PL/SQL ExcelDocumentType

The ExcelDocumentType is an Oracle User Defined Type (UDT) that allows a developer to generate fully functional Microsoft Excel Spreadsheets using PL/SQL directly from the database.  The spreadsheets will be encoded as Microsoft Excel 2003 XML Spreadsheets.  Microsoft Excel will recognize the files with both a .xml or .xls extension (Excel 2007 will ask user for permission to open the file if the .xls extension is used …).  The ExcelDocumentType supports the following Excel features:

• Creation of multiple worksheets
• Custom Header and Footer
• Creation of custom Excel styles (color, font, number formats, text rotation, etc.)
• Creation and application of formulas
• Worksheet titles (expanded cell)
• Worksheet naming (sheet tabs)
• Creation and application of worksheet level conditional formatting.
• Creation of hyper-linked cells (Sheet to sheet, external links, or email links).
• Custom cell attributes (in case you want to apply one that isn’t already provided).
• Freeze Column Header Row

The ExcelDocumentType provides three direct methods of document retrieval/delivery:

• The document can retrieved as a CLOB.
• The document can be streamed directly to a web browser through a PL/SQL DAD (if delivering content to the browser using PL/SQL).
• The document can be retrieved in a PL/SQL table via a user defined type called ExcelDocumentLine

The code packaged with the ExcelDocumentType includes a PL/SQL Package (API) called ExcelDocTypeUtils that makes the creation of a spreadsheet very simple.  The following examples demonstrate how to create a spreadsheet using the ExcelDocumentType directly and then using the ExcelDocTypeUtils package.

Example 1. (Without the ExcelDocTypeUtils PL/SQL package … the long way)

CREATE OR REPLACE PROCEDURE excelObjectTestWeb
ISdemoDocument     ExcelDocumentType;

documentArray    ExcelDocumentLine := ExcelDocumentLine();

BEGIN

demoDocument := ExcelDocumentType();

– Open the document
demoDocument.documentOpen;

– Define Styles

demoDocument.stylesOpen;

– Include Default Style
demoDocument.defaultStyle;

– Add Custom Styles

/* Style for Column Header Row */
demoDocument.createStyle(p_style_id =>’ColumnHeader’,
p_font     =>’Times New Roman’,
p_ffamily  =>’Roman’,
p_fsize    =>’10′,
p_bold     =>’Y',
p_underline =>’Single’,
p_align_horizontal=>’Center’,
p_align_vertical=>’Bottom’);

/* Styles for alternating row colors. */
demoDocument.createStyle(p_style_id=>’NumberStyleBlueCell’,
p_cell_color=>’Cyan’,
p_cell_pattern =>’Solid’,
p_number_format => ‘###,###,###.00′,
p_align_horizontal => ‘Right’);

demoDocument.createStyle(p_style_id=>’TextStyleBlueCell’,
p_cell_color=>’Cyan’,
p_cell_pattern =>’Solid’);

/* Style for numbers */
demoDocument.createStyle(p_style_id => ‘NumberStyle’,
p_number_format => ‘###,###,###.00′,
p_align_horizontal => ‘Right’);

/* Style for Column Sum */
demoDocument.createStyle(p_style_id => ‘ColumnSum’,
p_number_format => ‘###,###,###.00′,
p_align_horizontal => ‘Right’,
p_text_color => ‘Blue’);

/* Style for Column Sum */
demoDocument.createStyle(p_style_id => ‘RowSum’,
p_number_format => ‘###,###,###.00′,
p_align_horizontal => ‘Right’,
p_text_color => ‘Red’);

– Close Styles
demoDocument.stylesClose;

– Open Worksheet
demoDocument.worksheetOpen(‘Weekly Earnings’);

– Define Sheet Conditional Formatting values
demoDocument.worksheetCondFormatOpen(p_range=>’R2C2:R4C7′);

demoDocument.createCondFormat(p_qualifier=>’Between’,
p_value=>’0,2000 ‘,
p_format_style=>’color:green’);

demoDocument.createCondFormat(p_qualifier=>’Between’,
p_value=>’2001,10000000′,
p_format_style=>’color:red’);

demoDocument.worksheetCondFormatClose;

