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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.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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/**
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* Dropps a UNIQUE index on a column in a table. If no unique index exists on the column no operation is executed.
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*
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* Tested: MySQL, H2, PostGreSQL
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* Not tested for: SQL Server (throws exception)
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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 UniqueIndexDropper extends AuditedSchemaUpdaterStepBase<UniqueIndexDropper> {
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@SuppressWarnings("unused")
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private static final Logger logger = Logger.getLogger(UniqueIndexDropper.class);
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private final String indexColumn;
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public static final UniqueIndexDropper NewInstance(String tableName, String indexColumn, boolean includeAudTable){
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String stepName = "Drop index " + tableName + "-" + indexColumn;
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return new UniqueIndexDropper(stepName, tableName, indexColumn, includeAudTable);
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}
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protected UniqueIndexDropper(String stepName, String tableName, String indexColumn, boolean includeAudTable) {
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super(stepName, tableName, includeAudTable);
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this.indexColumn = indexColumn;
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}
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@Override
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protected boolean invokeOnTable(String tableName, ICdmDataSource datasource, IProgressMonitor monitor, CaseType caseType) {
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try {
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if (checkExists(datasource, caseType)){
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String updateQuery = getUpdateQueryString(tableName, datasource, caseType, monitor);
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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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monitor.warning(e.getMessage(), e);
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return false;
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}
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}
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private boolean checkExists(ICdmDataSource datasource, CaseType caseType) throws SQLException, DatabaseTypeNotSupportedException {
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DatabaseTypeEnum type = datasource.getDatabaseType();
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if (type.equals(DatabaseTypeEnum.MySQL)){
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String sql = " SELECT count(*)" +
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" FROM information_schema.KEY_COLUMN_USAGE kcu " +
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" INNER JOIN information_schema.TABLE_CONSTRAINTS tc ON kcu.CONSTRAINT_NAME = tc.CONSTRAINT_NAME " +
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" AND tc.TABLE_NAME = kcu.TABLE_NAME AND tc.TABLE_SCHEMA = kcu.TABLE_SCHEMA " +
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" WHERE kcu.table_name ='@tableName' AND kcu.CONSTRAINT_SCHEMA = '@dbName' " +
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" AND kcu.COLUMN_NAME = '@columnName' AND CONSTRAINT_TYPE = 'UNIQUE' ";
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sql = sql.replace("@tableName", tableName);
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sql = sql.replace("@columnName", indexColumn);
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sql = sql.replace("@dbName", datasource.getDatabase());
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long count = (Long)datasource.getSingleValue(sql);
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return count > 0;
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}else if (type.equals(DatabaseTypeEnum.PostgreSQL)){
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String indexName = getIndexName(datasource, caseType);
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return indexName != null;
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}else if (type.equals(DatabaseTypeEnum.H2)){
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String indexName = getIndexName(datasource, caseType);
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return indexName != null;
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}else{
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// not needed
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return true;
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}
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}
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public String getUpdateQueryString(String tableName, ICdmDataSource datasource, CaseType caseType, IProgressMonitor monitor) throws DatabaseTypeNotSupportedException, SQLException {
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//NOTE: no caseType required here
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String updateQuery;
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DatabaseTypeEnum type = datasource.getDatabaseType();
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String indexName = getIndexName(datasource, caseType);
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// if (type.equals(DatabaseTypeEnum.SqlServer2005)){
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//MySQL allows both syntaxes
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// updateQuery = "ALTER TABLE @tableName ADD @columnName @columnType";
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// }else
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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 = "DROP INDEX IF EXISTS @indexName"; // does not work because index is used in the constraint
