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

        DBCommand cmd = db.createCommand();
        // Create cmd parameters
        DBCmdParam curDepParam = cmd.addParam(); // Current Department
        DBCmdParam genderParam = cmd.addParam(); // Gender ('M' or 'F')
        // Define the query
        cmd.select(T_EMP.C_FULLNAME);
        cmd.join  (T_EMP.C_EMPLOYEE_ID, db.V_EMPLOYEE_INFO.C_EMPLOYEE_ID);
        cmd.where (T_EMP.C_GENDER.is(genderParam));
        cmd.where (db.V_EMPLOYEE_INFO.C_CURRENT_DEP_ID.is(curDepParam));


        System.out.println("Perfoming two queries using a the same command with different parameter values.");

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        // Define the query
        DBCommand cmd = db.createCommand();
        // Define shortcuts for tables used - not necessary but convenient
        SampleAdvDB.Employees EMP = T_EMP;
        // Select required columns
        cmd.select(T_EMP.getColumns());
        // Set Constraints
        cmd.where(T_EMP.C_RETIRED.is(false));


        // Query Records and print output
        DBReader reader = new DBReader();

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    private static HashMap<Integer, DBRecord> bulkReadRecords(Connection conn)
    {
        // Define the query
        DBCommand cmd = db.createCommand();
        // Select required columns
        cmd.select(T_EMP.getColumns());
        // Set Constraints
        cmd.where(T_EMP.C_RETIRED.is(false));


        // Query Records and print output
        DBReader reader = new DBReader();

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    private static void querySample(Connection conn, int employeeId)
    {
        // Define the sub query
        DBCommand subCmd = db.createCommand();
        DBColumnExpr MAX_DATE_FROM = T_EDH.C_DATE_FROM.max().as(T_EDH.C_DATE_FROM);
        subCmd.select(T_EDH.C_EMPLOYEE_ID, MAX_DATE_FROM);
        subCmd.groupBy(T_EDH.C_EMPLOYEE_ID);
        DBQuery Q_MAX_DATE = new DBQuery(subCmd);


        // Define the query
        DBCommand cmd = db.createCommand();

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        DBQuery Q_MAX_DATE = new DBQuery(subCmd);


        // Define the query
        DBCommand cmd = db.createCommand();
        // Select required columns
        cmd.select(T_EMP.C_EMPLOYEE_ID, T_EMP.C_FULLNAME);
        cmd.select(T_EMP.C_GENDER, T_EMP.C_PHONE_NUMBER);
        cmd.select(T_DEP.C_DEPARTMENT_ID, T_DEP.C_NAME, T_DEP.C_BUSINESS_UNIT);
        cmd.select(T_EMP.C_UPDATE_TIMESTAMP, T_DEP.C_UPDATE_TIMESTAMP);
        // Set Joins
        cmd.join(T_EDH.C_EMPLOYEE_ID, Q_MAX_DATE.findQueryColumn(T_EDH.C_EMPLOYEE_ID))

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        // Define the query
        DBCommand cmd = db.createCommand();
        // Select required columns
        cmd.select(T_EMP.C_EMPLOYEE_ID, T_EMP.C_FULLNAME);
        cmd.select(T_EMP.C_GENDER, T_EMP.C_PHONE_NUMBER);
        cmd.select(T_DEP.C_DEPARTMENT_ID, T_DEP.C_NAME, T_DEP.C_BUSINESS_UNIT);
        cmd.select(T_EMP.C_UPDATE_TIMESTAMP, T_DEP.C_UPDATE_TIMESTAMP);
        // Set Joins
        cmd.join(T_EDH.C_EMPLOYEE_ID, Q_MAX_DATE.findQueryColumn(T_EDH.C_EMPLOYEE_ID))
          .where(T_EDH.C_DATE_FROM.is(Q_MAX_DATE.findQueryColumn(MAX_DATE_FROM)));

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        // Define the query
        DBCommand cmd = db.createCommand();
        // Select required columns
        cmd.select(T_EMP.C_EMPLOYEE_ID, T_EMP.C_FULLNAME);
        cmd.select(T_EMP.C_GENDER, T_EMP.C_PHONE_NUMBER);
        cmd.select(T_DEP.C_DEPARTMENT_ID, T_DEP.C_NAME, T_DEP.C_BUSINESS_UNIT);
        cmd.select(T_EMP.C_UPDATE_TIMESTAMP, T_DEP.C_UPDATE_TIMESTAMP);
        // Set Joins
        cmd.join(T_EDH.C_EMPLOYEE_ID, Q_MAX_DATE.findQueryColumn(T_EDH.C_EMPLOYEE_ID))
          .where(T_EDH.C_DATE_FROM.is(Q_MAX_DATE.findQueryColumn(MAX_DATE_FROM)));
        cmd.join(T_EMP.C_EMPLOYEE_ID, T_EDH.C_EMPLOYEE_ID);

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        DBCommand cmd = db.createCommand();
        // Select required columns
        cmd.select(T_EMP.C_EMPLOYEE_ID, T_EMP.C_FULLNAME);
        cmd.select(T_EMP.C_GENDER, T_EMP.C_PHONE_NUMBER);
        cmd.select(T_DEP.C_DEPARTMENT_ID, T_DEP.C_NAME, T_DEP.C_BUSINESS_UNIT);
        cmd.select(T_EMP.C_UPDATE_TIMESTAMP, T_DEP.C_UPDATE_TIMESTAMP);
        // Set Joins
        cmd.join(T_EDH.C_EMPLOYEE_ID, Q_MAX_DATE.findQueryColumn(T_EDH.C_EMPLOYEE_ID))
          .where(T_EDH.C_DATE_FROM.is(Q_MAX_DATE.findQueryColumn(MAX_DATE_FROM)));
        cmd.join(T_EMP.C_EMPLOYEE_ID, T_EDH.C_EMPLOYEE_ID);
        cmd.join(T_DEP.C_DEPARTMENT_ID, T_EDH.C_DEPARTMENT_ID);

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    private boolean databaseExists(Connection conn)
    {
        // Check wether DB exists
        DBCommand cmd = db.createCommand();
        cmd.select(db.DEPARTMENTS.count());
        int deps = db.querySingleInt(cmd, -1, conn);
        return (deps >= 0);
    }


    /*

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    }


    public List<Employee> searchEmmployee(Integer id, String firstName, String lastName, Integer department)
    {
        DBCommand cmd = db.createCommand();
        cmd.select(T_EMP.getColumns());


        DBCompareExpr comp;


        if (id != null)
            comp = T_EMP.EMPLOYEE_ID.is(id);

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