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

    {
        if (departments==null)
        {
            SampleDB db = getDatabase();
            DBCommand cmd = db.createCommand();
            cmd.select(db.T_DEPARTMENTS.C_DEPARTMENT_ID);
            cmd.select(db.T_DEPARTMENTS.C_NAME);
            cmd.orderBy(db.T_DEPARTMENTS.C_NAME.asc());
            departments = db.queryOptionList(cmd.getSelect(), getConnection());
        }
        return departments;

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        if (departments==null)
        {
            SampleDB db = getDatabase();
            DBCommand cmd = db.createCommand();
            cmd.select(db.T_DEPARTMENTS.C_DEPARTMENT_ID);
            cmd.select(db.T_DEPARTMENTS.C_NAME);
            cmd.orderBy(db.T_DEPARTMENTS.C_NAME.asc());
            departments = db.queryOptionList(cmd.getSelect(), getConnection());
        }
        return departments;
    }

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        SampleDB db = getDatabase();
        SampleDB.Employees EMP = db.T_EMPLOYEES;
        SampleDB.Departments DEP = db.T_DEPARTMENTS;
        
        DBCommand cmd = db.createCommand();
        cmd.select(EMP.C_EMPLOYEE_ID);
        cmd.select(C_FULL_NAME, EMP.C_GENDER, EMP.C_DATE_OF_BIRTH);
        cmd.select(C_DEPARTMENT);
        cmd.join  (DEP.C_DEPARTMENT_ID, EMP.C_DEPARTMENT_ID);


        // Set filter constraints

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        SampleDB.Employees EMP = db.T_EMPLOYEES;
        SampleDB.Departments DEP = db.T_DEPARTMENTS;
        
        DBCommand cmd = db.createCommand();
        cmd.select(EMP.C_EMPLOYEE_ID);
        cmd.select(C_FULL_NAME, EMP.C_GENDER, EMP.C_DATE_OF_BIRTH);
        cmd.select(C_DEPARTMENT);
        cmd.join  (DEP.C_DEPARTMENT_ID, EMP.C_DEPARTMENT_ID);


        // Set filter constraints
        SearchInfo si = getSearchInfo();

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        SampleDB.Departments DEP = db.T_DEPARTMENTS;
        
        DBCommand cmd = db.createCommand();
        cmd.select(EMP.C_EMPLOYEE_ID);
        cmd.select(C_FULL_NAME, EMP.C_GENDER, EMP.C_DATE_OF_BIRTH);
        cmd.select(C_DEPARTMENT);
        cmd.join  (DEP.C_DEPARTMENT_ID, EMP.C_DEPARTMENT_ID);


        // Set filter constraints
        SearchInfo si = getSearchInfo();
        if (si.getDepartmentId()!=null)

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    }


  private boolean databaseExists(Connection conn) {
    // Check wether DB exists
    DBCommand cmd = db.createCommand();
    cmd.select(db.T_DEPARTMENTS.count());
    return (db.querySingleInt(cmd.getSelect(), -1, conn) >= 0);
  }
  
  /*
   * 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.getSelect(), 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.getSelect(), context.getConnection());
        }
        // base class implementation
        return super.getFieldOptions(column);
    }

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   */
  private static boolean databaseExists(Connection conn)
    {
    // Check whether DB exists
    DBCommand cmd = db.createCommand();
    cmd.select(db.DEPARTMENTS.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.getSelect(), -1, conn) >= 0);
  }

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        else PHONE_LAST_DASH = EMP.PHONE_NUMBER.length().minus(EMP.PHONE_NUMBER.reverse().indexOf("-")).plus(2);  
        DBColumnExpr PHONE_EXT_NUMBER = EMP.PHONE_NUMBER.substring(PHONE_LAST_DASH).as("PHONE_EXTENSION");
        
        // DBColumnExpr genderExpr = cmd.select(EMP.GENDER.decode(EMP.GENDER.getOptions()).as(EMP.GENDER.getName()));
    // Select required columns
    cmd.select(EMP.EMPLOYEE_ID, EMPLOYEE_FULLNAME);
    if(db.getDriver() instanceof DBDatabaseDriverPostgreSQL)
    {
      // postgres does not support the substring expression
      cmd.select(EMP.GENDER, EMP.PHONE_NUMBER);
    }else{

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