strongduanmu opened a new issue, #16086:
URL: https://github.com/apache/shardingsphere/issues/16086
## Feature Request
To support handling of foreign key constraints in issue #16050,
ConstraintMetaData needs to be added to the metadata.
Add `Map<String, Constraint MetaData> constraints` to TableMetaData:
```java
/**
* Table meta data.
*/
@Getter
@EqualsAndHashCode
@ToString
public final class TableMetaData {
private final String name;
private final Map<String, ColumnMetaData> columns;
private final Map<String, IndexMetaData> indexes;
private final Map<String, ConstraintMetaData> constrains;
private final List<String> primaryKeyColumns = new ArrayList<>();
}
/**
* Constraint meta data.
*/
@RequiredArgsConstructor
@Getter
@EqualsAndHashCode
@ToString
public final class ConstraintMetaData {
private final String name;
private final String referencedTableName;
}
```
Then add query logic for constraints in MySQLTableMetaDataLoader.
```sql
SELECT CONSTRAINT_NAME, TABLE_NAME, COLUMN_NAME, REFERENCED_TABLE_NAME,
REFERENCED_COLUMN_NAME FROM information_schema.KEY_COLUMN_USAGE
WHERE TABLE_NAME IN ('bmsql_district_0') AND REFERENCED_TABLE_SCHEMA
IS NOT NULL;
```
- [x] Support MySQL constraint meta data load
- [x] Support Postgresql constraint meta data load
- [ ] Support openGauss constraint meta data load
- [ ] Support Oracle constraint meta data load
- [ ] Support SQLServer constraint meta data load
### Is your feature request related to a problem?
issue #16050
### Describe the feature you would like.
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