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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.
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Close() createStatement() prepareStatement() prepareCall() commit() rollback() setAutoCommit() getWarnings() GetMetaData
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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
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Table 19-15.
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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.
PROGRAMMING WITH SQL // 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>
SQL: The Complete Reference
// Create a statement object for executing SQL Statement stmt = dbconn.createStatement(); // 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
Method
Basic statement execution executeUpdate() executeQuery() execute() Statement batch execution addBatch() executeBatch()
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
Table 19-16.
JDBC Statement Object Methods
19:
SQL APIs
Method
Query results limitation setMaxRows() getMaxRows() setMaxFieldSize() getMaxFieldSize() setQueryTimeout() getQueryTimeout() Error handling getWarnings()
Description
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
Table 19-16.
JDBC Statement Object Methods (continued)
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. Note that the Connection and Statement methods called in this program excerpt can cause errors, and the excerpt does not show any error-handling code. If an error occurs, the JDBC driver will throw a SQLException exception. Normally, an excerpt like the previous one (or parts of it) will appear within a try / catch structure to handle the possible exception. For simplicity, the enclosing try / catch structure is suppressed in this and the next several examples. Error-handling techniques are described in the Error Handling in JDBC section later in this chapter.
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