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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| package org.neo4j.dataimport; | ||
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| import org.neo4j.graphdb.DynamicRelationshipType; | ||
| import org.neo4j.kernel.impl.batchinsert.BatchInserter; | ||
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| import java.sql.Connection; | ||
| import java.sql.ResultSet; | ||
| import java.sql.ResultSetMetaData; | ||
| import java.sql.SQLException; | ||
| import java.sql.Statement; | ||
| import java.util.Arrays; | ||
| import java.util.HashMap; | ||
| import java.util.HashSet; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
|
|
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| public class JdbcImporter implements BatchInserterImporter | ||
| { | ||
| private Connection connection; | ||
| private String nodesTable; | ||
| private String relsTable; | ||
| private Set<String> reservedRelColumns = new HashSet<String>( Arrays.asList( "src", "dest", "type" ) ); | ||
| private Set<String> reservedNodeColumns = new HashSet<String>( Arrays.asList( "id" ) ); | ||
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| public JdbcImporter( Connection connection, String nodes, String rels ) | ||
| { | ||
| this.connection = connection; | ||
| nodesTable = nodes; | ||
| relsTable = rels; | ||
| } | ||
|
|
||
| @Override | ||
| public void importTo( BatchInserter target ) | ||
| { | ||
| try | ||
| { | ||
| doImport( target ); | ||
| } | ||
| catch ( SQLException e ) | ||
| { | ||
| throw new DataImportException( e ); | ||
| } | ||
| } | ||
|
|
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| private void doImport( BatchInserter target ) throws SQLException | ||
| { | ||
| importNodes( target ); | ||
| importRels( target ); | ||
| } | ||
|
|
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| private void importNodes( BatchInserter target ) throws SQLException | ||
| { | ||
| Statement statement = connection.createStatement(); | ||
| ResultSet resultSet = statement.executeQuery( "SELECT * FROM " + nodesTable ); | ||
| Map<String, String> columnTypes = getPropertyColumns( resultSet, reservedNodeColumns ); | ||
| while ( resultSet.next() ) | ||
| { | ||
| target.createNode( resultSet.getLong( "id" ), getProperties( columnTypes, resultSet ) ); | ||
| } | ||
| statement.close(); | ||
| } | ||
|
|
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| private void importRels( BatchInserter target ) throws SQLException | ||
| { | ||
| Statement statement = connection.createStatement(); | ||
| ResultSet resultSet = statement.executeQuery( "SELECT * FROM " + relsTable ); | ||
| Map<String, String> columnTypes = getPropertyColumns( resultSet, reservedRelColumns ); | ||
| while ( resultSet.next() ) | ||
| { | ||
| target.createRelationship( resultSet.getLong( "src" ), resultSet.getLong( "dest" ), DynamicRelationshipType.withName( resultSet.getString( "type" ) ), getProperties( columnTypes, resultSet ) ); | ||
| } | ||
| statement.close(); | ||
| } | ||
|
|
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| private Map<String, String> getPropertyColumns( ResultSet resultSet, Set<String> reserved ) throws SQLException | ||
| { | ||
| Map<String, String> columnTypes = new HashMap<String, String>(); | ||
| ResultSetMetaData metaData = resultSet.getMetaData(); | ||
| long columnCount = metaData.getColumnCount(); | ||
| System.out.println( String.format( "Found %d columns", columnCount ) ); | ||
| for ( int i = 1; i <= columnCount; i++ ) | ||
| { | ||
| String columnName = metaData.getColumnName( i ); | ||
| String columnType = metaData.getColumnTypeName( i ); | ||
| System.out.println( String.format( "Found column %s (%s)", columnName, columnType ) ); | ||
| if ( !reserved.contains( columnName ) ) | ||
| { | ||
| columnTypes.put( columnName, columnType ); | ||
| } | ||
| } | ||
| return columnTypes; | ||
| } | ||
|
|
||
| private Map<String, Object> getProperties( Map<String, String> columnTypes, ResultSet resultSet ) throws SQLException | ||
| { | ||
| Map<String, Object> properties = new HashMap<String, Object>(); | ||
| for ( Map.Entry<String, String> columnEntry : columnTypes.entrySet() ) | ||
| { | ||
| String key = columnEntry.getKey(); | ||
| Object value = getProperty( key, columnEntry.getValue(), resultSet ); | ||
| if ( value != null ) | ||
| { | ||
| properties.put( key.toLowerCase(), value ); | ||
| } | ||
| } | ||
| System.out.println( "props: " + properties ); | ||
| return properties; | ||
| } | ||
|
|
||
| private Object getProperty( String column, String type, ResultSet resultSet ) throws SQLException | ||
| { | ||
| if ( type.equals( "VARCHAR" ) ) | ||
| { | ||
| return resultSet.getString( column ); | ||
| } | ||
| else if ( type.equals( "BIGINT" ) ) | ||
| { | ||
| return resultSet.getLong( column ); | ||
| } | ||
| else if ( type.equals( "INTEGER" ) ) | ||
| { | ||
| return resultSet.getInt( column ); | ||
| } | ||
| else if ( type.equals( "TINYINT" ) ) | ||
| { | ||
| return resultSet.getByte( column ); | ||
| } | ||
| else if ( type.equals( "SMALLINT" ) ) | ||
| { | ||
| return resultSet.getShort( column ); | ||
| } | ||
| // else if ( type.equals( "char" ) ) | ||
| // { | ||
| // return s.charAt( 0 ); | ||
| // } | ||
| else if ( type.equals( "BOOLEAN" ) ) | ||
| { | ||
| return resultSet.getBoolean( column ); | ||
| } | ||
| else if ( type.equals( "FLOAT" ) ) | ||
| { | ||
| return resultSet.getFloat( column ); | ||
| } | ||
| else if ( type.equals( "DOUBLE" ) ) | ||
| { | ||
| return resultSet.getDouble( column ); | ||
| } | ||
| else | ||
| { | ||
| throw new IllegalStateException( "Unknown type: " + type ); | ||
| } | ||
| } | ||
|
|
||
| } |
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