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In the real world, the DBMS may not be available at the time your program needs to connect to it This is typically caused by a high demand for the DBMS at the moment your program tries to connect to it It is not too unusual for a program to end up on a seemingly never-ending line waiting for a turn to connect to the DBMS Rather than wait forever, you can set a timeout period after which the DriverManager ceases its attempt to connect to the DBMS You set the timeout period by calling the DriverManagersetLogin Timeout() method This method requires that you pass the number of seconds for it to wait before timing out You can find out the current timeout period by calling the DriverManager getLoginTimeout() method This method returns an integer that represents the number of seconds the DriverManager waits before timing out
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Previously in this chapter, you learned that after you open a connection to the DBMS, you call the createStatement() method, which returns an instance of the Statement class The instance of the Statement class is used to call the executeQuery() method, which sends your SQL query to the DBMS
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Three types of statement objects can be used to execute the query: Statement, PreparedStatement, and CallableStatement The Statement statement object executes a query immediately when the query is executed The query is compiled before it is executed by the DBMS The PreparedStatement statement object is used to execute a compiled query A compiled query is one in which the statements in the query are already translated into code understood by the DBMS The CallableStatement statement object is used to execute a stored procedure A stored procedure is a query written by a programmer that is stored in the DBMS You execute a stored procedure by sending an SQL query to the DBMS that tells the DBMS to run a specific stored procedure This is faster to execute than a regular SQL query When a regular SQL query executes, your program must send the query to the DBMS, where it is compiled and then executed When a stored procedure is executed, you don t send the full query because it already resides in the DBMS Instead, you send the command to run the stored procedure followed by the name of the stored procedure
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The Statement Object
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Use the Statement object when you need to execute a query immediately You execute a query that uses the Statement object by calling the executeQuery() method, which you ve seen previously in this chapter If the query is inserting a new row or updating or deleting a row, you use the executeUpdate() method instead of the executeQuery() method The executeUpdate() method returns an integer that indicates the number of rows updated by the query The following example illustrates how to use the Statement object This example returns all columns in the Registration table Nothing is displayed when this program runs In order to display data retrieved from the DBMS, you need to replace the comment in the second try block with statements that read data from the resultsets, which you saw how to do earlier in this chapter
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String url = "jdbc:odbc:Registration"; String userID = "jim"; String password = "keogh"; Statement dataRequest; ResultSet results; Connection dB; try { ClassforName( "sunjdbcodbcJdbcOdbcDriver"); dB = DriverManagergetConnection(url,userID,password);
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CHAPTER 13 JDBC and Java Data Objects
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} catch (ClassNotFoundException e) { Systemerrprintln( "Unable to load the JDBC/ODBC bridge" + e); Systemexit(1); } catch (SQLException e) { Systemerrprintln( "Cannot connect to the database" + e); Systemexit(2); } try { String query = "SELECT * FROM Registration"; dataRequest = dBcreateStatement(); results = dataRequestexecuteQuery (query); //Place code here to interact with the ResultSet } catch ( SQLException e ){ Systemerrprintln("SQL error" + e); Systemexit(3); } finally { dataRequestclose(); dBclose(); }
The next example shows how to used the executeUpdate() method This program is nearly the same as the previous example, except for two statements The SQL query changes the value of a column in a particular row of a table Here s what the query is telling the DBMS to do: Update the Registration table Find the row where the value of the StudentID column is 123 When you find that row, change the value of the Enrolled column of that row to Y The other statement that is changed calls the executeUpdate() method, which is passed the SQL query that changes the value of the Enrolled column in the Registration table We must use the executeUpdate() method because the query changes the table rather than simply requesting data from the table
String url = "jdbc:odbc:Registration"; String userID = "jim"; String password = "keogh"; Statement dataRequest; Connection dB; int rowsUpdated; try {
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