– Define Columns
demoDocument.defineColumn(p_index=>’1′,p_width=>30); — Emp Name
demoDocument.defineColumn(p_index=>’2′,p_width=>16); — Daily Dollar
demoDocument.defineColumn(p_index=>’3′,p_width=>16);
demoDocument.defineColumn(p_index=>’4′,p_width=>16);
demoDocument.defineColumn(p_index=>’5′,p_width=>16);
demoDocument.defineColumn(p_index=>’6′,p_width=>16);
demoDocument.defineColumn(p_index=>’7′,p_width=>16); — Sum column

– Define Header Row
demoDocument.rowOpen;

–Define Header Row Data Cells
demoDocument.addCell(p_style=>’ColumnHeader’,p_data=>’Employee Name’);
demoDocument.addCell(p_style=>’ColumnHeader’,p_data=>’Monday’);
demoDocument.addCell(p_style=>’ColumnHeader’,p_data=>’Tuesday’);
demoDocument.addCell(p_style=>’ColumnHeader’,p_data=>’Wednesday’);
demoDocument.addCell(p_style=>’ColumnHeader’,p_data=>’Thursday’);
demoDocument.addCell(p_style=>’ColumnHeader’,p_data=>’Friday’);
demoDocument.addCell(p_style=>’ColumnHeader’,p_data=>’Totals’);

demoDocument.rowClose;

/*————————————*/
/* Sheet Data would normally be       */
/* data driven via cursor loops       */
/* or other means.                    */
/* The purpose here is to demonstrate */
/* the features of the utility.       */
/*————————————*/

– Row 1
demoDocument.rowOpen;
demoDocument.addCell(p_data=>’Jason Bennett’);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’50000′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’25000′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’25000′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’14000′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’200′);
demoDocument.addCell(p_style=>’RowSum’,p_data_type=>’Number’, p_formula=>’SUM(RC[-5]:RC[-1])’);
demoDocument.rowClose;

– Row 2
demoDocument.rowOpen;
demoDocument.addCell(p_style=>’TextStyleBlueCell’,  p_data=>’Joe Smith’);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’500′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’8000′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’35′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’1000′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’15′);
demoDocument.addCell(p_style=>’RowSum’,p_data_type=>’Number’, p_formula=>’SUM(RC[-5]:RC[-1])’);
demoDocument.rowClose;

– Row 3
demoDocument.rowOpen;
demoDocument.addCell(p_data=>’Wilma Jones’);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’300′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’9000′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’350′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’2000′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’159′);
demoDocument.addCell(p_style=>’RowSum’,p_data_type=>’Number’, p_formula=>’SUM(RC[-5]:RC[-1])’);
demoDocument.rowClose;

– Row 4
demoDocument.rowOpen;
demoDocument.addCell(p_style=>’TextStyleBlueCell’,  p_data=>’Chris P.’);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’45000′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’67000′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’200′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’650′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’21000′);
demoDocument.addCell(p_style=>’RowSum’,p_data_type=>’Number’, p_formula=>’SUM(RC[-5]:RC[-1])’);
demoDocument.rowClose;

– Summary Row 5
demoDocument.rowOpen;
demoDocument.addCell(p_col_index=>’2′,p_style=>’ColumnSum’,p_data_type=>’Number’,p_formula=>’SUM(R[-4]C:R[-1]C)’);
demoDocument.addCell(p_col_index=>’3′,p_style=>’ColumnSum’,p_data_type=>’Number’,p_formula=>’SUM(R[-4]C:R[-1]C)’);
demoDocument.addCell(p_col_index=>’4′,p_style=>’ColumnSum’,p_data_type=>’Number’,p_formula=>’SUM(R[-4]C:R[-1]C)’);
demoDocument.addCell(p_col_index=>’5′,p_style=>’ColumnSum’,p_data_type=>’Number’,p_formula=>’SUM(R[-4]C:R[-1]C)’);
demoDocument.addCell(p_col_index=>’6′,p_style=>’ColumnSum’,p_data_type=>’Number’,p_formula=>’SUM(R[-4]C:R[-1]C)’);
demoDocument.addCell(p_col_index=>’7′,p_style=>’ColumnSum’,p_data_type=>’Number’,p_formula=>’SUM(R[-4]C:R[-1]C)’);
demoDocument.rowClose;

– Close the Worksheet
demoDocument.worksheetClose;

– Open New Worksheet
demoDocument.worksheetOpen(‘Weekly Earnings 2′);

