lab1monday

ddc34297 · Clemens Kupke · 9e117ced · ddc34297 · ddc34297 · ddc34297
Commit ddc34297 authored 6 years ago by Clemens Kupke
--- a/lab1mon/lab11.sql
+++ b/lab1mon/lab11.sql
+/* prompt the user for a value */
+\prompt 'Enter the lowest value for employee number!' enumber
+
+
+/* execute the query on the database */
+SELECT TO_CHAR ( current_date, 'DD/Mon/YY' ) TODAY ,
+EMPNO, DEPTNO, ENAME, SAL
+FROM EMP
+WHERE EMPNO >= (:enumber);
--- a/lab1mon/lab12.sql
+++ b/lab1mon/lab12.sql
+
+CREATE OR REPLACE FUNCTION add_salaries() 
+RETURNS emp.sal%TYPE AS 
+
+$$
+
+DECLARE
+   salary emp.sal%TYPE;
+   maxsal emp.sal%TYPE;
+   c_emp CURSOR FOR select sal from emp where empno >= 7700;
+
+BEGIN
+ maxsal = 0;
+ OPEN c_emp;
+  LOOP 
+  FETCH c_emp INTO salary;
+    EXIT WHEN NOT FOUND; 
+  maxsal = GREATEST(total,maxsal);
+  END LOOP; 
+ CLOSE c_emp; 
+ RETURN total;
+END;
+$$
+
+LANGUAGE 'plpgsql';
+
--- a/lab1mon/lab13.java
+++ b/lab1mon/lab13.java
+import java.net.URL;
+import java.sql.*;
+
+
+public class lab13
+{
+	static final int iMaxNumRows = 100;
+
+	Connection con;
+	Driver driver = null;
+	CallableStatement cstmt;
+	ResultSet result;
+	PreparedStatement pstmt;
+	static String name = new String("");
+	static String sUserPwd = new String("");
+	static String sDatabase = new String("");
+
+	// EMP table columns
+	static int aiEMEmpNo[] = new int[iMaxNumRows];
+	static String asEMEName[] = new String[iMaxNumRows];
+	static int aiEMDeptNo[] = new int[iMaxNumRows];
+	static int afEMSal[] = new int[iMaxNumRows];
+
+	// counter for number of rows in each table
+	int iNumDept = 0;
+	int iNumSalGrade = 0;
+	int iNumEmp = 0;
+
+	private void connect(String sTypeJDBC) throws Exception {
+        
+		String url;
+		try {
+      		// Create a new JDBC connection.  This is our session.
+			url = "jdbc:postgresql://devweb2018.cis.strath.ac.uk:5432/postgres";
+			con = DriverManager.getConnection(url,name,sUserPwd);
+			con.setAutoCommit(false); 
+		} catch(Exception e) {
+			System.err.println("System Exception in connect");
+			e.printStackTrace();
+	      	throw e;
+    	}
+	}                                    
+
+  	public void closeConnection() throws Exception
+  	{
+    	try {
+			con.close();
+    	} catch (Exception e) {
+			System.err.println("System Exception in closeConnection");
+			e.printStackTrace();
+		}
+	}        
+
+
+
+	public String listEmp () throws Exception{
+		String retVal = new String("NUMBER\tNAME\tDEPTNO\tSALARY\n");
+
+		try {
+			pstmt = con.prepareStatement(
+				"SELECT EMPNO, ENAME,  SAL, DEPTNO FROM EMP");
+			result = pstmt.executeQuery();
+
+			int i = 0;
+			while (result.next()) {
+				aiEMEmpNo[i] = result.getInt("EMPNO");
+				asEMEName[i] = result.getString("ENAME");
+				afEMSal[i] = result.getInt("SAL");
+				aiEMDeptNo[i] = result.getInt("DEPTNO");
+				retVal = retVal + aiEMEmpNo[i] + "\t" +
+					asEMEName[i] + "\t" + aiEMDeptNo[i] + "\t" +
+					afEMSal[i] + "\n"; 
+				i++;
+			}
+			iNumEmp = i;
+	    	pstmt.close();
+		} 
+		catch (Exception e) {
+			System.err.println("System Exception in listEmp");
+			e.printStackTrace();
+			throw e;
+		}
+		return(retVal);
+	}
+
+
+
+
+	public static String runQuery (String sTypeJDBC, String sTable)
+	{
+		String retVal = new String();
+		lab13 myQuery = new lab13();
+		try {
+			myQuery.connect(sTypeJDBC);
+			retVal = myQuery.listEmp();
+			myQuery.closeConnection();
+		} 
+		catch (Exception e) {
+			System.err.println("System Exception in runQuery");
+			e.printStackTrace();
+			retVal = "System Exception in runQuery";
+		}
+		return(retVal);
+	}
+
+
+	public static void main (String argv[])
+	{
+		String sTable = new String();
+		if ( argv.length == 2 ) {
+                        name = argv[0];
+			sUserPwd = argv[1];
+			//sDatabase = argv[1];
+			System.out.println(runQuery("client", sTable));
+		}
+		else {
+			System.out.println("Usage: java lab13 <username> <password>"); 
+		}
+	}
+}
--- a/lab1mon/lab14.jsp
+++ b/lab1mon/lab14.jsp
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html401/loose.dtd">
+<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
+<%@ page 
+	import = "java.sql.*"
+%>
+<title>JSP Example </title></head><body><table>
+<%	
+	Class.forName("org.postgresql.Driver");
+	Connection dbconn = DriverManager.getConnection( "jdbc:postgresql://devweb2018.cis.strath.ac.uk:5432/postgres","<USERNAME>","<PASSWORD>");
+	Statement sql = dbconn.createStatement();
+	ResultSet results = sql.executeQuery("SELECT ename FROM emp where empno >= 7700");
+	while(results.next())
+		{		
+		out.println("<tr><td>"); 
+		out.println(results.getString(1));
+		out.println("</td></tr>"); 
+		}					
+%>
+</table></body></html>
+
--- a/lab1mon/lab1ex2.sql
+++ b/lab1mon/lab1ex2.sql
+
+CREATE OR REPLACE FUNCTION add_population() RETURNS <ENTER> AS 
+
+$$
+
+DECLARE
+   popul <ENTER>;
+   total <ENTER>;
+   c_pop CURSOR FOR <ENTER>;
+
+BEGIN
+ total = 0;
+ OPEN c_pop;
+  LOOP 
+  FETCH c_pop INTO popul;
+    EXIT WHEN NOT FOUND; 
+  total = total + popul;
+  END LOOP; 
+ CLOSE c_pop; 
+ RETURN total;
+END;
+$$
+
+LANGUAGE 'plpgsql';
+