bbdf008125
- Introduced CT_MRDS.DATA_EXPORTER package to facilitate data exports in CSV and Parquet formats. - Implemented support for cloud storage integration via Oracle Cloud Infrastructure (OCI). - Added versioning and detailed version history for tracking changes and improvements. - Included main export procedures: EXPORT_TABLE_DATA, EXPORT_TABLE_DATA_BY_DATE, and EXPORT_TABLE_DATA_TO_CSV_BY_DATE. - Enhanced parallel processing capabilities for improved performance during data exports.
221 lines
12 KiB
Plaintext
221 lines
12 KiB
Plaintext
create or replace PACKAGE CT_MRDS.DATA_EXPORTER
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AUTHID CURRENT_USER
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AS
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/**
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* Data Export Package: Provides comprehensive data export capabilities to various formats (CSV, Parquet)
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* with support for cloud storage integration via Oracle Cloud Infrastructure (OCI).
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* The structure of comment is used by GET_PACKAGE_DOCUMENTATION function
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* which returns documentation text for confluence page (to Copy-Paste it).
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**/
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-- Package Version Information
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PACKAGE_VERSION CONSTANT VARCHAR2(10) := '2.17.0';
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PACKAGE_BUILD_DATE CONSTANT VARCHAR2(19) := '2026-03-11 10:00:00';
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PACKAGE_AUTHOR CONSTANT VARCHAR2(50) := 'MRDS Development Team';
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-- Version History (last 3-5 changes)
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VERSION_HISTORY CONSTANT VARCHAR2(4000) :=
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'v2.17.0 (2026-03-11): PARQUET FIX - Added pFormat parameter to buildQueryWithDateFormats. REPLACE(col,CHR(34)) now applied only when pFormat=CSV. EXPORT_TABLE_DATA_BY_DATE passes PARQUET - string data was being corrupted (single " doubled to ""). Parquet is binary and needs no quote escaping.' || CHR(10) ||
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'v2.16.0 (2026-03-11): RFC 4180 FIX - Added REPLACE(col,CHR(34),CHR(34)||CHR(34)) in buildQueryWithDateFormats for VARCHAR2/CHAR/CLOB. Pre-doubled values produce compliant CSV for ORACLE_LOADER OPTIONALLY ENCLOSED BY chr(34).' || CHR(10) ||
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'v2.6.3 (2026-01-28): COMPILATION FIX - Resolved ORA-00904 error in EXPORT_PARTITION_PARALLEL. SQLERRM and DBMS_UTILITY.FORMAT_ERROR_BACKTRACE cannot be used directly in SQL UPDATE statements. Now properly assigned to vgMsgTmp variable before UPDATE.' || CHR(10) ||
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'v2.6.2 (2026-01-28): CRITICAL FIX - Race condition when multiple exports run simultaneously. Changed DELETE to filter by age (>24h) instead of deleting all COMPLETED chunks. Prevents concurrent sessions from deleting each other chunks. Session-safe cleanup with TASK_NAME filtering. Enables true parallel execution of multiple export jobs.' || CHR(10) ||
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'v2.6.1 (2026-01-28): Added DELETE_FAILED_EXPORT_FILE procedure to clean up partial/corrupted files before retry. When partition fails mid-export, partial file is deleted before retry to prevent Oracle from creating _1 suffixed duplicates. Ensures clean retry without orphaned files in OCI bucket.' || CHR(10) ||
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'v2.6.0 (2026-01-28): CRITICAL FIX - Added STATUS tracking to A_PARALLEL_EXPORT_CHUNKS table to prevent data duplication on retry. System now restarts ONLY failed partitions instead of re-exporting all data. Added ERROR_MESSAGE and EXPORT_TIMESTAMP columns for better error handling and monitoring. Prevents duplicate file creation when parallel tasks fail (e.g., 22 partitions with 16 threads, 3 failures no longer duplicates 19 successful exports).' || CHR(10) ||
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'v2.5.0 (2026-01-26): Added recorddelimiter parameter with CRLF (CHR(13)||CHR(10)) for CSV exports to ensure Windows-compatible line endings. Improves cross-platform compatibility when CSV files are opened in Windows applications (Notepad, Excel).' || CHR(10) ||
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'v2.4.0 (2026-01-11): Added pTemplateTableName parameter for per-column date format configuration. Implements dynamic query building with TO_CHAR for each date/timestamp column using FILE_MANAGER.GET_DATE_FORMAT. Supports 3-tier hierarchy: column-specific, template DEFAULT, global fallback. Eliminates single dateformat limitation of DBMS_CLOUD.EXPORT_DATA.' || CHR(10) ||
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'v2.3.0 (2025-12-20): Added parallel partition processing using DBMS_PARALLEL_EXECUTE. New pParallelDegree parameter (1-16, default 1) for EXPORT_TABLE_DATA_BY_DATE and EXPORT_TABLE_DATA_TO_CSV_BY_DATE procedures. Each year/month partition processed in separate thread for improved performance.' || CHR(10) ||
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'v2.2.0 (2025-12-19): DRY refactoring - extracted shared helper functions (sanitizeFilename, VALIDATE_TABLE_AND_COLUMNS, GET_PARTITIONS, EXPORT_SINGLE_PARTITION worker procedure). Reduced code duplication by ~400 lines. Prepared architecture for v2.3.0 parallel processing.' || CHR(10) ||
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'v2.1.1 (2025-12-04): Fixed JOIN column reference A_WORKFLOW_HISTORY_KEY -> A_ETL_LOAD_SET_KEY, added consistent column mapping and dynamic column list to EXPORT_TABLE_DATA procedure, enhanced DEBUG logging for all export operations' || CHR(10) ||
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'v2.1.0 (2025-10-22): Added version tracking and PARTITION_YEAR/PARTITION_MONTH support' || CHR(10) ||
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'v2.0.0 (2025-10-01): Separated export functionality from FILE_MANAGER package' || CHR(10);
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cgBL CONSTANT VARCHAR2(2) := CHR(13)||CHR(10);
