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/*
* Copyright 2011 James Moger.
*
* 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 com.iciql;
import com.iciql.util.StatementBuilder;
import com.iciql.util.StringUtils;
/**
* Derby database dialect.
*/
public class SQLDialectDerby extends SQLDialectDefault {
@Override
public Class<? extends java.util.Date> getDateTimeClass() {
return java.sql.Timestamp.class;
}
@Override
public String convertSqlType(String sqlType) {
if ("TINYINT".equals(sqlType)) {
// Derby does not have a TINYINT/BYTE type
return "SMALLINT";
}
return sqlType;
}
@Override
public void appendLimitOffset(SQLStatement stat, long limit, long offset) {
// FETCH/OFFSET added in 10.5
if (databaseMajorVersion >= 10 && databaseMinorVersion >= 5) {
if (offset > 0) {
stat.appendSQL(" OFFSET " + offset + (offset == 1 ? " ROW" : " ROWS"));
}
if (limit > 0) {
stat.appendSQL(" FETCH NEXT " + limit + (limit == 1 ? " ROW" : " ROWS") + " ONLY");
}
}
}
@Override
protected boolean prepareColumnDefinition(StatementBuilder buff, String dataType,
boolean isAutoIncrement, boolean isPrimaryKey) {
String convertedType = convertSqlType(dataType);
buff.append(convertedType);
if (isIntegerType(dataType) && isAutoIncrement) {
buff.append(" GENERATED BY DEFAULT AS IDENTITY");
}
return false;
}
@Override
public String prepareColumnConstraint(boolean isAutoIncrement, boolean isPrimaryKey, boolean nullable, Class<?> fieldType, String dataType, String defaultValue) {
StringBuilder sb = new StringBuilder();
if (!isAutoIncrement && !isPrimaryKey) {
if (nullable && (defaultValue == null || ((dataType.equals("TIMESTAMP") || dataType.equals("DATETIME")) && StringUtils.isNullOrEmpty(defaultValue)))) {
sb.append(" DEFAULT NULL");
} else if (!StringUtils.isNullOrEmpty(defaultValue)) {
if (ModelUtils.isProperlyFormattedDefaultValue(defaultValue)
&& ModelUtils.isValidDefaultValue(fieldType, defaultValue)) {
sb.append(" DEFAULT ").append(defaultValue);
}
}
}
if (!nullable) {
sb.append(" NOT NULL");
}
return sb.toString();
}
@Override
public <T> void prepareDropTable(SQLStatement stat, TableDefinition<T> def) {
StatementBuilder buff = new StatementBuilder("DROP TABLE "
+ prepareTableName(def.schemaName, def.tableName));
stat.setSQL(buff.toString());
return;
}
@Override
public <T, A> void prepareBitwiseAnd(SQLStatement stat, Query<T> query, A x, A y) {
throw new IciqlException("{0} does not support bitwise operator AND", databaseName);
}
@Override
public <T, A> void prepareBitwiseXor(SQLStatement stat, Query<T> query, A x, A y) {
throw new IciqlException("{0} does not support bitwise operator XOR", databaseName);
}
}
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