Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ package org.syncope.core.util; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.SQLException; import java.sql.Statement; import java.sql.Types; import java.text.ParseException; import java.util.ArrayList; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Properties; import java.util.Set; import javax.persistence.EntityManager; import javax.persistence.Query; import javax.persistence.TemporalType; import javax.sql.DataSource; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerConfigurationException; import javax.xml.transform.sax.SAXTransformerFactory; import javax.xml.transform.sax.TransformerHandler; import javax.xml.transform.stream.StreamResult; import org.apache.commons.lang.time.DateUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.jdbc.datasource.DataSourceUtils; import org.springframework.stereotype.Component; import org.syncope.client.SyncopeConstants; import org.syncope.core.util.multiparent.CycleInMultiParentTreeException; import org.syncope.core.util.multiparent.MultiParentNode; import org.syncope.core.util.multiparent.MultiParentNodeOp; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.AttributesImpl; import org.xml.sax.helpers.DefaultHandler; @Component public class ImportExport extends DefaultHandler { /** * Logger. */ private static final Logger LOG = LoggerFactory.getLogger(ImportExport.class); private final static String ROOT_ELEMENT = "dataset"; @Autowired private EntityManager entityManager; @Autowired private DataSource dataSource; private String readSchema() { String schema = null; InputStream dbPropsStream = null; try { dbPropsStream = getClass().getResourceAsStream("/persistence.properties"); Properties dbProps = new Properties(); dbProps.load(dbPropsStream); schema = dbProps.getProperty("database.schema"); } catch (Throwable t) { if (LOG.isDebugEnabled()) { LOG.debug("Could not find persistence.properties", t); } else { LOG.error("Could not find persistence.properties"); } } finally { if (dbPropsStream != null) { try { dbPropsStream.close(); } catch (IOException e) { LOG.error("While trying to read persistence.properties", e); } } } return schema; } private void setParameters(final String tableName, final Attributes atts, final Query query) { Map<String, Integer> colTypes = new HashMap<String, Integer>(); Connection conn = DataSourceUtils.getConnection(dataSource); ResultSet rs = null; Statement stmt = null; try { stmt = conn.createStatement(); rs = stmt.executeQuery("SELECT * FROM " + tableName); for (int i = 0; i < rs.getMetaData().getColumnCount(); i++) { colTypes.put(rs.getMetaData().getColumnName(i + 1).toUpperCase(), rs.getMetaData().getColumnType(i + 1)); } } catch (SQLException e) { LOG.error("While", e); } finally { if (stmt != null) { try { stmt.close(); } catch (SQLException e) { LOG.error("While closing statement", e); } } if (rs != null) { try { rs.close(); } catch (SQLException e) { LOG.error("While closing result set", e); } } DataSourceUtils.releaseConnection(conn, dataSource); } for (int i = 0; i < atts.getLength(); i++) { Integer colType = colTypes.get(atts.getQName(i).toUpperCase()); if (colType == null) { LOG.warn("No column type found for {}", atts.getQName(i).toUpperCase()); colType = Types.VARCHAR; } switch (colType) { case Types.NUMERIC: case Types.REAL: case Types.INTEGER: case Types.TINYINT: try { query.setParameter(i + 1, Integer.valueOf(atts.getValue(i))); } catch (NumberFormatException e) { LOG.error("Unparsable Integer '{}'", atts.getValue(i)); query.setParameter(i + 1, atts.getValue(i)); } break; case Types.DECIMAL: case Types.BIGINT: try { query.setParameter(i + 1, Long.valueOf(atts.getValue(i))); } catch (NumberFormatException e) { LOG.error("Unparsable Long '{}'", atts.getValue(i)); query.setParameter(i + 1, atts.getValue(i)); } break; case Types.DOUBLE: try { query.setParameter(i + 1, Double.valueOf(atts.getValue(i))); } catch (NumberFormatException e) { LOG.error("Unparsable Double '{}'", atts.getValue(i)); query.setParameter(i + 1, atts.getValue(i)); } break; case Types.FLOAT: try { query.setParameter(i + 1, Float.valueOf(atts.getValue(i))); } catch (NumberFormatException e) { LOG.error("Unparsable Float '{}'", atts.getValue(i)); query.setParameter(i + 1, atts.getValue(i)); } break; case Types.DATE: case Types.TIME: case Types.TIMESTAMP: try { query.setParameter(i + 1, DateUtils.parseDate(atts.getValue(i), SyncopeConstants.DATE_PATTERNS), TemporalType.TIMESTAMP); } catch (ParseException e) { LOG.error("Unparsable Date '{}'", atts.getValue(i)); query.setParameter(i + 1, atts.getValue(i)); } break; case Types.BIT: case Types.BOOLEAN: query.setParameter(i + 