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JSP: The Complete Reference
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The JDBC Database URL
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The key argument to DriverManagergetConnection() is a JDBC URL, which is a string with three components separated by semicolons: <protocol>:<subprotocol>:<subname> where I protocol is always jdbc I subprotocol is a vendor-specific string that identifies the driver to be used The driver indicates whether it can handle that subprotocol when asked by the driver manager For example, the JDBC-ODBC bridge uses the reserved value odbc as its subprotocol This value is intended to be unique across all driver vendors Sun Microsystems acts as an informal registrar of JDBC subprotocols I subname identifies the specific database to connect to This string contains whatever the driver needs to identify the database It may also contain connection parameters the database needs Examples of JDBC URLs are
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jdbc:odbc:usda
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This would indicate an ODBC data source named usda that is accessed by the JDBC-ODBC bridge driver
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jdbc:idb:c:/path/databaseprp
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InstantDB interprets the subname to be a properties file that describes the database location and characteristics
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"jdbc:oracle:thin:@" + "(DESCRIPTION=" + "(ADDRESS=(HOST=u25nv)" + "(PROTOCOL=tcp)" + "(PORT=4311))" + "(CONNECT_DATA=(SID=music)))"
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This is a lengthy connection string that might be used with the Oracle thin client driver As was the case with driver registration, JDBC 20 makes possible using a DataSource from a naming service to hide the details of the JDBC URL
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Database Access
The Statement Interfaces
The SQL language consists of statements that create, manipulate, and extract data from a relational database JDBC provides an object-oriented representation of these SQL statements that encapsulates their text, execution status, and results Not surprisingly, this representation is called the javasqlStatement interface Statement objects send SQL commands to a database, which can be any of the following types: I A data definition command such as CREATE TABLE or CREATE INDEX I A data manipulation command such as INSERT or UPDATE I A SELECT statement for performing a query Data manipulation commands return a count of the number of rows modified, whereas a SELECT statement returns a set of rows known as a result set The Statement interface has two specialized subinterfaces that extend its capabilities: PreparedStatement, which uses precompiles SQL, and CallableStatement, which invokes stored procedures The following section discusses all three types of statements and how they are used
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Statement
The base interface is javasqlStatement Because this is an interface, it doesn t have a constructor; instead, it s obtained from the connection object with ConnectioncreateStatement() A typical example follows
Connection con = null; try { con = DriverManagergetConnection(URL); Statement stmt = concreateStatement(); stmtclose(); } finally { if (con != null) conclose(); }
JDBC 20 introduces an additional form of createStatement() that takes parameters indicating where its result sets should be scrollable or not and whether they reflect concurrent changes in the underlying table The section on result sets later in this chapter describes these features in more detail
JSP: The Complete Reference
Once a statement is created, it can be used to execute commands Four methods exist for doing this: executeUpdate, executeQuery, execute, and executeBatch The choice of which method to use depends on the expected results: I executeUpdate is intended for use with the SQL INSERT, UPDATE, or DELETE statements, or with data definition statements such as CREATE TABLE It returns a count of the number of rows updated I executeQuery is used to execute an SQL SELECT statement and to return a result set I execute can be used for either purpose, but is intended for those statements that return either an update count, multiple result sets, or some combination It returns a boolean flag that indicates whether its result was an update count or a result set Additional methods are available that navigate through results I executeBatch allows multiple update statements to be executed in a batch The update counts are returned in an array The following examples illustrate each of these methods
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