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/**
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* Copyright (C) 2015 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.taxeditor.util;
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/**
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* based on from http://code.google.com/p/java-tester/source/browse/trunk/src/main/java/org/jtester/unitils/database/H2DbSupport.java
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*/
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import java.util.Set;
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import org.unitils.core.dbsupport.DbSupport;
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public class H2DbSupport extends DbSupport {
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/**
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* Creates support for H2 databases.
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*/
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public H2DbSupport() {
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super("h2");
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}
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@Override
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public Set<String> getColumnNames(String tableName) {
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return getSQLHandler().getItemsAsStringSet(
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"select COLUMN_NAME from INFORMATION_SCHEMA.COLUMNS where TABLE_NAME = '" + tableName
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+ "' AND TABLE_SCHEMA = '" + getSchemaName() + "'");
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}
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@Override
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public Set<String> getTableNames() {
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return getSQLHandler().getItemsAsStringSet(
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"select TABLE_NAME from INFORMATION_SCHEMA.TABLES where TABLE_TYPE = 'TABLE' AND TABLE_SCHEMA = '"
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+ getSchemaName() + "'");
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}
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@Override
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public Set<String> getViewNames() {
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return getSQLHandler().getItemsAsStringSet(
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"select TABLE_NAME from INFORMATION_SCHEMA.TABLES where TABLE_TYPE = 'VIEW' AND TABLE_SCHEMA = '"
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+ getSchemaName() + "'");
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}
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@Override
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public Set<String> getSequenceNames() {
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return getSQLHandler().getItemsAsStringSet(
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"select SEQUENCE_NAME from INFORMATION_SCHEMA.SEQUENCES where SEQUENCE_SCHEMA = '"
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+ getSchemaName() + "'");
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}
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@Override
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public Set<String> getTriggerNames() {
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return getSQLHandler().getItemsAsStringSet(
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"select TRIGGER_NAME from INFORMATION_SCHEMA.TRIGGERS where TRIGGER_SCHEMA = '" + getSchemaName()
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+ "'");
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}
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@Override
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public long getSequenceValue(String sequenceName) {
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return getSQLHandler().getItemAsLong(
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"select CURRENT_VALUE from INFORMATION_SCHEMA.SEQUENCES where SEQUENCE_SCHEMA = '"
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+ getSchemaName() + "' and SEQUENCE_NAME = '" + sequenceName + "'");
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}
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@Override
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public boolean supportsSequences() {
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return true;
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}
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@Override
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public boolean supportsTriggers() {
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return true;
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}
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@Override
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public boolean supportsIdentityColumns() {
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return true;
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}
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@Override
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public void incrementSequenceToValue(String sequenceName, long newSequenceValue) {
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getSQLHandler().executeUpdate(
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"alter sequence " + qualified(sequenceName) + " restart with " + newSequenceValue);
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}
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@Override
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public void incrementIdentityColumnToValue(String tableName, String identityColumnName, long identityValue) {
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getSQLHandler().executeUpdate(
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"alter table " + qualified(tableName) + " alter column " + quoted(identityColumnName)
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+ " RESTART WITH " + identityValue);
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}
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@Override
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public void disableReferentialConstraints() {
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Set<String> tableNames = getTableNames();
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for (String tableName : tableNames) {
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disableReferentialConstraints(tableName);
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}
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}
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@Override
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public void disableValueConstraints() {
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Set<String> tableNames = getTableNames();
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for (String tableName : tableNames) {
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disableValueConstraints(tableName);
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}
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}
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private void disableReferentialConstraints(String tableName) {
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Set<String> constraintNames = this.getForeignKeyConstraintNames(tableName);
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for (String constraintName : constraintNames) {
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this.removeForeignKeyConstraint(tableName, constraintName);
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}
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}
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private void disableValueConstraints(String tableName) {
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Set<String> primaryKeyColumnNames = this.getPrimaryKeyColumnNames(tableName);
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Set<String> notNullColumnNames = this.getNotNullColummnNames(tableName);
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for (String notNullColumnName : notNullColumnNames) {
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if (primaryKeyColumnNames.contains(notNullColumnName)) {
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continue;
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}
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this.removeNotNullConstraint(tableName, notNullColumnName);
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}
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}
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/**
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* Gets the names of all identity columns of the given table.
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* <p/>
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* todo check, at this moment the PK columns are returned
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*
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* @param tableName The table, not null
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* @return The names of the identity columns of the table with the given name
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*/
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@Override
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public Set<String> getIdentityColumnNames(String tableName) {
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return getPrimaryKeyColumnNames(tableName);
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}
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private Set<String> getPrimaryKeyColumnNames(String tableName) {
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return getSQLHandler().getItemsAsStringSet(
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"select COLUMN_NAME from INFORMATION_SCHEMA.INDEXES where PRIMARY_KEY=TRUE AND TABLE_NAME = '"
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+ tableName + "' AND TABLE_SCHEMA = '" + getSchemaName() + "'");
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}
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private Set<String> getNotNullColummnNames(String tableName) {
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return getSQLHandler().getItemsAsStringSet(
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"select COLUMN_NAME from INFORMATION_SCHEMA.COLUMNS where IS_NULLABLE = 'NO' AND TABLE_NAME = '"
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+ tableName + "' AND TABLE_SCHEMA = '" + getSchemaName() + "'");
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}
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private Set<String> getForeignKeyConstraintNames(String tableName) {
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return getSQLHandler().getItemsAsStringSet(
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"select CONSTRAINT_NAME from INFORMATION_SCHEMA.CONSTRAINTS "
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+ "where CONSTRAINT_TYPE = 'REFERENTIAL' AND TABLE_NAME = '" + tableName
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+ "' AND CONSTRAINT_SCHEMA = '" + getSchemaName() + "'");
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}
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private void removeForeignKeyConstraint(String tableName, String constraintName) {
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getSQLHandler().executeUpdate(
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"alter table " + qualified(tableName) + " drop constraint " + quoted(constraintName));
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}
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private void removeNotNullConstraint(String tableName, String columnName) {
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getSQLHandler().executeUpdate(
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"alter table " + qualified(tableName) + " alter column " + quoted(columnName) + " set null");
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}
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}
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