JDBC中Statement,PreparedStatement,CallableStatement三个方法的实例

public void ListStudents() throws SQLException{ 　int i, NoofColumns; 　String StNo, StFName, StLName; 　//初始化并加载JDBC-ODBC驱动程序 　Class.forName("jdbc.odbc.JdbcOdbcDriver"); 　//创建连接对象 　Connection Ex1Con = DriverManager.getConnection("jdbc:odbc:StudentDB";uid="admin";pw="sa"); 　//创建一个简单的Statement对象 　Statement Ex1Stmt = Ex1Con.createStatement(); 　//创建SQL串，传送到DBMS并执行SQL语句 　ResultSet Ex1rs = Ex1Stmt.executeQuery("SELECT StudentID, FirstName, LastName FROM Students"); 　//处理每一个数据行，直到不再有数据行 　System.out.println("Student Number　　 First Name　　 Last Name"); 　while(Ex1rs.next()){ 　//将列值保存到java变量中 　StNo = Ex1rs.getString(1); 　StFName = Ex1rs.getString(2); 　StLName = Ex1rs.getString(3); 　System.out.println(StNo, StFName, StLName); 　} } public void UpdateStudentName(String StFName, String StLName, String StNo) throws SQLException, ClassNotFoundException { 　int RetValue; 　//初始化并加载JDBC-ODBC驱动程序 　Class.forName("jdbc.odbc.JdbcOdbcDriver"); 　//创建连接对象 　Connection Ex1Con = DriverManager.getConnection("jdbc:odbc:StudentDB";uid="admin";pw="sa"); 　//创建一个简单的Statement对象 　Statement Ex1Stmt = Ex1Con.createStatement(); 　//创建SQL串，传送到DBMS并执行该SQL语句 　String SQLBuffer = "UPDATE Students SET FirstName = " + 　StFName + ",LastName = " + StLName + 　"WHERE StudentNumber = " + StNo; 　RetValue = Ex1Stmt.executeUpdate(SQLBuffer); 　System.out.println("Updated" + RetValue + "rows in the Database."); } //使用PreparedStatement改进实例 //Declare class variables Connection Con; PreparedStatement PrepStmt; boolean Initialized = false; public void InitConnection() throws SQLException, ClassNotFoundException{ 　//Initialize and load the JDBC-ODBC driver. 　Class.forName("jdbc.odbc.JdbcOdbcDriver"); 　//Make the connection object. 　Con = DriverManager.getConnection("jdbc:odbc:StudentDB";uid="admin";pw="sa"); 　//Create a prepared Statement object. 　PrepStmt = Con.prepareStatement("SELECT ClassName, Location, DaysAndTimes FROM Classes WHERE ClassName = ?"); 　Initialized = true; } public void ListOneClass(String ListClassName) throws SQLException, ClassNotFoundException{ 　int i, NoOfColumns; 　String ClassName, ClassLocation, ClassSchedule; 　if(!Initialized){ 　InitConnection(); 　} 　//Set the SQL parameter to the one passed into this method 　PrepStmt.setString(1, ListClassName); 　ResultSet Ex1rs = PrepStmt.executeQuery(); 　//Process each row until there are no more rows and display the results on the console. 　System.out.println("Class Location Schedule"); 　while(Ex1rs.next()){ 　ClassName = Ex1rs.getString(1); 　ClassLocation = Ex1rs.getString(2); 　ClassSc

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