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PART V
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The getConnection() method returns an object, the Connection object, which embodies the connection that has just been created and the database on the other end of that connection. Other DriverManager methods provide programmatic control over connection timeouts, switch on JDBC call logging for debugging, and perform other utility functions. If it encounters an error while attempting to make the connection, the DriverManager object will throw an exception. Error handling is described in the Error Handling in JDBC section later in this chapter.
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Part V:
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Programming with SQL
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Method getConnection()
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Description Creates and returns a database connection object, given a URL for the datasource, and optionally a user name and password, and connection properties Registers a driver with JDBC driver manager Sets timeout for connection login Obtains login timeout value Enables tracing of JDBC calls
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registerDriver() setLoginTimeout() getLoginTimeout() setLogWriter()
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TABLE 19-14
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DriverManager Object Methods
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FIGURE 19-37
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Key objects used by the JDBC API
19:
SQL APIs
Method close() createStatement() prepareStatement() prepareCall() commit() rollback() setAutoCommit() getWarnings() getMetaData
TABLE 19-15
Description Closes the connection to the datasource Creates a Statement object for the connection Prepares a parameterized SQL statement into a PreparedStatement for execution Prepares a parameterized call to a stored procedure or function into a CallableStatement for execution Commits the current transaction on the connection Rolls back the current transaction on the connection Sets/resets autocommit mode on the connection Retrieves SQL warning(s) associated with a connection Returns a DatabaseMetaData object with info about database
JDBC Connection Object Methods
The major functions of the JDBC Connection object are to manage the connection to the database, to create SQL statements for processing by that database, and to manage transactions over the connection. Table 19-15 shows the Connection object methods that provide these functions. In most simple JDBC programs, the next step after a connection has been established will be to call the Connection object s createStatement() method to create a Statement object. The major function of a Statement object is to actually execute SQL statements. Table 19-16 shows the Statement object methods that you use to control statement execution. There are several different execute() methods, depending on the specific type of SQL statement. Simple statements that do not produce query results (e.g., UPDATE, DELETE, INSERT, CREATE TABLE) can use the executeUpdate method. Queries use the executeQuery() method, because it provides a mechanism for returning the query results. Other execute() methods support prepared SQL statements, statement parameters, and stored procedures. To illustrate the basic use of Connection and Statement objects, here is a simple Java program excerpt that creates a connection to a database, performs two database updates, commits the changes, and then closes the connection:
// The connection object and strings we will use Connection dbconn; // the database connection String str1 = "UPDATE OFFICES SET TARGET = 0"; String str2 = "DELETE FROM SALESREPS WHERE EMPL_NUM = 106"; <code in here creates the connection> // Create a statement object for executing SQL Statement stmt = dbconn.createStatement();
JDBC Basic Statement Processing
PART V
Part V:
Programming with SQL
// Update the OFFICES table with the statement object stmt.executeUpdate(str1); // Update the SALESREPS table with the statement object stmt.executeUpdate(str2); // Commit the changes to the database dbconn.commit(); // Update the SALESREPS table using the same statement object stmt.executeUpdate(str2); // Finally, close the connection dbconn.close();
As the example shows, the SQL transaction-processing operations (commit and rollback) are handled by method calls to the Connection object, rather than by executing COMMIT and ROLLBACK statements. This allows the JDBC driver to know the status of the transactions that it is processing without examining the specific SQL being executed. JDBC also supports an autocommit mode, in which every statement is treated as an individual transaction. A Connection object method also controls this option.
Method Basic statement execution executeUpdate() executeQuery() execute() Statement batch execution addBatch() executeBatch() Query results limitation setMaxRows() getMaxRows() setMaxFieldSize() getMaxFieldSize() setQueryTimeout() getQueryTimeout() Error handling getWarnings()
TABLE 19-16
Description Executes a nonquery SQL statement and returns the number of rows affected Executes a single SQL query and returns a result set General-purpose execution of one or more SQL statements Stores previously supplied parameter values as part of a batch of values for execution Executes a sequence of SQL statements; returns an array of integers indicating the number of rows impacted by each one Limits number of rows retrieved by a query Retrieves current maximum row limit setting Limits maximum size of any retrieved column Retrieves current maximum field size limit Limits maximum time of query execution Retrieves current maximum query time limit Retrieves SQL warning(s) associated with statement execution
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