Database Access in Java

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Database Access
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Connection con = null; try { // Connect to the composers database con = DriverManagergetConnection ("jdbc:odbc:composers"); Statement stmt = concreateStatement(); // Clear the existing table and create a new one stmtexecuteUpdate("DROP TABLE over90"); stmtexecuteUpdate( " CREATE TABLE over90" + " (" + " lastName VARCHAR(20)," + " firstName VARCHAR(20)," + " age INTEGER" + " )" ); // Set up for handling all-or-nothing transaction consetAutoCommit(false); // Add insert statements to a batch stmtclearBatch(); stmtaddBatch("INSERT INTO over90 VALUES" + "('Rodrigo','Joaquin',99)"); stmtaddBatch("INSERT INTO over90 VALUES" + "('Gossec','Francois-Joseph',96)"); stmtaddBatch("INSERT INTO over90 VALUES" + "('Ruggles','Carl',96)"); stmtaddBatch("INSERT INTO over90 VALUES" + "('Widor','Charles-Marie',94)"); stmtaddBatch("INSERT INTO over90 VALUES" + "('Sibelius','Jean',93)"); stmtaddBatch("INSERT INTO over90 VALUES" + "('Copland','Aaron',91)"); stmtaddBatch("INSERT INTO over90 VALUES"
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+ "('Auber','Daniel Francois',90)"); stmtaddBatch("INSERT INTO over90 VALUES" + "('Stravinsky','Igor',90)"); // Execute the batch and check the update counts int[] counts = stmtexecuteBatch(); boolean allGood = true; for (int i = 0; i < countslength; i++) if (counts[i] != 1) allGood = false; // Commit or roll back the transaction if (allGood) { Systemoutprintln ("Transaction successful with " + countslength + " statements committed"); concommit(); } else { Systemoutprintln("Transaction failed"); conrollback(); } // Done stmtclose(); } finally { if (con != null) conclose(); } } }
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Setting off the connection s autoCommit flag enables us either to commit or rollback the batch update as a whole
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javasqlPreparedStatement is a subinterface of Statement that uses precompiled SQL This may result in performance improvements if the statement is used repeatedly A PreparedStatement differs from Statement in that its execute methods don t take a SQL string as a parameter Instead, the SQL string is specified when the PreparedStatement is created, as shown here: PreparedStatement pstmt = conprepareStatement(sqlstring); The string to be executed may contain substitution parameters, which are indicated by the presence of a question mark ( ) in the string These parameters act as placeholders in the statement and must be filled in with values before they are executed To do this, the API provides a number of setXXX() methods, where XXX is the Java data type The batch update example, which created and loaded a table of composers who lived to at least the age of 90, could also be written with a PreparedStatement that is executed in a loop, as shown here:
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import javaio*; import javasql*; import javautil*; public class PreparedStatementExample { public static void main(String[] args) throws ClassNotFoundException, SQLException, IOException { String DRIVER = "sunjdbcodbcJdbcOdbcDriver"; String URL = "jdbc:odbc:composers"; Connection con = null; try { // Load the driver class ClassforName(DRIVER); // Connect to the database con = DriverManagergetConnection(URL); // Create the new table
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Statement stmt = concreateStatement(); try { stmtexecuteUpdate("DROP TABLE OVER90"); } catch (SQLException ignore){} stmtexecuteUpdate( " CREATE TABLE over90" + " (" + " lastName VARCHAR(20)," + " firstName VARCHAR(20)," + " age INTEGER" + " )" ); stmtclose(); stmt = null; // Prepare a statement to do inserts into the table PreparedStatement pstmt = conprepareStatement( "INSERT INTO over90 VALUES( , , )" ); // Read composer names and ages from a file // that uses tabs to separate the fields BufferedReader in = new BufferedReader( new FileReader("over90txt")); while (true) { String line = inreadLine(); if (line == null) break; // Split the line into the last name, first name // and age tokens StringTokenizer st = new StringTokenizer(line, "\t"); if (stcountTokens() != 3) throw new IOException ("Expected 3 fields");
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Database Access
String lastName = stnextToken(); String firstName = stnextToken(); int age = IntegerparseInt(stnextToken()); // Set the parameters in the prepared statement pstmtsetString(1, lastName); pstmtsetString(2, firstName); pstmtsetInt(3, age); // Update the record pstmtexecuteUpdate(); Systemoutprintln( Added record for " + firstName + " " + lastName); } inclose(); JSP IN ACTION pstmtclose(); pstmt = null; } finally { if (con != null) conclose(); } } }
Consider several key points in the code First, the statement needs to be created with substitution parameters:
PreparedStatement pstmt = conprepareStatement( "INSERT INTO over90 VALUES( , , )" );
Three question marks are here, one for each column in the table Notice no difference exists in use between numeric and string parameters Both are coded simply as question marks, with no embedded quotes or apostrophes needed
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