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PostgreSqlSymmetricDialect.java
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PostgreSqlSymmetricDialect.java
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/*
* Licensed to JumpMind Inc under one or more contributor
* license agreements. See the NOTICE file distributed
* with this work for additional information regarding
* copyright ownership. JumpMind Inc licenses this file
* to you under the GNU Lesser General Public License (the
* "License"); you may not use this file except in compliance
* with the License.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
* 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.jumpmind.symmetric.db.postgresql;
import org.jumpmind.db.platform.IDatabasePlatform;
import org.jumpmind.db.sql.ISqlTransaction;
import org.jumpmind.db.util.BinaryEncoding;
import org.jumpmind.symmetric.SymmetricException;
import org.jumpmind.symmetric.common.ParameterConstants;
import org.jumpmind.symmetric.db.AbstractSymmetricDialect;
import org.jumpmind.symmetric.db.ISymmetricDialect;
import org.jumpmind.symmetric.model.Trigger;
import org.jumpmind.symmetric.model.TriggerHistory;
import org.jumpmind.symmetric.service.IParameterService;
/*
* Support for PostgreSQL
*/
public class PostgreSqlSymmetricDialect extends AbstractSymmetricDialect implements ISymmetricDialect {
static final String TRANSACTION_ID_EXPRESSION = "txid_current()";
static final String SYNC_TRIGGERS_DISABLED_VARIABLE = "symmetric.triggers_disabled";
static final String SYNC_NODE_DISABLED_VARIABLE = "symmetric.node_disabled";
private boolean supportsTransactionId = false;
private String transactionIdExpression = "null";
public PostgreSqlSymmetricDialect(IParameterService parameterService, IDatabasePlatform platform) {
super(parameterService, platform);
this.triggerText = new PostgreSqlTriggerText();
}
@Override
protected void initTablesAndFunctionsForSpecificDialect() {
if (getMajorVersion() > 8 || (getMajorVersion() == 8 && getMinorVersion() >= 3)) {
log.info("Enabling transaction ID support");
supportsTransactionId = true;
transactionIdExpression = TRANSACTION_ID_EXPRESSION;
}
ISqlTransaction transaction = null;
try {
transaction = platform.getSqlTemplate().startSqlTransaction();
enableSyncTriggers(transaction);
} catch (Exception e) {
String message = "Please add \"custom_variable_classes = 'symmetric'\" to your postgresql.conf file";
log.error(message);
throw new SymmetricException(message, e);
} finally {
if (transaction != null) {
transaction.close();
}
}
}
@Override
public boolean requiresAutoCommitFalseToSetFetchSize() {
return true;
}
@Override
protected boolean doesTriggerExistOnPlatform(String catalogName, String schema, String tableName, String triggerName) {
return platform.getSqlTemplate().queryForInt("select count(*) from information_schema.triggers where trigger_name = ? "
+ "and event_object_table = ? and trigger_schema = ?", new Object[] { triggerName.toLowerCase(),
tableName, schema == null ? platform.getDefaultSchema() : schema }) > 0;
}
@Override
public void removeTrigger(StringBuilder sqlBuffer, String catalogName, String schemaName, String triggerName,
String tableName, TriggerHistory oldHistory) {
schemaName = schemaName == null ? "" : (schemaName + ".");
final String dropSql = "drop trigger " + triggerName + " on " + schemaName + tableName;
logSql(dropSql, sqlBuffer);
final String dropFunction = "drop function " + schemaName + "f" + triggerName + "()";
logSql(dropFunction, sqlBuffer);
if (parameterService.is(ParameterConstants.AUTO_SYNC_TRIGGERS)) {
try {
platform.getSqlTemplate().update(dropSql);
platform.getSqlTemplate().update(dropFunction);
} catch (Exception e) {
log.warn("Trigger does not exist");
}
}
}
public void disableSyncTriggers(ISqlTransaction transaction, String nodeId) {
transaction.execute("select set_config('" + SYNC_TRIGGERS_DISABLED_VARIABLE + "', '1', false)");
if (nodeId == null) {
nodeId = "";
}
transaction.execute("select set_config('" + SYNC_NODE_DISABLED_VARIABLE + "', '" + nodeId + "', false)");
}
public void enableSyncTriggers(ISqlTransaction transaction) {
transaction.execute("select set_config('" + SYNC_TRIGGERS_DISABLED_VARIABLE
+ "', '', false)");
transaction.execute("select set_config('" + SYNC_NODE_DISABLED_VARIABLE
+ "', '', false)");
}
public String getSyncTriggersExpression() {
return "$(defaultSchema)" + parameterService.getTablePrefix() + "_triggers_disabled() = 0";
}
@Override
public String getTransactionTriggerExpression(String defaultCatalog, String defaultSchema, Trigger trigger) {
return transactionIdExpression;
}
@Override
public boolean supportsTransactionId() {
return supportsTransactionId;
}
public void purge() {
}
@Override
public BinaryEncoding getBinaryEncoding() {
return BinaryEncoding.BASE64;
}
}