MetadataAccessor (flink-cdc-parent 3.8-SNAPSHOT API)

All Known Implementing Classes:

FlussMetadataAccessor, MySqlMetadataAccessor, OracleMetadataAccessor, PostgresMetadataAccessor, SqlServerMetadataAccessor, ValuesDatabase.ValuesMetadataAccessor
```
@PublicEvolving
public interface MetadataAccessor
```
MetadataAccessor is used by DataSource to access the metadata from external systems.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Schema`	`getTableSchema(TableId tableId)`	Get the `Schema` of the given table.
`List<String>`	`listNamespaces()`	List all namespaces from external systems.
`List<String>`	`listSchemas(String namespace)`	List all schemas from external systems.
`List<TableId>`	`listTables(String namespace, String schemaName)`	List tables by namespace and schema from external systems.

- Method Detail
  - listNamespaces
```
List<String> listNamespaces()
```
    List all namespaces from external systems.
    
    Returns:
    
    The list of namespaces
    
    Throws:
    
    UnsupportedOperationException - Thrown, if the external system does not support namespace.
  - listSchemas
```
List<String> listSchemas(@Nullable
                         String namespace)
```
    List all schemas from external systems.
    
    Parameters:
    
    namespace - The namespace to list schemas from. If null, list schemas from all namespaces.
    
    Returns:
    
    The list of schemas
    
    Throws:
    
    UnsupportedOperationException - Thrown, if the external system does not support schema.
  - listTables
```
List<TableId> listTables(@Nullable
                         String namespace,
                         @Nullable
                         String schemaName)
```
    List tables by namespace and schema from external systems.
    
    Parameters:
    
    namespace - The namespace to list tables from. If null, list tables from all namespaces.
    
    schemaName - The schema to list tables from. If null, list tables from all schemas.
    
    Returns:
    
    The list of TableIds.
  - getTableSchema
```
Schema getTableSchema(TableId tableId)
```
    Get the Schema of the given table.
    
    Parameters:
    
    tableId - The TableId of the given table.
    
    Returns:
    
    The Schema of the table.