The JDBC 2.0 Optional Package enables you to store a kind of connection factory in a directory service via JNDI This connection factory, or, in JDBC terms, ... directory service A JNDI service provider is to JNDI as a JDBC driver is to JDBC Specifically, JNDI provides a naming- and directory-service independent API to support potential naming and directory ... custom approach to handling searches won't work with someone else's custom approach to searching without forcing clients to deal with both search models Transactions page 90 JDBC and Java 2nd...

Ngày tải lên: 12/08/2014, 16:21

... supported by JDBC, you would leave out the ability to support such nonJDBC data stores as object databases and digital media repositories You are therefore going to develop a custom, data-store-independent ... it into the data store load( ) Tells the object to load its data from the data store remove( ) Removes the object from the database store( ) Attempts to save any changes made to the object to the ... null ) { // use the JDBC generator if none specified generator = new JDBCGenerator( ); } else { try { // instantiates a concrete sequence generator generator = (SequenceGenerator)Class.forName(cname).newInstance(...

Ngày tải lên: 12/08/2014, 16:21

... leave it be if( toStore.contains(ob) || toCreate.contains(ob) ) { return; } if( toRemove.contains(ob) ) { return; } toStore.add(ob); } /** * Each data store implements this method to * perform the ... // so remove it from the list of things to save if( toStore.contains(ob) ) { toStore.remove(ob); } toRemove.add(ob); } /** * Adds the specified entity to the list of entities * modified in this ... } toCreate.clear( ); // invalidate all removed objects obs = toRemove.iterator( ); while( obs.hasNext( ) ) { BaseEntity p = (BaseEntity)obs.next( ); p.invalidate( ); } toRemove.clear( ); toStore.clear(...

Ngày tải lên: 12/08/2014, 16:21

... consider when a teller reads customer information to change the customer address, and the bank manager reads information about the same customer to add a comment to the customer file If they both read ... implementations to provide the data To support the tree in this environment, you need to build three TreeNode implementations: one to represent the root node of the tree,[2] one to represent customer objects, ... implements Enumeration { private Iterator iterator; public IteratorEnumeration(Iterator it) { super( ); iterator = it; } public boolean hasMoreElements( ) { return iterator.hasNext( ); } } public Object...

Ngày tải lên: 12/08/2014, 16:21

... distinctive approach to technical topics, breathing personality and life into potentially dry subjects Ann Schirmer was the copyeditor and interior compositor for Database Programming with JDBC and Java, ... Description Implementors of this interface act as factories for providing PooledConnection instances As with the DataSource interface, this class is designed to be registered with a JNDI directory service ... Chapter 12 The JDBC Optional Package Reference The JDBC Optional Package is a new extension to the JDBC API Its purpose is to provide nonessential, but useful database access features without bogging...

Ngày tải lên: 12/08/2014, 16:21

... performance 1.3.1.2 JDBC JDBC is in a SQL-level API that allows you to embed SQL statements as arguments to methods in JDBC interfaces To enable you to this in a database-independent fashion, JDBC requires ... need to get from what you are modeling, to how you are going to model it to the physical data model To implement this system, you need to take a few more steps The first step is to add a column to ... Java, you need to create a page 13 JDBC and Java 2nd edition translation layer that maps the relational world into your object world While JDBC provides you with access to relational databases, it...

Ngày tải lên: 12/08/2014, 21:20

... step of connecting, because you have to specify a driver I'll discuss that first to get it out of the way Figure 3.4 shows how an application uses JDBC to talk to one or more databases without ... java.sql.Connection) for connecting to a database: java.sql.Driver page 31 JDBC and Java 2nd edition Unless you are writing your own custom JDBC implementation, you should never have to deal with this class ... Sybase, and legacy systems via GENESIS ODBC-supported databases ODBC-supported databases YARD-SQL Database 3.1.3 Alternatives to JDBC Without JDBC, only disparate, proprietary database access solutions...

Ngày tải lên: 12/08/2014, 21:20

... unlikely to be faster than its stored procedure counterpart and that the stored procedure counterpart is likely to be moderately faster than the prepared statement Stored procedures are truer to the ... than a tool for assigning a bunch of SQL statements to a JDBC Statement object for execution together Because it makes no sense to manage results in batch processing, the statements you pass to addBatch() ... through getObject() and setObject() even though JDBC provides a special interface—java.sql.Struct to support them The JDBC driver fetches the underlying data in the Struct before returning it to you...

Ngày tải lên: 12/08/2014, 21:20

... JDBC and Java 2nd edition The JDBC 2.0 Optional Package enables you to store a kind of connection factory in a directory service via JNDI This connection factory, or, in JDBC terms, ... directory service A JNDI service provider is to JNDI as a JDBC driver is to JDBC Specifically, JNDI provides a naming- and directory-service independent API to support potential naming and directory ... custom approach to handling searches won't work with someone else's custom approach to searching without forcing clients to deal with both search models Transactions page 90 JDBC and Java 2nd...

Ngày tải lên: 12/08/2014, 21:20

... supported by JDBC, you would leave out the ability to support such nonJDBC data stores as object databases and digital media repositories You are therefore going to develop a custom, data-store-independent ... it into the data store load( ) Tells the object to load its data from the data store remove( ) Removes the object from the database store( ) Attempts to save any changes made to the object to the ... null ) { // use the JDBC generator if none specified generator = new JDBCGenerator( ); } else { try { // instantiates a concrete sequence generator generator = (SequenceGenerator)Class.forName(cname).newInstance(...

Ngày tải lên: 12/08/2014, 21:20

... leave it be if( toStore.contains(ob) || toCreate.contains(ob) ) { return; } if( toRemove.contains(ob) ) { return; } toStore.add(ob); } /** * Each data store implements this method to * perform the ... // so remove it from the list of things to save if( toStore.contains(ob) ) { toStore.remove(ob); } toRemove.add(ob); } /** * Adds the specified entity to the list of entities * modified in this ... } toCreate.clear( ); // invalidate all removed objects obs = toRemove.iterator( ); while( obs.hasNext( ) ) { BaseEntity p = (BaseEntity)obs.next( ); p.invalidate( ); } toRemove.clear( ); toStore.clear(...

Ngày tải lên: 12/08/2014, 21:20

... consider when a teller reads customer information to change the customer address, and the bank manager reads information about the same customer to add a comment to the customer file If they both read ... implementations to provide the data To support the tree in this environment, you need to build three TreeNode implementations: one to represent the root node of the tree,[2] one to represent customer objects, ... implements Enumeration { private Iterator iterator; public IteratorEnumeration(Iterator it) { super( ); iterator = it; } public boolean hasMoreElements( ) { return iterator.hasNext( ); } } public Object...

Ngày tải lên: 12/08/2014, 21:20

... choose to manually commit a series of statements together as a single transaction In this case, you use the setAutoCommit( ) method to turn auto-commit off You then follow your statements with ... boolean getAutoCommit( ) throws SQLException public void setAutoCommit(boolean ac) throws SQLException Description By default, all Connection objects are in auto-commit mode With auto-commit mode ... locks) associated with a given JDBC Connection This method is automatically called when garbage collection occurs; however, it is best to manually close a Connection once you are done with it, as it...

Ngày tải lên: 12/08/2014, 21:20