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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;
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import java.sql.SQLException;
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import org.apache.commons.lang.StringUtils;
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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.v33_34.UsernameConstraintUpdater;
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/**
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* Adds an Index on a string column.
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*
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* @see {@link UsernameConstraintUpdater}
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* @author a.mueller
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* @since 2016-10-18
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*
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*/
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public class IndexAdder extends SchemaUpdaterStepBase {
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private static final Logger logger = Logger.getLogger(IndexAdder.class);
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private String tableName;
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private String columnName;
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private Integer length;
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// ********************** FACTORY ****************************************/
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public static final IndexAdder NewStringInstance(String stepName, String tableName, String columnName, Integer length){
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return new IndexAdder(stepName, tableName, columnName, length == null ? 255 : length);
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}
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public static final IndexAdder NewIntegerInstance(String stepName, String tableName, String columnName){
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return new IndexAdder(stepName, tableName, columnName, null);
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}
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// **************************** CONSTRUCTOR *********************************/
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protected IndexAdder(String stepName, String tableName, String columnName, Integer length) {
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super(stepName);
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this.tableName = tableName;
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this.columnName = columnName;
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this.length = length;
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}
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@Override
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public void invoke(ICdmDataSource datasource, IProgressMonitor monitor,
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CaseType caseType, SchemaUpdateResult result) throws SQLException {
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//remove 2-fold constraint
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// result &= removeExistingConstraint(datasource, caseType);
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createColumnConstraint(datasource, caseType, result);
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return;
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}
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private void createColumnConstraint(ICdmDataSource datasource,
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CaseType caseType, SchemaUpdateResult result) {
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try {
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String constraintName = StringUtils.uncapitalize(tableName) + columnName + "Index";
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if(constraintName.length()>64){
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//MySQL has problems with index names > 64, https://stackoverflow.com/questions/28615903/error-1059-identifier-name-too-long-on-foreign-key-constraints-from-existing-ta
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constraintName = constraintName.replace("Base", "");
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}
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String updateQuery = getCreateQuery(datasource, caseType, tableName, constraintName, columnName);
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datasource.executeUpdate(updateQuery);
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return;
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} catch (Exception e) {
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String message = "Unique index for " + columnName + " could not be created";
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logger.warn(message);
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result.addException(e, message, "IndexAdder.createColumnConstraint");
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return;
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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 INDEX " + constraintName + " ("+columnName+ makeLength()+");";
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}else if (type.equals(DatabaseTypeEnum.H2) || type.equals(DatabaseTypeEnum.PostgreSQL) || type.equals(DatabaseTypeEnum.SqlServer2005)){
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updateQuery = "CREATE INDEX " + constraintName + " ON "+tableName+"(" + columnName + ")";
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}else{
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throw new IllegalArgumentException("Datasource type not supported yet: " + 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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* @param length2
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* @return
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*/
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private String makeLength() {
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if (length != null){
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return "(" + length + ")";
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}else{
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return "";
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}
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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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