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// updateQuery = "ALTER TABLE @tableName DROP CONSTRAINT IF EXISTS @indexName"; //"if exists" does not work (version 8.4)
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updateQuery = "ALTER TABLE @tableName DROP CONSTRAINT @indexName";
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}else if (type.equals(DatabaseTypeEnum.MySQL)){
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updateQuery = "ALTER TABLE @tableName DROP INDEX @indexName";
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}else{
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updateQuery = null;
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String warning = "Update step '" + this.getStepName() + "' is not supported by " + type.getName();
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monitor.warning(warning);
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throw new DatabaseTypeNotSupportedException(warning);
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}
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updateQuery = updateQuery.replace("@tableName", tableName);
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updateQuery = updateQuery.replace("@indexName", indexName);
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return updateQuery;
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}
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private String getIndexName(ICdmDataSource datasource, CaseType caseType) throws DatabaseTypeNotSupportedException, SQLException {
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String result = this.indexColumn;
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DatabaseTypeEnum type = datasource.getDatabaseType();
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if (type.equals(DatabaseTypeEnum.SqlServer2005)){
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throw new DatabaseTypeNotSupportedException(type.toString());
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}else if (type.equals(DatabaseTypeEnum.MySQL)){
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String sql = "SELECT kcu.CONSTRAINT_NAME FROM information_schema.KEY_COLUMN_USAGE kcu " +
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" INNER JOIN information_schema.TABLE_CONSTRAINTS tc ON kcu.CONSTRAINT_NAME = tc.CONSTRAINT_NAME " +
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" AND tc.TABLE_NAME = kcu.TABLE_NAME AND tc.TABLE_SCHEMA = kcu.TABLE_SCHEMA " +
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" WHERE kcu.TABLE_NAME = '@tableName' AND kcu.TABLE_SCHEMA = '@dbName' AND kcu.COLUMN_NAME = '@columnName' "+
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" AND tc.TABLE_NAME = '@tableName' AND tc.TABLE_SCHEMA = '@dbName' AND CONSTRAINT_TYPE = 'UNIQUE' ";
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sql = sql.replace("@tableName", caseType.replaceTableNames(tableName));
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sql = sql.replace("@columnName", indexColumn);
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sql = sql.replace("@dbName", datasource.getDatabase());
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String constraintName = (String)datasource.getSingleValue(sql);
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result = constraintName;
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}else if (type.equals(DatabaseTypeEnum.H2) ){
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// String sql = "SELECT INDEX_NAME FROM INFORMATION_SCHEMA.INDEXES WHERE TABLE_NAME = @tableName AND INDEX_TYPE_NAME = 'UNIQUE INDEX'";
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String sql = "SELECT CONSTRAINT_NAME " +
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" FROM INFORMATION_SCHEMA.CONSTRAINTS "+
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" WHERE CONSTRAINT_CATALOG = '@dbName' AND "+
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" TABLE_NAME = '@tableName' AND CONSTRAINT_TYPE = 'UNIQUE' AND "+
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" COLUMN_LIST = '@columnName'";
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sql = sql.replace("@tableName", tableName.toUpperCase());
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sql = sql.replace("@columnName", indexColumn.toUpperCase());
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sql = sql.replace("@dbName", datasource.getDatabase().toUpperCase());
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String constraintName = (String)datasource.getSingleValue(sql);
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result = constraintName;
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}else if (type.equals(DatabaseTypeEnum.PostgreSQL)){
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String sql = " SELECT tc.constraint_name " +
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" FROM information_schema.table_constraints tc " +
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" LEFT JOIN information_schema.key_column_usage kcu " +
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" ON tc.constraint_catalog = kcu.constraint_catalog " +
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" AND tc.constraint_schema = kcu.constraint_schema " +
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" AND tc.constraint_name = kcu.constraint_name " +
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" WHERE tc.constraint_type = 'UNIQUE' AND tc.table_name = '@tableName' " +
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" AND kcu.column_name = '@columnName' AND tc.table_catalog = '@dbName'";
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sql = sql.replace("@tableName", tableName.toLowerCase()); //postgres is folding to lower_case not upper case (the later is SQL standard)
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sql = sql.replace("@columnName", indexColumn);
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sql = sql.replace("@dbName", datasource.getDatabase());
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String constraintName = (String)datasource.getSingleValue(sql);
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result = constraintName;
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}else{
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throw new DatabaseTypeNotSupportedException(type.toString());
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}
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return result;
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}
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}
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