PostgreSQL Adapter Project - Extending SQLSchemaManager

PostgreSQL Adapter for NexJ - Extending SQL Schema Manager

• SQLSchemaManager is used in maintaining database schemas (DDL)

Task Summary

Task	Status	Test Status
Extend SQLSchemaManager to support PostgreSQL	DONE	DONE
Research and add Maximum column Precision	DONE
Figure out Data Type Mapping	DONE
Implement appendColumnType() method	DONE
Implement appendConcatenate() method	DONE
Implement appendPrint() method	DONE
Implement appendUpgradeStepEnd() method
Implement appendUpgradeStepStart() method
Implement appendTSExtract() method	DONE
Add appendTSField method *NOTE: It is used in appendTSExtract() method, and it is quite similar to the one in MySQL. (Suggest to NexJ to add it to the super class)	DONE
Implement appendTSIncrement() method
Implement getCreateEtcScriptName() method	DONE
Implement getDefaultIndexspace() method	DONE
Implement getDefaultLongspace() method	DONE	DONE
Implement getDefaultTablespace() method	DONE
Implement getDropEtcScriptName() method
Implement getDynamicSQLAppender() method
Implement getGUIDExpr() method
Implement getNowExpr() method	DONE
Implement getSeparator() method	DONE
Implement getSetupEtcScriptName() method	DONE
Override renameTable[1]
Override renameColumn[2]
Override renameIndex[3]
Override getIndexName()	DONE
Override appendColumnSuffix

Task Details

Extend SQLSchemaManager to support PostgreSQL

Create a new class PostgreSQLSchemaManager by extending SQLSchemaManager and implementing all necessary abstract classes

Research and add Maximum column Precision

Following are the Maximum column precisions we might need to establish:
(All constants are defined in PostgreSQLAdapter class)

• DEFAULT_FETCH_SIZE
• MAX_CHAR_PRECISION
• MAX_VARCHAR_PRECISION
• MAX_BINARY_PRECISION
• MAX_VARBINARY_PRECISION
• MAX_REAL_PRECISION
• TIMESTAMP_FORMAT_SQL
• TIMESTAMP_FORMAT

Figure out Data Type Mapping

http://www.postgresql.org/docs/current/static/datatype.html

• Go over all data types offered in PostgreSQL
• Map types defined in Primitive class

Implement appendColumnType() method

This method appends a table column type declaration to a string buffer.

• use logic and mapping to append required column data types to incoming string.
• Test it

Implement appendTSExtract() method

This method extracts a field from a timestamp. It uses SQLSubstReaser's enums.

• Researc the extract function in the PostgreSQL
• Implement it in Adapter
• Test it

• NOTE: The logic to implement the extract function is similar to the one in MySQL Adapter. It could be a good idea to suggest to NexJ to add the appendTSField method to the super class, so we are not repeating the code. (Can be done in the Optimization stage)

References

SQL Commands supported by PostgreSQL