1, "1".equals(atts.getValue(i)) ? Boolean.TRUE : Boolean.FALSE); break; default: query.setParameter(i + 1, atts.getValue(i)); } } } @Override public void startElement(final String uri, final String localName, final String qName, final Attributes atts) throws SAXException { // skip root element if (ROOT_ELEMENT.equals(qName)) { return; } StringBuilder queryString = new StringBuilder("INSERT INTO ").append(qName).append('('); StringBuilder values = new StringBuilder(); for (int i = 0; i < atts.getLength(); i++) { queryString.append(atts.getQName(i)); values.append('?'); if (i < atts.getLength() - 1) { queryString.append(','); values.append(','); } } queryString.append(") VALUES (").append(values).append(')'); Query query = entityManager.createNativeQuery(queryString.toString()); setParameters(qName, atts, query); query.executeUpdate(); } private void doExportTable(final TransformerHandler handler, final Connection conn, final String tableName) throws SQLException, SAXException { AttributesImpl atts = new AttributesImpl(); PreparedStatement stmt = null; ResultSet rs = null; try { stmt = conn.prepareStatement("SELECT * FROM " + tableName + " a"); rs = stmt.executeQuery(); for (int rowNo = 0; rs.next(); rowNo++) { atts.clear(); ResultSetMetaData metaData = rs.getMetaData(); for (int i = 0; i < metaData.getColumnCount(); i++) { String columnName = metaData.getColumnName(i + 1); String value = rs.getString(columnName); if (value != null) { atts.addAttribute("", "", columnName, "CDATA", value); } } handler.startElement("", "", tableName, atts); handler.endElement("", "", tableName); } } finally { if (rs != null) { try { rs.close(); } catch (SQLException e) { LOG.error("While closing result set", e); } } if (stmt != null) { try { stmt.close(); } catch (SQLException e) { LOG.error("While closing result set", e); } } } } private List<String> sortByForeignKeys(final Connection conn, final Set<String> tableNames) throws SQLException, CycleInMultiParentTreeException { MultiParentNode<String> root = new MultiParentNode<String>(ROOT_ELEMENT); for (String tableName : tableNames) { MultiParentNode<String> node = MultiParentNodeOp.findInTree(root, tableName); if (node == null) { node = new MultiParentNode<String>(tableName); root.addChild(node); } ResultSet rs = null; try { rs = conn.getMetaData().getExportedKeys(conn.getCatalog(), readSchema(), tableName); while (rs.next()) { String fkTableName = rs.getString("FKTABLE_NAME"); if (!tableName.equals(fkTableName)) { MultiParentNode<String> fkNode = MultiParentNodeOp.findInTree(root, fkTableName); if (fkNode == null) { fkNode = new MultiParentNode<String>(fkTableName); root.addChild(fkNode); } fkNode.addChild(node); if (root.isParent(node)) { root.removeChild(node); } } } } finally { if (rs != null) { try { rs.close(); } catch (SQLException e) { LOG.error("While closing tables result set", e); } } } } List<String> sortedTableNames = new ArrayList<String>(tableNames.size()); MultiParentNodeOp.traverseTree(root, sortedTableNames); return sortedTableNames.subList(0, sortedTableNames.size() - 1); } public void export(final OutputStream os) throws SAXException, TransformerConfigurationException, CycleInMultiParentTreeException { StreamResult streamResult = new StreamResult(os); SAXTransformerFactory transformerFactory = (SAXTransformerFactory) SAXTransformerFactory.newInstance(); TransformerHandler handler = transformerFactory.newTransformerHandler(); Transformer serializer = handler.getTransformer(); serializer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); serializer.setOutputProperty(OutputKeys.INDENT, "yes"); handler.setResult(streamResult); handler.startDocument(); handler.startElement("", "", ROOT_ELEMENT, new AttributesImpl()); Connection conn = DataSourceUtils.getConnection(dataSource); ResultSet rs = null; try { // first read all tables... rs = conn.getMetaData().getTables(null, null, null, new String[] { "TABLE" }); Set<String> tableNames = new HashSet<String>(); while (rs.next()) { String tableName = rs.getString("TABLE_NAME"); // these tables must be ignored if (!tableName.toUpperCase().startsWith("QRTZ_") && !tableName.toUpperCase().equals("ACT_GE_PROPERTY")) { tableNames.add(tableName); } } // then sort tables based on foreign keys and dump for (String tableName : sortByForeignKeys(conn, tableNames)) { doExportTable(handler, conn, tableName); } } catch (SQLException e) { LOG.error("While exporting database content", e); } finally { if (rs != null) { try { rs.close(); } catch (SQLException e) { LOG.error("While closing tables result set", e); } } DataSourceUtils.releaseConnection(conn, dataSource); } handler.endElement("", "", ROOT_ELEMENT); handler.endDocument(); } }