Question

我在oracle 11g中有一个名为testUser的用户。现在我在用户testUser下有4个表。我想仅为用户testUser下存在的所有表获取元数据。我正在使用接口java.sql.DatabaseMetaData中提供的getTables方法。方法的签名如下：

getTables(java.lang.String catalog,
java.lang.String schemaPattern,
java.lang.String tableNamePattern,
java.lang.String[] types);

任何人都可以帮助我理解应该在getTables方法的第一个和第二个参数中传递的值。我认为在第三个参数tableNamePattern中，我必须传递＆＃34;％＆＃34;在第四个参数中，我将仅使用一个元素传递字符串数组＆＃34; TABLE＆＃34;因为我必须取桌子。

我不确定第一个和第二个参数值。如果我在第一个和第二个参数中传递null，它会尝试获取oracle中存在的所有用户的所有表。但我想在单个用户下创建表格。

提前致谢。

Answer 1

根据oracle文档：的的getTables

ResultSet getTables(String catalog, String schemaPattern, String tableNamePattern, String[] types) throws SQLException Retrieves a description of the tables available in the given catalog. Only table descriptions matching the catalog, schema, table name and type criteria are returned. They are ordered by TABLE_TYPE, TABLE_CAT, TABLE_SCHEM and TABLE_NAME. Each table description has the following columns: TABLE_CAT String => table catalog (may be null) TABLE_SCHEM String => table schema (may be null) TABLE_NAME String => table name TABLE_TYPE String => table type. Typical types are "TABLE", "VIEW", "SYSTEM TABLE", "GLOBAL TEMPORARY", "LOCAL TEMPORARY", "ALIAS", "SYNONYM". REMARKS String => explanatory comment on the table TYPE_CAT String => the types catalog (may be null) TYPE_SCHEM String => the types schema (may be null) TYPE_NAME String => type name (may be null) SELF_REFERENCING_COL_NAME String => name of the designated "identifier" column of a typed table (may be null) REF_GENERATION String => specifies how values in SELF_REFERENCING_COL_NAME are created. Values are "SYSTEM", "USER", "DERIVED". (may be null) Note: Some databases may not return information for all tables. Parameters: catalog - a catalog name; must match the catalog name as it is stored in the database; "" retrieves those without a catalog; null means that the catalog name should not be used to narrow the search schemaPattern - a schema name pattern; must match the schema name as it is stored in the database; "" retrieves those without a schema; null means that the schema name should not be used to narrow the search tableNamePattern - a table name pattern; must match the table name as it is stored in the database types - a list of table types, which must be from the list of table types returned from getTableTypes(),to include; null returns all types Returns: ResultSet - each row is a table description

缩短

第一个参数catalog只是服务器实例

第二个参数schema只是数据库中的命名空间，与用户帐户相同

Answer 2

您可以为第一个参数传递null，并为第二个参数传递用户名（TESTUSER - 大写很重要）。目录对Oracle数据库无关紧要，schemaPattern（name）和用户名在Oracle数据库中是相同的。

如何获取在oracle 11g中为特定用户创建的所有表的元数据

2 个答案: