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/**
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* Copyright (C) 2009 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.database.update.v33_34;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.util.HashSet;
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import java.util.Set;
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import org.apache.log4j.Logger;
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import eu.etaxonomy.cdm.common.monitor.IProgressMonitor;
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import eu.etaxonomy.cdm.database.DatabaseTypeEnum;
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import eu.etaxonomy.cdm.database.ICdmDataSource;
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import eu.etaxonomy.cdm.database.update.CaseType;
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import eu.etaxonomy.cdm.database.update.ISchemaUpdaterStep;
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import eu.etaxonomy.cdm.database.update.SchemaUpdaterStepBase;
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/**
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* @author a.mueller
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* @date 16.09.2010
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*
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*/
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public class UsernameConstraintUpdater extends SchemaUpdaterStepBase<UsernameConstraintUpdater> implements ISchemaUpdaterStep {
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private static final Logger logger = Logger.getLogger(UsernameConstraintUpdater.class);
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private String tableName;
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private String columnName;
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public static final UsernameConstraintUpdater NewInstance(String stepName, String tableName, String columnName){
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return new UsernameConstraintUpdater(stepName, tableName, columnName);
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}
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protected UsernameConstraintUpdater(String stepName, String tableName, String columnName) {
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super(stepName);
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this.tableName = tableName;
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this.columnName = columnName;
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}
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@Override
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public Integer invoke(ICdmDataSource datasource, IProgressMonitor monitor, CaseType caseType) throws SQLException {
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//remove 2-fold constraint
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boolean result = removeDuplicates(datasource, caseType);
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result &= removeExistingConstraint(datasource, caseType);
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result &= createColumnConstraint(datasource, caseType);
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result &= createUuidConstraint(datasource, caseType);
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return result ? 1 : null;
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}
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private boolean removeDuplicates(ICdmDataSource datasource, CaseType caseType) {
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try {
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Set<String> existing = new HashSet<String>();
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String sql = " SELECT id, columnName as uniquecol FROM tableName ";
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sql = sql.replace("columnName", columnName).replace("tableName", caseType.transformTo(tableName));
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ResultSet rs = datasource.executeQuery(sql);
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while (rs.next()){
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int id = rs.getInt("id");
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String key = rs.getString("uniquecol");
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while (key == null || existing.contains(key.toLowerCase())){
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key = key == null ? "_" : key + "_";
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String sqlUpdate = "UPDATE tableName SET columnName = '" + key + "' WHERE id = " + id;
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sqlUpdate = sqlUpdate.replace("columnName", columnName).replace("tableName", caseType.transformTo(tableName));
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datasource.executeUpdate(sqlUpdate);
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}
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existing.add(key.toLowerCase());
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}
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return true;
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} catch (SQLException e) {
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e.printStackTrace();
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return false;
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}
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}
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private boolean createUuidConstraint(ICdmDataSource datasource, CaseType caseType) {
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try {
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String updateQuery = getCreateQuery(datasource, caseType, tableName, tableName + "_UniqueKey", "uuid");
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datasource.executeUpdate(updateQuery);
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return true;
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} catch (Exception e) {
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logger.warn("Unique index for " + tableName + ".uuid could not be created");
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return false;
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}
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}
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private boolean createColumnConstraint(ICdmDataSource datasource, CaseType caseType) {
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try {
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String updateQuery = getCreateQuery(datasource, caseType, tableName, columnName + "_", columnName);
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datasource.executeUpdate(updateQuery);
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return true;
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} catch (Exception e) {
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logger.warn("Unique index for username could not be created");
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return false;
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}
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}
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private String getCreateQuery(ICdmDataSource datasource, CaseType caseType, String tableName, String constraintName, String columnName) {
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DatabaseTypeEnum type = datasource.getDatabaseType();
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String indexName = "_UniqueKey";
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String updateQuery;
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if (type.equals(DatabaseTypeEnum.MySQL)){
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//Maybe MySQL also works with the below syntax. Did not check yet.
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updateQuery = "ALTER TABLE @@"+ tableName + "@@ ADD UNIQUE INDEX " + constraintName + " ("+columnName+");";
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}else if (type.equals(DatabaseTypeEnum.H2) || type.equals(DatabaseTypeEnum.PostgreSQL) || type.equals(DatabaseTypeEnum.SqlServer2005)){
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updateQuery = "CREATE UNIQUE INDEX " + constraintName + " ON "+tableName+"(" + columnName + ")";
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}else{
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throw new IllegalArgumentException("Datasource type not supported: " + type.getName());
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}
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updateQuery = updateQuery.replace("@indexName", indexName);
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updateQuery = caseType.replaceTableNames(updateQuery);
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return updateQuery;
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}
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private boolean removeExistingConstraint(ICdmDataSource datasource, CaseType caseType) {
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try {
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DatabaseTypeEnum type = datasource.getDatabaseType();
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String indexName = "_UniqueKey";
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String updateQuery = makeRemoveConstraintUpdateQuery(caseType, type, indexName);
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try {
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datasource.executeUpdate(updateQuery);
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} catch (Exception e) {
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indexName = "uuid";
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updateQuery = makeRemoveConstraintUpdateQuery(caseType, type, indexName);
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datasource.executeUpdate(updateQuery);
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}
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return true;
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} catch (Exception e) {
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logger.warn("Old index could not be removed");
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return false;
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}
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}
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/**
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* @param caseType
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* @param type
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* @param indexName
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* @param updateQuery
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* @return
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*/
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private String makeRemoveConstraintUpdateQuery(CaseType caseType,
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DatabaseTypeEnum type, String indexName) {
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String updateQuery;
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if (type.equals(DatabaseTypeEnum.MySQL)){
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updateQuery = "ALTER TABLE @@" + tableName + "@@ DROP INDEX @indexName";
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}else if (type.equals(DatabaseTypeEnum.H2)){
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updateQuery = "ALTER TABLE @@" + tableName + "@@ DROP CONSTRAINT IF EXISTS @indexName";
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}else if (type.equals(DatabaseTypeEnum.PostgreSQL)){
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updateQuery = "ALTER TABLE @@" + tableName + "@@ DROP CONSTRAINT @indexName";
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}else if (type.equals(DatabaseTypeEnum.SqlServer2005)){
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//TODO
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throw new RuntimeException("Remove index not yet supported for SQLServer");
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}else{
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throw new IllegalArgumentException("Datasource type not supported: " + type.getName());
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}
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updateQuery = updateQuery.replace("@indexName", indexName);
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updateQuery = caseType.replaceTableNames(updateQuery);
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return updateQuery;
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}
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}
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