10.3 Loading a Graph by Defining a Graph Configuration Object
You can load a graph from Oracle Database by first defining the graph configuration
object using the GraphConfigBuilder class and then reading the graph into
the graph server (PGX).
The following example loads a PGQL property graph into memory, authenticating as <database user>/<database password> with the database:
opg4j> var vertexConfig = new RdbmsEntityProviderConfigBuilder().
...> setName("Account").
...> setKeyColumn("ID").
...> setParallelHintDegree(3).
...> setDatabaseTableName("BANK_ACCOUNTS").
...> addProperty("ID", PropertyType.INTEGER).
...> build()
opg4j> var edgeConfig = new RdbmsEntityProviderConfigBuilder().
...> setName("Transfer").
...> setKeyColumn("TXN_ID").
...> setSourceColumn("FROM_ACCT_ID").
...> setDestinationColumn("TO_ACCT_ID").
...> setSourceVertexProvider("Account").
...> setDestinationVertexProvider("Account").
...> setParallelHintDegree(3).
...> createKeyMapping(true).
...> setDatabaseTableName("BANK_TXNS").
...> addProperty("FROM_ACCT_ID", PropertyType.INTEGER).
...> addProperty("TO_ACCT_ID", PropertyType.INTEGER).
...> addProperty("AMOUNT", PropertyType.FLOAT).
...> build()
opg4j> var cfg = GraphConfigBuilder.forPartitioned().
...> setJdbcUrl("jdbc:oracle:thin:@localhost:1521/orclpdb").
...> setUsername("graphuser").
...> setPassword("<password>").
...> setName("bank_graph").
...> setSourceName("bank_graph").
...> setSourceType(SourceType.PG_VIEW).
...> setVertexIdType(IdType.INTEGER).
...> addVertexProvider(vertexConfig).
...> addEdgeProvider(edgeConfig).
...> build()
opg4j> var g = session.readGraphWithProperties(cfg)
g ==> PgxGraph[name=bank_graph,N=999,E=4993,created=1676806306348]// Build the vertex provider
RdbmsEntityProviderConfig vertexConfig = new RdbmsEntityProviderConfigBuilder()
.setName("Account")
.setKeyColumn("ID")
.setParallelHintDegree(3)
.setDatabaseTableName("BANK_ACCOUNTS")
.addProperty("ID", PropertyType.INTEGER)
.build();
// Build the edge provider
RdbmsEntityProviderConfig edgeConfig = new RdbmsEntityProviderConfigBuilder()
.setName("Transfer")
.setKeyColumn("TXN_ID")
.setSourceColumn("FROM_ACCT_ID")
.setDestinationColumn("TO_ACCT_ID")
.setSourceVertexProvider("Account")
.setDestinationVertexProvider("Account")
.setParallelHintDegree(3)
.createKeyMapping(true)
.setDatabaseTableName("BANK_TXNS")
.addProperty("FROM_ACCT_ID", PropertyType.INTEGER)
.addProperty("TO_ACCT_ID", PropertyType.INTEGER)
.addProperty("AMOUNT", PropertyType.FLOAT)
.build();
// Build the graph
GraphConfig cfg = GraphConfigBuilder.forPartitioned()
.setJdbcUrl("jdbc:oracle:thin:@localhost:1521/orclpdb")
.setUsername("graphuser")
.setPassword("<password>")
.setName("bank_graph")
.setSourceName("bank_graph")
.setSourceType(SourceType.PG_VIEW)
.setVertexIdType(IdType.INTEGER)
.addVertexProvider(vertexConfig)
.addEdgeProvider(edgeConfig)
.build();
PgxGraph g = session.readGraphWithProperties(cfg);