Difference between revisions of "TGTable"
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(Created page with "TGTable is not used to store or retrieve data. This component is only used to store table metadata : description, fields, index, constraints.") |
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This component is only used to store table metadata : description, fields, index, constraints. | This component is only used to store table metadata : description, fields, index, constraints. | ||
| + | |||
| + | == To create a new table == | ||
| + | |||
| + | This is for a new functionnality in the application (only in the trunk version). | ||
| + | |||
| + | * Create the table and all it's index and constraints with MySql Query Browser or any other MySql client (not PostgreSQL). | ||
| + | **The following types can be used only. If other types are necessary, some development must be done. | ||
| + | *** Integer Autoinc | ||
| + | *** Integer, smallint | ||
| + | *** Varchar | ||
| + | *** Timestamp | ||
| + | *** Date, Datetime | ||
| + | *** Blob | ||
| + | **Always start with an '''Id''' field, Autoinc and Primary key | ||
| + | **Always end with an '''UpdateDate''' field, ''TimeStamp default current_timestamp on update current_timestamp'' | ||
| + | * Create a TGTable object in Datamodule, with connexion set to open the previous database. | ||
| + | ** Create a new computed field AutoInc, correct it's Name (bug), set it Required and set the field to fkData. | ||
| + | ** Add '''all''' other fields. | ||
| + | ** Write the index and constraint instructions in the property ''Properties'' of the TGTable. | ||
| + | ** In DataModule1.DbAfterConnect event, add to TGTable.Check. | ||
| + | * Test it and check the structure and data created in the query browser ! | ||
Revision as of 22:05, 17 October 2012
TGTable is not used to store or retrieve data.
This component is only used to store table metadata : description, fields, index, constraints.
To create a new table
This is for a new functionnality in the application (only in the trunk version).
- Create the table and all it's index and constraints with MySql Query Browser or any other MySql client (not PostgreSQL).
- The following types can be used only. If other types are necessary, some development must be done.
- Integer Autoinc
- Integer, smallint
- Varchar
- Timestamp
- Date, Datetime
- Blob
- Always start with an Id field, Autoinc and Primary key
- Always end with an UpdateDate field, TimeStamp default current_timestamp on update current_timestamp
- The following types can be used only. If other types are necessary, some development must be done.
- Create a TGTable object in Datamodule, with connexion set to open the previous database.
- Create a new computed field AutoInc, correct it's Name (bug), set it Required and set the field to fkData.
- Add all other fields.
- Write the index and constraint instructions in the property Properties of the TGTable.
- In DataModule1.DbAfterConnect event, add to TGTable.Check.
- Test it and check the structure and data created in the query browser !