Package: java.sql.* |
Product: JDK |
Release: 1.1.x |
Related Links: |
General
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CallableStatement
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1. JDK 1.1 Where to get Java Development Kit? http://java.sun.com, version 1.1 incudes the java.sql.* and sun.jdbc.odbc.* drivers. Install them under the d:/java directory. 2. JDBC-ODBC Bridge Consists of two packages. 1.win95; 32-bits odbc drivers. Are delivered with the MS-Office CD. Run setup on CD and goto Add/Remove components. Select Converters, Filters, and Data Access, and select all. Press Continue. 2.jdbc-odbc brigde; Intersolv has made an jdbc-odbc brigde for general use with ms-access. The bridge consists of two .dll's jdbcodbc.dll, jdbcodbc_g.dll and Netscape_jdbcodbc.dll. After downloading proceed with step 3. 3. SYSTEM ENVIRONMENT 1.Copy the JdbcOdbc.zip file into your Java home directory (i.e. c:\java). This file contains all of the JDBC class files for the driver as well as the operating system dependent libraries and sample source code. 2.Unzip the JdbcOdbc.zip file, using the directory names stored in the ZIP file (be sure to use an unzip program that preserves long file names, such as WinZIP). This process creates the following subdirectory structure beneath your Java home directory: Directory Contains --------- ---------------------------------------------- java\sql The JDBC API classes provided by JavaSoft sun\jdbc\odbc The JDBC-ODBC Bridge classes, libraries, and sample source code 3.Copy the JdbcOdbc.dll library (in sun\jdbc\odbc\win32) to a directory on your library path (i.e. c:\windows\system). 4.If you will be using the JDBC-ODBC Bridge with Netscape 3.0, copy the Netscape_JdbcOdbc.dll library (in sun\jdbc\odbc\win32) in the program\java\bin subdirectory under the Netscape 3.0 home directory. Note that if you are using the JDBC-ODBC Bridge with Netscape 3.0, the Java home directory is program\java\classes under your Netscape 3.0 home directory. Applets must be loaded from your CLASSPATH or from the program\java\classes directory in order to use the JDBC-ODBC Bridge. Back to top 4. 32-BITS ODBC DRIVER CONFIGURATION 1.In windows 95 goto your control panel and select the 32-bits ODBC Driver. Now add System DSN (Data Source Name) by pressing System DSN and Add. Select Microsoft Access Driver (*.mbd). Fill out the form; Data Source Name, Description and press select to make link to the actual database on your harddrive. The Data Source Name we'll use in our Java Source Code to make a connection with the ODBC. Our settings are: data source name = Noorderwind (Northwind) description = default database for ms-access select path = c:/msoffice/access/nwind.mdb 5. Java Code For Accessing Database 1.Making the link to the jdbcodbc.class which will talk with the right *.dll. public NorthWind() { // Load the JDBC-ODBC bridge driver try { Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver"); } catch( ClassNotFoundException ee) { ee.printStackTrace(); } } 2.open a data source name by means of the jdbcodbcdriver. static void open() throws SQLException { // ODBC data source name String dsn = "jdbc:odbc:Nooderwind"; String user = "admin"; String password = ""; // Connect to the database con = DriverManager.getConnection(dsn, user, password); // Shut off autocommit con.setAutoCommit(false); } 3.executing a query on the opened connection. static void select(String whereClause) { Statement stmt; // SQL statement object String query; // SQL select string ResultSet rs; // SQL query results boolean more; // "more rows found" switch String v1, v2, v3; // Temporary storage results results = new Vector( 10 ); query = "SELECT EmployeeId, LastName, FirstName, Title " + "FROM Employees " + whereClause; try { stmt = con.createStatement(); rs = stmt.executeQuery(query); // Check to see if any rows were read more = rs.next(); if (!more) { System.out.println("No rows found."); return; } // Loop through the rows retrieved from the query while (more) { v1 = "ID: " + rs.getInt("EmployeeId"); v2 = "Name: " + rs.getString("FirstName") + " " + rs.getString("LastName"); v3 = "Title: " + rs.getString("Title"); System.out.println( v1 ); System.out.println( v2 ); System.out.println( v3 ); System.out.println(""); results.addElement( v1 + "\n" + v2 + "\n" + v3 + "\n"); more = rs.next(); } rs.close(); stmt.close(); } catch (SQLException e) { System.out.println("" + results.size() + " results where found."); } |