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vgMsgTmp VARCHAR2(32000);
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---------------------------------------------------------------------------------------------------------------------------
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-- TYPE DEFINITIONS FOR PARTITION HANDLING
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---------------------------------------------------------------------------------------------------------------------------
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/**
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* Record type for year/month partition information
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**/
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TYPE partition_rec IS RECORD (
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year VARCHAR2(4),
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month VARCHAR2(2)
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);
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/**
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* Table type for collection of partition records
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**/
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TYPE partition_tab IS TABLE OF partition_rec;
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---------------------------------------------------------------------------------------------------------------------------
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-- INTERNAL PARALLEL PROCESSING CALLBACK
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---------------------------------------------------------------------------------------------------------------------------
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/**
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* @name EXPORT_PARTITION_PARALLEL
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* @desc Internal callback procedure for DBMS_PARALLEL_EXECUTE.
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* Processes single partition (year/month) chunk in parallel task.
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* Called by DBMS_PARALLEL_EXECUTE framework for each chunk.
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* This procedure is PUBLIC because DBMS_PARALLEL_EXECUTE requires it,
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* but should NOT be called directly by external code.
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* @param pStartId - Chunk start ID (CHUNK_ID from A_PARALLEL_EXPORT_CHUNKS table)
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* @param pEndId - Chunk end ID (same as pStartId for single-row chunks)
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**/
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PROCEDURE EXPORT_PARTITION_PARALLEL (
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pStartId IN NUMBER,
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pEndId IN NUMBER
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);
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---------------------------------------------------------------------------------------------------------------------------
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-- MAIN EXPORT PROCEDURES
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---------------------------------------------------------------------------------------------------------------------------
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/**
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* @name EXPORT_TABLE_DATA
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* @desc Wrapper procedure for DBMS_CLOUD.EXPORT_DATA.
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* Exports data into CSV file on OCI infrustructure.
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* pBucketArea parameter accepts: 'INBOX', 'ODS', 'DATA', 'ARCHIVE'
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* @example
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* begin
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* DATA_EXPORTER.EXPORT_TABLE_DATA(
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* pSchemaName => 'CT_MRDS',
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* pTableName => 'MY_TABLE',
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* pKeyColumnName => 'A_ETL_LOAD_SET_KEY_FK',
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* pBucketArea => 'DATA',
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* pFolderName => 'csv_exports'
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* );
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* end;
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**/
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PROCEDURE EXPORT_TABLE_DATA (
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pSchemaName IN VARCHAR2,
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pTableName IN VARCHAR2,
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pKeyColumnName IN VARCHAR2,
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pBucketArea IN VARCHAR2,
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pFolderName IN VARCHAR2,
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pCredentialName IN VARCHAR2 default ENV_MANAGER.gvCredentialName
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);
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/**
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* @name EXPORT_TABLE_DATA_BY_DATE
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* @desc Wrapper procedure for DBMS_CLOUD.EXPORT_DATA.
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* Exports data into PARQUET files on OCI infrustructure.
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* Each YEAR_MONTH pair goes to seperate file (implicit partitioning).
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* Allows specifying custom column list or uses T.* if pColumnList is NULL.
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* Validates that all columns in pColumnList exist in the target table.
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* Automatically adds 'T.' prefix to column names in pColumnList.
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* Supports parallel partition processing via pParallelDegree parameter (default 1, range 1-16).
