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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.TableDefinition.FieldDefinition;
import com.iciql.TableDefinition.IndexDefinition;
import com.iciql.util.StatementBuilder;
/**
* H2 database dialect.
*/
public class SQLDialectH2 extends SQLDialectDefault {
/**
* CACHED tables are created by default. MEMORY tables are created upon
* request.
*/
@Override
protected <T> String prepareCreateTable(TableDefinition<T> def) {
if (def.memoryTable) {
return "CREATE MEMORY TABLE IF NOT EXISTS";
} else {
return "CREATE CACHED TABLE IF NOT EXISTS";
}
}
@Override
protected <T> String prepareCreateView(TableDefinition<T> def) {
return "CREATE VIEW IF NOT EXISTS";
}
@Override
public <T> void prepareDropView(SQLStatement stat, TableDefinition<T> def) {
StatementBuilder buff = new StatementBuilder("DROP VIEW IF EXISTS "
+ prepareTableName(def.schemaName, def.tableName));
stat.setSQL(buff.toString());
return;
}
@Override
protected boolean prepareColumnDefinition(StatementBuilder buff, String dataType,
boolean isAutoIncrement, boolean isPrimaryKey) {
String convertedType = convertSqlType(dataType);
boolean isIdentity = false;
if (isIntegerType(dataType)) {
if (isAutoIncrement && isPrimaryKey) {
buff.append("IDENTITY");
isIdentity = true;
} else if (isAutoIncrement) {
buff.append(convertedType);
buff.append(" AUTO_INCREMENT");
} else {
buff.append(convertedType);
}
} else {
buff.append(convertedType);
}
return isIdentity;
}
@Override
public void prepareCreateIndex(SQLStatement stat, String schema, String table, IndexDefinition index) {
StatementBuilder buff = new StatementBuilder();
buff.append("CREATE ");
switch (index.type) {
case STANDARD:
break;
case UNIQUE:
buff.append("UNIQUE ");
break;
case HASH:
buff.append("HASH ");
break;
case UNIQUE_HASH:
buff.append("UNIQUE HASH ");
break;
}
buff.append("INDEX IF NOT EXISTS ");
buff.append(index.indexName);
buff.append(" ON ");
buff.append(table);
buff.append("(");
for (String col : index.columnNames) {
buff.appendExceptFirst(", ");
buff.append(col);
}
buff.append(")");
stat.setSQL(buff.toString());
}
@Override
public <T> void prepareMerge(SQLStatement stat, String schemaName, String tableName,
TableDefinition<T> def, Object obj) {
StatementBuilder buff = new StatementBuilder("MERGE INTO ");
buff.append(prepareTableName(schemaName, tableName)).append(" (");
buff.resetCount();
for (FieldDefinition field : def.fields) {
buff.appendExceptFirst(", ");
buff.append(field.columnName);
}
buff.append(") KEY(");
buff.resetCount();
for (FieldDefinition field : def.fields) {
if (field.isPrimaryKey) {
buff.appendExceptFirst(", ");
buff.append(field.columnName);
}
}
buff.append(") ");
buff.resetCount();
buff.append("VALUES (");
for (FieldDefinition field : def.fields) {
buff.appendExceptFirst(", ");
buff.append('?');
Object value = def.getValue(obj, field);
stat.addParameter(value);
}
buff.append(')');
stat.setSQL(buff.toString());
}
}
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