– Define Columns
demoDocument.defineColumn(p_index=>’1′,p_width=>30); — Emp Name
demoDocument.defineColumn(p_index=>’2′,p_width=>16); — Daily Dollar
demoDocument.defineColumn(p_index=>’3′,p_width=>16);
demoDocument.defineColumn(p_index=>’4′,p_width=>16);
demoDocument.defineColumn(p_index=>’5′,p_width=>16);
demoDocument.defineColumn(p_index=>’6′,p_width=>16);
demoDocument.defineColumn(p_index=>’7′,p_width=>16); — Sum column

– Define Header Row
demoDocument.rowOpen;

–Define Header Row Data Cells
demoDocument.addCell(p_style=>’ColumnHeader’,p_data=>’Employee Name’);
demoDocument.addCell(p_style=>’ColumnHeader’,p_data=>’Monday’);
demoDocument.addCell(p_style=>’ColumnHeader’,p_data=>’Tuesday’);
demoDocument.addCell(p_style=>’ColumnHeader’,p_data=>’Wednesday’);
demoDocument.addCell(p_style=>’ColumnHeader’,p_data=>’Thursday’);
demoDocument.addCell(p_style=>’ColumnHeader’,p_data=>’Friday’);
demoDocument.addCell(p_style=>’ColumnHeader’,p_data=>’Totals’);

demoDocument.rowClose;

/*————————————*/
/* Sheet Data would normally be       */
/* data driven via cursor loops       */
/* or other means.                    */
/* The purpose here is to demonstrate */
/* the features of the utility.       */
/*————————————*/

– Row 1
demoDocument.rowOpen;
demoDocument.addCell(p_data=>’Jason Bennett’);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’80000′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’75000′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’25000′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’94000′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’200′);
demoDocument.addCell(p_style=>’RowSum’,p_data_type=>’Number’, p_formula=>’SUM(RC[-5]:RC[-1])’);
demoDocument.rowClose;

– Row 2
demoDocument.rowOpen;
demoDocument.addCell(p_style=>’TextStyleBlueCell’,  p_data=>’Joe Smith’);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’500′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’8000′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’35′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’1000′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’15′);
demoDocument.addCell(p_style=>’RowSum’,p_data_type=>’Number’, p_formula=>’SUM(RC[-5]:RC[-1])’);
demoDocument.rowClose;

– Row 3
demoDocument.rowOpen;
demoDocument.addCell(p_data=>’Wilma Smith’);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’500′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’77000′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’850′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’9000′);
demoDocument.addCell(p_style=>’NumberStyle’,p_data_type=>’Number’, p_data=>’359′);
demoDocument.addCell(p_style=>’RowSum’,p_data_type=>’Number’, p_formula=>’SUM(RC[-5]:RC[-1])’);
demoDocument.rowClose;

– Row 4
demoDocument.rowOpen;
demoDocument.addCell(p_style=>’TextStyleBlueCell’,  p_data=>’Jeff F.’);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’99000′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’67000′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’500′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’650′);
demoDocument.addCell(p_style=>’NumberStyleBlueCell’,p_data_type=>’Number’, p_data=>’21000′);
demoDocument.addCell(p_style=>’RowSum’,p_data_type=>’Number’, p_formula=>’SUM(RC[-5]:RC[-1])’);
demoDocument.rowClose;

– Summary Row 5
demoDocument.rowOpen;
demoDocument.addCell(p_col_index=>’2′,p_style=>’ColumnSum’,p_data_type=>’Number’,p_formula=>’SUM(R[-4]C:R[-1]C)’);
demoDocument.addCell(p_col_index=>’3′,p_style=>’ColumnSum’,p_data_type=>’Number’,p_formula=>’SUM(R[-4]C:R[-1]C)’);
demoDocument.addCell(p_col_index=>’4′,p_style=>’ColumnSum’,p_data_type=>’Number’,p_formula=>’SUM(R[-4]C:R[-1]C)’);
demoDocument.addCell(p_col_index=>’5′,p_style=>’ColumnSum’,p_data_type=>’Number’,p_formula=>’SUM(R[-4]C:R[-1]C)’);
demoDocument.addCell(p_col_index=>’6′,p_style=>’ColumnSum’,p_data_type=>’Number’,p_formula=>’SUM(R[-4]C:R[-1]C)’);
demoDocument.addCell(p_col_index=>’7′,p_style=>’ColumnSum’,p_data_type=>’Number’,p_formula=>’SUM(R[-4]C:R[-1]C)’);
demoDocument.rowClose;

