Examples of org.apache.empire.db.DBCommand.select()

org.apache.empire.db.DBCommand.select()
Adds a DBColumnExpr object to the Vector: 'select'. @param expr the DBColumnExpr object

  }


  private boolean databaseExists(Connection conn) {
    // Check wether DB exists
    DBCommand cmd = sampleDB.createCommand();
    cmd.select(sampleDB.T_DEPARTMENTS.count());
    try {
      return (sampleDB.querySingleInt(cmd, -1, conn) >= 0);
    } catch (QueryFailedException e) {
      return false;
    }

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            SampleAdvDB db = (SampleAdvDB)getDatabase();
            SampleAdvDB.EmployeeDepartmentHistory T_EDH = db.T_EMP_DEP_HIST;
            
            // Define the sub query
            DBCommand cmd = db.createCommand();
            cmd.select (T_EDH.C_EMPLOYEE_ID, T_EDH.C_DATE_FROM.max());
            cmd.groupBy(T_EDH.C_EMPLOYEE_ID);
            return cmd;
        }
    }

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            SampleAdvDB.Departments T_DEP = db.T_DEPARTMENTS;


            // Define the query
            DBCommand cmd = db.createCommand();
            // Select required columns
            cmd.select(T_EMP.C_EMPLOYEE_ID);
            cmd.select(T_DEP.C_DEPARTMENT_ID);
            cmd.select(T_EMP.C_LASTNAME.append(", ")
                       .append(T_EMP.C_FIRSTNAME.coalesce(DBDatabase.EMPTY_STRING))
                       .append(" (").append(T_DEP.C_NAME).append(")"));
            // Set Joins

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            // Define the query
            DBCommand cmd = db.createCommand();
            // Select required columns
            cmd.select(T_EMP.C_EMPLOYEE_ID);
            cmd.select(T_DEP.C_DEPARTMENT_ID);
            cmd.select(T_EMP.C_LASTNAME.append(", ")
                       .append(T_EMP.C_FIRSTNAME.coalesce(DBDatabase.EMPTY_STRING))
                       .append(" (").append(T_DEP.C_NAME).append(")"));
            // Set Joins
            cmd.join(T_EDH.C_EMPLOYEE_ID, V_EDS.C_EMPLOYEE_ID)

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            // Define the query
            DBCommand cmd = db.createCommand();
            // Select required columns
            cmd.select(T_EMP.C_EMPLOYEE_ID);
            cmd.select(T_DEP.C_DEPARTMENT_ID);
            cmd.select(T_EMP.C_LASTNAME.append(", ")
                       .append(T_EMP.C_FIRSTNAME.coalesce(DBDatabase.EMPTY_STRING))
                       .append(" (").append(T_DEP.C_NAME).append(")"));
            // Set Joins
            cmd.join(T_EDH.C_EMPLOYEE_ID, V_EDS.C_EMPLOYEE_ID)
              .where(T_EDH.C_DATE_FROM.is(V_EDS.C_MAX_DATE_FROM));

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    }


  private void databaseExists(Connection conn) {
    // Check wether DB exists
    DBCommand cmd = db.createCommand();
    cmd.select(db.T_DEPARTMENTS.count());
    db.querySingleInt(cmd, -1, conn);
  }
  
  /*
   * creates a DDL Script for the entire SampleDB Database then checks if the

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    public Options getFieldOptions(DBColumn column)
    {
        if (column.equals(T.C_DEPARTMENT_ID)) {
            SampleDB db = (SampleDB)getDatabase();
            DBCommand cmd = db.createCommand();
            cmd.select(db.T_DEPARTMENTS.C_DEPARTMENT_ID);
            cmd.select(db.T_DEPARTMENTS.C_NAME);
            return db.queryOptionList(cmd, context.getConnection());
        }
        // base class implementation
        return super.getFieldOptions(column);

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    {
        if (column.equals(T.C_DEPARTMENT_ID)) {
            SampleDB db = (SampleDB)getDatabase();
            DBCommand cmd = db.createCommand();
            cmd.select(db.T_DEPARTMENTS.C_DEPARTMENT_ID);
            cmd.select(db.T_DEPARTMENTS.C_NAME);
            return db.queryOptionList(cmd, context.getConnection());
        }
        // base class implementation
        return super.getFieldOptions(column);
    }

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            // STEP 7: read from Employee_Info_View
            System.out.println("--------------------------------------------------------");
            System.out.println("*** read from EMPLOYEE_INFO_VIEW ***");
            DBCommand cmd = db.createCommand();
            cmd.select (db.V_EMPLOYEE_INFO.getColumns());
            cmd.orderBy(db.V_EMPLOYEE_INFO.C_NAME_AND_DEP);
            printQueryResults(cmd, conn);


            // STEP 8: prepared Statement sample
            System.out.println("--------------------------------------------------------");

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     */
    private static boolean databaseExists(Connection conn)
    {
        // Check whether DB exists
        DBCommand cmd = db.createCommand();
        cmd.select(T_DEP.count());
        // Check using "select count(*) from DEPARTMENTS"
        System.out.println("Checking whether table DEPARTMENTS exists (SQLException will be logged if not - please ignore) ...");
        return (db.querySingleInt(cmd, -1, conn) >= 0);
    }

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