使用SchemaCrawler和MySQL5.7時，無法檢索索引的註釋

Question

我可以使用SchemaCrawler和MySQL5.7檢索表和列的註釋，但是失敗了索引的註釋。這是一個例子：

1）表定義

create table testtable(
    id bigint unsigned auto_increment, 
    city_id varchar(256), 
    person_id varchar(256), 
    primary key(id) comment 'This is comment for the primary key', 
    key idx1 (city_id, person_id) comment 'This is the comment for test index' 
) comment='This is the comment for test table'; 

2）Java代碼

// jdbc:mysql://localhost:3306/testdb?useInformationSchema=true&useUnicode=true&characterEncoding=utf8 
final Connection connection = ...; 
final DatabaseSpecificOverrideOptions databaseSpecificOverrideOptions = 
         SchemaCrawlerUtility.matchDatabaseSpecificOverrideOptions(connection); 

final SchemaCrawler schemaCrawler = new SchemaCrawler(connection, databaseSpecificOverrideOptions); 

final SchemaCrawlerOptions options = new SchemaCrawlerOptions(); 
options.setSchemaInfoLevel(SchemaInfoLevelBuilder.maximum()); 
options.setTableInclusionRule(new IncludeAll()); 
options.setColumnInclusionRule(new IncludeAll()); 

final Catalog catalog = schemaCrawler.crawl(options); 
final Collection<schemacrawler.schema.Table> tables = catalog.getTables(); 

for (schemacrawler.schema.Table t : tables) { 
    System.out.println(t.getPrimaryKey().getRemarks()); 
    for (schemacrawler.schema.Index index : t.getIndexes()) { 
     System.out.println(index.getRemarks()); 
    } 
} 

有什麼，我應該調整？

謝謝！

Answer 1

對不起，SchemaCrawler 14.16.01中MySQL不支持索引註釋。請確保在類路徑中包含us.fatehi:schemacrawler-mysql jar file。

Sualeh Fatehi SchemaCrawler