database-metadata

I am trying to retrieve different kind of metadata of my Oracle DB from Java code (using basic JDBC). For example, if I want to retrieve the list of tables with _FOO suffix, I can do something like: Connection connection = dataSource.getConnection(); DatabaseMetaData meta = connection.getMetaData(); ResultSet tables = meta.getTables(connection.getCatalog(), null, "%_FOO", new String[] { "TABLE" }); // Iterate on the ResultSet to get information on tables... Now, I want to retrieve all the sequences from my database (for example all sequence named S_xxx_FOO ). How would I do that, as I don't

I have inherited an existing Postgres database full of data. Most of the data has a 'created_date' column value. Some of the earlier data was inserted before this was being tracked. Is there a Postgres metadata table hidden away somewhere that tracks when INSERT queries were done? Postgres 9.5 or later You can enable track_commit_timestamp in postgresql.conf (and restart) to start tracking commit timestamps. Then you can get a timestamp for your xmin . Related answer: Atomically set SERIAL value when committing transaction Postgres 9.4 or older There is no such metadata in PostgreSQL unless

What is the difference between the ALL_TAB_COLUMNS and ALL_TAB_COLS system tables in Oracle 12c? In my DB, the ALL_TAB_COLUMNS has slightly fewer rows than ALL_TAB_COLS. From the Oracle manual for ALL_TAB_COLS This view differs from "ALL_TAB_COLUMNS" in that system-generated hidden columns and invisible columns, which are user-generated hidden columns, are not filtered out. From the Oracle manual for ALL_TAB_COLUMNS This view filters out system-generated hidden columns and invisible columns, which are user-generated hidden columns. The ALL_TAB_COLS view does not filter out hidden columns and

I'd like to retrieve all trigger names from an Oracle database schema. I use getFunctions to retrieve all functions but i can't find another one for the triggers. DatabaseMetaData dbmd; ResultSet result = dbmd.getFunctions(null, Ousername, null); You can do it using metadata. DatabaseMetaData dbmd = dbConnection.getMetaData(); ResultSet result = dbmd.getTables("%", Ousername, "%", new String[]{ "TRIGGER" }); while (result.next()) { result.getString("TABLE_NAME") } The JDBC API does not provide a standard way to retrieve trigger information from the DatabaseMetaData. In fact, the word "trigger"

I have a ResultSet that returns data of different types. The query is constructed dynamically so, at compile time, I don't know what type of value the query will return. I have written the following code assuming that all results are Strings. But I want to get the type of each value too. How can I do this? Below is the code I have written. while (reportTable_rst.next()) { String column = reportTable_rst.getString(columnIterator); } At this point, I would like to get the column type, and get the value according to the data type. The ResultSetMetaData.getColumnType(int column) returns a int

I'm busy on a piece of code to get alle the column names of a table from an Oracle database. The code I came up with looks like this: DriverManager.registerDriver (new oracle.jdbc.driver.OracleDriver()); Connection conn = DriverManager.getConnection( "jdbc:oracle:thin:@<server>:1521:<sid>", <username>, <password>); DatabaseMetaData meta = conn.getMetaData(); ResultSet columns = meta.getColumns(null, null, "EMPLOYEES", null); int i = 1; while (columns.next()) { System.out.printf("%d: %s (%d)\n", i++, columns.getString("COLUMN_NAME"), columns.getInt("ORDINAL_POSITION")); } When I ran this code

In Oracle, is there a way to find out when a particular table was created? Similarly, is there a way to find out when a particular row was inserted/last updated? SELECT created FROM dba_objects WHERE object_name = <<your table name>> AND owner = <<owner of the table>> AND object_type = 'TABLE' will tell you when a table was created (if you don't have access to DBA_OBJECTS, you could use ALL_OBJECTS instead assuming you have SELECT privileges on the table). The general answer to getting timestamps from a row, though, is that you can only get that data if you have added columns to track that