使用 DatabaseMetaData.getTables(null, “%”, “%”, new String[] {“TABLE”}); 在 MSSQL 的環境下會多出2個系統的 table.
trace_xe_action_map and trace_xe_event_map it’s some system table in system database.
From MS docs:
This table is stored in the master database, in the sys schema.
/* connecting to database using supplied credentials, and printing out the SQL queries for inserting data to local db */
public void connectToAzure(String connectionString, String databaseName, String username, String password) throws ClassNotFoundException, SQLException
{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
final Connection m_Connection = DriverManager.getConnection( connectionString+";DatabaseName="+databaseName, username, password );
final ArrayList<String> tables = getTableNames(m_Connection);
}
/* helper method to get table names */
public ArrayList<String> getTableNames(final Connection m_Connection)
{
final ArrayList<String> tables = new ArrayList<>();
try
{
DatabaseMetaData dbmd = m_Connection.getMetaData();
String[] types = {"TABLE"};
ResultSet rs = dbmd.getTables(null, null, "%", types);
while (rs.next())
{
String tableName = rs.getString("TABLE_NAME");
tables.add( tableName );
}
}
catch (SQLException e)
{
e.printStackTrace();
}
return tables;
}
Output on running the above
table1, table2, table3, table4, table5, table6, trace_xe_action_map, trace_xe_event_map
Of these,
trace_xe_action_map, trace_xe_event_map
are not tables that I have created.
Answer
You might want to run a simple select query on the database like this:
select TABLE_NAME from INFORMATION_SCHEMA.TABLES;
You can further filter out the table_names using where clauses like these:
SELECT
TABLE_NAME
FROM
INFORMATION_SCHEMA.TABLES
WHERE
TABLE_CATALOG = ? AND TABLE_SCHEMA = ?;