– Close the Worksheet
demoDocument.worksheetClose;

– Close the document.
demoDocument.documentClose;

– Display the document to browser.
demoDocument.displayDocument;

EXCEPTION
WHEN OTHERS THEN
/* For displaying web based error.*/
htp.p(sqlerrm);

END;
/

 

Here is a link to the spreadsheet generated by the code (The file is an XML file with a .xls extension):
ExcelObjectTest.xls
Here is a screen shot of the resulting spreadsheet:

Example 2. (Using the ExcelDocTypeUtils PL/SQL package … the easy way):

/**
*  This example covers a few features:
*  – Multiple worksheets with multipe queries
*  – Creating Styles and applying them to columns
*  – Worksheet Title (spanning multiple cells)
*  – Conditional Formating for a range of cells in a worksheet
*  – Sending finished report to a web browser (call it thru a PL/SQL DAD …)
*/CREATE OR REPLACE PROCEDURE employeeReport AS

v_sql_salary        VARCHAR2(200) := ‘SELECT last_name,first_name,salary FROM hr.employees ORDER BY last_name,first_name’;
v_sql_contact       VARCHAR2(200) := ‘SELECT last_name,first_name,phone_number,email  FROM hr.employees ORDER BY last_name,first_name’;
v_sql_hiredate      VARCHAR2(200) := ‘SELECT last_name,first_name,to_char(hire_date,”MM/DD/YYYY”) hire_date FROM hr.employees ORDER BY last_name,first_name’;

excelReport         ExcelDocumentType := ExcelDocumentType();
documentArray       ExcelDocumentLine := ExcelDocumentLine();

v_worksheet_rec     ExcelDocTypeUtils.T_WORKSHEET_DATA := NULL;
v_worksheet_array   ExcelDocTypeUtils.WORKSHEET_TABLE  := ExcelDocTypeUtils.WORKSHEET_TABLE();

v_sheet_title       ExcelDocTypeUtils.T_SHEET_TITLE := NULL;

– Objects for Defining Document Styles (Optional)

v_style_def         ExcelDocTypeUtils.T_STYLE_DEF := NULL;
v_style_array       ExcelDocTypeUtils.STYLE_LIST  := ExcelDocTypeUtils.STYLE_LIST();

– Object for Defining Conditional Formating (Optional)

v_condition_rec         ExcelDocTypeUtils.T_CONDITION      := NULL;
v_condition_array       ExcelDocTypeUtils.CONDITIONS_TABLE := ExcelDocTypeUtils.CONDITIONS_TABLE();

– Conditions are applied to a range of cells … there can be more than grouping of format conditions per worksheet.
v_conditional_format_rec   ExcelDocTypeUtils.T_CONDITIONAL_FORMATS;
v_conditional_format_array ExcelDocTypeUtils.CONDITIONAL_FORMATS_TABLE := ExcelDocTypeUtils.CONDITIONAL_FORMATS_TABLE();

BEGIN

– Define Styles (Optional)
v_style_def.p_style_id     := ‘LastnameStyle’;
v_style_def.p_text_color   := ‘Red’;

ExcelDocTypeUtils.addStyleType(v_style_array,v_style_def);

v_style_def := NULL;
v_style_def.p_style_id          := ‘SheetTitleStyle’;
v_style_def.p_align_horizontal  := ‘Center’;
v_style_def.p_bold              := ‘Y’;
v_style_def.p_text_color        := ‘Green’;

ExcelDocTypeUtils.addStyleType(v_style_array,v_style_def);

v_style_def := NULL;
v_style_def.p_style_id     := ‘FirstnameStyle’;
v_style_def.p_text_color   := ‘Blue’;

ExcelDocTypeUtils.addStyleType(v_style_array,v_style_def);

