Difference between revisions of "PostgreSQL Adapter-nexj/schema-ddl"
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== Working with Database Structure - DDL == | == Working with Database Structure - DDL == | ||
=== CREATING SCHEMA === | === CREATING SCHEMA === | ||
− | * List of Files | + | * List of Files need to be modified * |
:src- [[ PostgreSQL_Adapter-nexj/SchemaManger | PostgreSQLSchemaManager.java ]] --- ([[SchemaBackup]]) // Extends SQLSchemaManager.java - class for reading, creating and upgrading the database schema | :src- [[ PostgreSQL_Adapter-nexj/SchemaManger | PostgreSQLSchemaManager.java ]] --- ([[SchemaBackup]]) // Extends SQLSchemaManager.java - class for reading, creating and upgrading the database schema | ||
: test- [[ PostgreSQL_Adapter-nexj/SchemaMangerTest | PostgreSQLSchemaManagerTest.java]] // Extends SQLSchemaManagerTest.java | : test- [[ PostgreSQL_Adapter-nexj/SchemaMangerTest | PostgreSQLSchemaManagerTest.java]] // Extends SQLSchemaManagerTest.java |
Revision as of 14:48, 15 December 2010
PostgreSQL Adapter for NexJ - Working Inside Schema 'test'
Working with Database Structure - DDL
CREATING SCHEMA
- List of Files need to be modified *
- src- PostgreSQLSchemaManager.java --- (SchemaBackup) // Extends SQLSchemaManager.java - class for reading, creating and upgrading the database schema
- test- PostgreSQLSchemaManagerTest.java // Extends SQLSchemaManagerTest.java
- Script - scripts are being processed through SQLDataTest.java
-
CREATE TABLE
- 1- DATA TYPE: data types are changed in
appendColumnType()
based on each jdbc type's equivalent in PostgreSQL. - 2- STORAGE ENGINE: In MySQL, the storage engine is set to a transactional safe engine such as InnoDB, whereas PostgreSQL has a single built in engine. So, implementation of
appendTableSuffix()
in PostgreSQLManager.java was removed - 3- CHARACTER SET: In MySQL, the character set should be defined when creating a table. Whereas in PostgreSQL when a database is created, the character set is set to 'UTF8' by default.
- 4- AUTO INCREMENT: PostgreSQL doesn't support 'auto_increment' as some other databases for a unique identifier column. There are two ways around this, 1- To create a 'sequence', 2- Use SERIAL, which is a macro around 'sequence'. SERIAL is an 'integer' and a 'sequence, with the column default to the sequences next value. As of postgreSQL 7.3, to make a serial column unique, it should be specified as a unique constraint or a primary key. More info @ PostgreSQL Resources
/* MySQL version of creating table script */
create table test.RangeTest(
id int auto_increment not null, s varchar(1) character set utf8 null, bin varbinary(1) null,
n int null, n1 tinyint unsigned null, l bigint null, "DEC" decimal(10,5) null,
f float null, d double null, tm datetime null, b boolean null,
constraint RangeTest_PK primary key(id)
)engine=InnoDB character set = utf8
/* PostgreSQL version of creating table script */
CREATE TABLE test.RangeTest(
id serial not null, s text null, bin bytea null,
n integer null, n1 smallint null, l bigint null, "DEC" decimal(10,5) null,
f double precision null, d double precision null, tm timestamp null, b boolean null,
constraint RangeTest_PK primary key(id)
);
// Using SERIAL is another way to work around 'sequence'
//CREATE SEQUENCE test.RangeTest_id_seq;
//ALTER TABLE test.RangeTest ALTER COLUMN id SET DEFAULT NEXTVAL('test.RangeTest_id_seq');
CREATE TEXT TABLE
- The implementation in
crateTextTable()
is removed for now (base class's version is being called). - TODO To be checked if it's the case for PostgreSQL as well.
-
CREATE INDEX
- The implementation in
createIndex()
is removed for now (base class's version is being called). - TODO To be checked if it's the case for PostgreSQL as well.
- Note- If there was a complain for duplicate index name, a fully qualified name can be used. Just note that PostgreSQL doesn't like fully qualified name as
table.indexname
for indexes or triggers, instead a '_' can be used:table_indexname
-
CREATE Trigger
- TODO To be checked if triggers are needed for PostgreSQL as well. It's not an abstract method in SQLSchemaManager.java.
-
createTrigger()
is added to MySQLSchemaManager.java
UPDGRADING SCHEMA
- List of Files needed to be modified
- src - PostgreSQLSchemaManager.java --- (SchemaBackup) // Extends SQLSchemaManager.java - class for reading, creating and upgrading the database schema
- main.upgrade
- test- PostgreSQLSchemaManagerTest.java // Extends SQLSchemaManagerTest.java
- Script - postgresql_drop.sql
-
DROP TABLE
-
INSERT INTO TABLE
-
ALTER TABLE