Primary Keys

You can use the getPrimaryKeys method to return information about the primary keys for HarperDB tables. You can restrict the results by the table name.

The following code example outputs the column or columns composing the primary key for the [HarperDB].[cstest].Cutomers table:

String connectionString = "jdbc:harperdb:Server=127.0.0.1;User=admin;Password=1234;Port=9925;";

Connection conn = DriverManager.getConnection(connectionString);
ResultSet rs = conn.getMetaData().getPrimaryKeys("HarperDB","cstest","Cutomers");
while(rs.next()){
  System.out.println(rs.getString("COLUMN_NAME"));
}

The getPrimaryKeys method returns the following columns:


Column Name	Data Type	Description
TABLE_CAT	String	The table catalog
TABLE_SCHEM	String	The table schema.
TABLE_NAME	String	The table name.
COLUMN_NAME	String	The column name.
KEY_SEQ	short	The sequence number, or column index starting from 1, within the foreign key.
PK_NAME	String	The primary key name.

JDBC Driver for HarperDB

Primary Keys