– Style that includes custom borders around numbers
v_style_def := NULL;
v_style_def.p_style_id         := ‘NumberStyle’;
v_style_def.p_number_format    := ‘$###,###,###.00′;
v_style_def.p_align_horizontal := ‘Right’;
v_style_def.p_custom_xml         := ‘<Borders>’||
‘<Border ss:Position=”Left” ss:LineStyle=”Continuous” ss:Weight=”3″/>’||
‘<Border ss:Position=”Right” ss:LineStyle=”Continuous” ss:Weight=”3″/>’||
‘<Border ss:Position=”Top” ss:LineStyle=”Continuous” ss:Weight=”3″/>’||
‘<Border ss:Position=”Bottom” ss:LineStyle=”Continuous” ss:Weight=”3″/>’||
‘</Borders>’;

ExcelDocTypeUtils.addStyleType(v_style_array,v_style_def);

– Define Sheet Title
v_sheet_title.title      := ‘Employee Salary Report’;

– Must Less than or Equal to the max number of columns on the worksheet.
v_sheet_title.cell_span  := ’3′;
v_sheet_title.style      := ‘SheetTitleStyle’;

v_worksheet_rec.title    := v_sheet_title;

– Add conditional formating for Salary Ranges … color code salary amounts
– across three different ranges.

v_condition_rec.qualifier    := ‘Between’;
v_condition_rec.value        := ’0,5000′;
v_condition_rec.format_style := ‘color:red’;

ExcelDocTypeUtils.addConditionType(v_condition_array,v_condition_rec);

v_condition_rec.qualifier    := ‘Between’;
v_condition_rec.value        := ’5001,10000′;
v_condition_rec.format_style := ‘color:blue’;

ExcelDocTypeUtils.addConditionType(v_condition_array,v_condition_rec);

v_condition_rec.qualifier    := ‘Between’;
v_condition_rec.value        := ’10001,1000000′;
v_condition_rec.format_style := ‘color:green’;

ExcelDocTypeUtils.addConditionType(v_condition_array,v_condition_rec);

– Format range for Column 3 starting at row 2 and going to row 65000 …
v_conditional_format_rec.range      := ‘R2C3:R65000C3′;
v_conditional_format_rec.conditions := v_condition_array;

ExcelDocTypeUtils.addConditionalFormatType(v_conditional_format_array,v_conditional_format_rec);

v_worksheet_rec.worksheet_cond_formats := v_conditional_format_array;

– Salary
v_worksheet_rec.query             := v_sql_salary;
v_worksheet_rec.worksheet_name    := ‘Salaries’;
v_worksheet_rec.col_count         := 3;
v_worksheet_rec.col_width_list    := ’25,20,15′;
v_worksheet_rec.col_header_list   := ‘Lastname,Firstname,Salary’;
v_worksheet_rec.col_datatype_list := ‘String,String,Number’;
v_worksheet_rec.col_style_list    := ‘LastnameStyle,FirstnameStyle,NumberStyle’;

ExcelDocTypeUtils.addWorksheetType(v_worksheet_array,v_worksheet_rec);

v_worksheet_rec := NULL;

– Contact
v_worksheet_rec.query           := v_sql_contact;
v_worksheet_rec.worksheet_name  := ‘Contact_Info’;
v_worksheet_rec.col_count       := 4;
v_worksheet_rec.col_width_list  := ’25,25,25,25′;
v_worksheet_rec.col_header_list := ‘Lastname,Firstname,Phone,Email’;
v_worksheet_rec.col_style_list    := ‘LastnameStyle,FirstnameStyle,,’;

ExcelDocTypeUtils.addWorksheetType(v_worksheet_array,v_worksheet_rec);
v_worksheet_rec := NULL;

– Hiredate
v_worksheet_rec.query           := v_sql_hiredate;
v_worksheet_rec.worksheet_name  := ‘Hiredate’;
v_worksheet_rec.col_count       := 3;
v_worksheet_rec.col_width_list  := ’25,20,20′;
v_worksheet_rec.col_header_list := ‘Lastname,Firstname,Hiredate’;
v_worksheet_rec.col_style_list    := ‘LastnameStyle,FirstnameStyle,,’;

ExcelDocTypeUtils.addWorksheetType(v_worksheet_array,v_worksheet_rec);

excelReport := ExcelDocTypeUtils.createExcelDocument(v_worksheet_array,v_style_array);

excelReport.displayDocument;

END;
/

 

Here is a link to the spreadsheet generated by the code (The file is an XML file with a .xls extension):
employeeReport.xls

Here is a screen shot of the resulting spreadsheet:

 

from: http://www.jasonsdevelopercorner.com/?page_id=8