/*
* Copyright 2004-2006 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.apache.lucene.store.jdbc.dialect;
/**
* A PostgreSQL dialect.
*
* @author kimchy
*/
public class PostgreSQLDialect extends Dialect {
/**
* PostreSQL supports select ... for update.
*/
public boolean supportsForUpdate() {
return true;
}
/**
* PostgreSQL supports transactional scoped blobs.
*/
public boolean supportTransactionalScopedBlobs() {
return true;
}
/**
* PostrgreSQL supports a table exists query.
*/
public boolean supportsTableExists() {
return true;
}
public String sqlTableExists(String catalog, String schemaName) {
if (schemaName == null || schemaName.length() == 0) {
schemaName = "public";
}
return "select tablename from pg_tables where schemaname = '" + schemaName + "' and lower(tablename) = ?";
}
public boolean supportsCurrentTimestampSelection() {
return true;
}
public boolean isCurrentTimestampSelectStringCallable() {
return false;
}
public boolean useInputStreamToInsertBlob() {
return false;
}
public String getCurrentTimestampSelectString() {
return "select now()";
}
public String getVarcharType(int length) {
return "varchar(" + length + ")";
}
public String getBlobType(long length) {
return "oid";
}
public String getNumberType() {
return "int4";
}
public String getTimestampType() {
return "timestamp";
}
public String getCurrentTimestampFunction() {
return "current_timestamp";
}
public String getBitType() {
return "bool";
}
}
|