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* pBucketArea parameter accepts: 'INBOX', 'ODS', 'DATA', 'ARCHIVE'
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* @example
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* begin
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* DATA_EXPORTER.EXPORT_TABLE_DATA_BY_DATE(
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* pSchemaName => 'CT_MRDS',
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* pTableName => 'MY_TABLE',
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* pKeyColumnName => 'A_ETL_LOAD_SET_KEY_FK',
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* pBucketArea => 'DATA',
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* pFolderName => 'parquet_exports',
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* pColumnList => 'COLUMN1, COLUMN2, COLUMN3', -- Optional
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* pMinDate => DATE '2024-01-01',
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* pMaxDate => SYSDATE,
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* pParallelDegree => 8 -- Optional, default 1, range 1-16
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* );
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* end;
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**/
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PROCEDURE EXPORT_TABLE_DATA_BY_DATE (
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pSchemaName IN VARCHAR2,
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pTableName IN VARCHAR2,
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pKeyColumnName IN VARCHAR2,
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pBucketArea IN VARCHAR2,
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pFolderName IN VARCHAR2,
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pColumnList IN VARCHAR2 default NULL,
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pMinDate IN DATE default DATE '1900-01-01',
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pMaxDate IN DATE default SYSDATE,
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pParallelDegree IN NUMBER default 1,
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pTemplateTableName IN VARCHAR2 default NULL,
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pCredentialName IN VARCHAR2 default ENV_MANAGER.gvCredentialName
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);
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/**
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* @name EXPORT_TABLE_DATA_TO_CSV_BY_DATE
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* @desc Exports data to separate CSV files partitioned by year and month.
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* Creates one CSV file for each year/month combination found in the data.
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* Uses the same date filtering mechanism with CT_ODS.A_LOAD_HISTORY as EXPORT_TABLE_DATA_BY_DATE,
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* but exports to CSV format instead of Parquet.
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* Supports parallel partition processing via pParallelDegree parameter (1-16).
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* File naming pattern: {pFileName}_YYYYMM.csv or {TABLENAME}_YYYYMM.csv (if pFileName is NULL)
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* @example
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* begin
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* -- With custom filename
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* DATA_EXPORTER.EXPORT_TABLE_DATA_TO_CSV_BY_DATE(
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* pSchemaName => 'CT_MRDS',
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* pTableName => 'MY_TABLE',
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* pKeyColumnName => 'A_ETL_LOAD_SET_KEY_FK',
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* pBucketArea => 'DATA',
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* pFolderName => 'exports',
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* pFileName => 'my_export.csv',
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* pMinDate => DATE '2024-01-01',
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* pMaxDate => SYSDATE,
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* pParallelDegree => 8 -- Optional, default 1, range 1-16
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* );
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*
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* -- With auto-generated filename (based on table name only)
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* DATA_EXPORTER.EXPORT_TABLE_DATA_TO_CSV_BY_DATE(
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* pSchemaName => 'OU_TOP',
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* pTableName => 'AGGREGATED_ALLOTMENT',
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* pKeyColumnName => 'A_ETL_LOAD_SET_KEY_FK',
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* pBucketArea => 'ARCHIVE',
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* pFolderName => 'exports',
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* pMinDate => DATE '2025-09-01',
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* pMaxDate => DATE '2025-09-17'
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* );
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* -- This will create files like: AGGREGATED_ALLOTMENT_202509.csv, etc.
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* pBucketArea parameter accepts: 'INBOX', 'ODS', 'DATA', 'ARCHIVE'
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* end;
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**/
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PROCEDURE EXPORT_TABLE_DATA_TO_CSV_BY_DATE (
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pSchemaName IN VARCHAR2,
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pTableName IN VARCHAR2,
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pKeyColumnName IN VARCHAR2,
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pBucketArea IN VARCHAR2,
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pFolderName IN VARCHAR2,
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pFileName IN VARCHAR2 DEFAULT NULL,
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pColumnList IN VARCHAR2 default NULL,
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pMinDate IN DATE default DATE '1900-01-01',
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pMaxDate IN DATE default SYSDATE,
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pParallelDegree IN NUMBER default 1,
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pTemplateTableName IN VARCHAR2 default NULL,
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pMaxFileSize IN NUMBER default 104857600,
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pCredentialName IN VARCHAR2 default ENV_MANAGER.gvCredentialName
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);
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---------------------------------------------------------------------------------------------------------------------------
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-- VERSION MANAGEMENT FUNCTIONS
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---------------------------------------------------------------------------------------------------------------------------
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/**
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* Returns the current package version number
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* return: Version string in format X.Y.Z (e.g., '2.1.0')
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**/
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FUNCTION GET_VERSION RETURN VARCHAR2;
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/**
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* Returns comprehensive build information including version, date, and author
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* return: Formatted string with complete build details
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**/
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FUNCTION GET_BUILD_INFO RETURN VARCHAR2;
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/**
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* Returns the version history with recent changes
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* return: Multi-line string with version history
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**/
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FUNCTION GET_VERSION_HISTORY RETURN VARCHAR2;
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END;
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/
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