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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 java.text.MessageFormat;
import com.iciql.TableDefinition.FieldDefinition;
import com.iciql.TableDefinition.IndexDefinition;
import com.iciql.util.StatementBuilder;
/**
* HyperSQL database dialect.
*/
public class SQLDialectHSQL extends SQLDialectDefault {
@Override
public boolean supportsMemoryTables() {
return true;
}
@Override
protected boolean prepareColumnDefinition(StatementBuilder buff, boolean isAutoIncrement,
boolean isPrimaryKey) {
boolean isIdentity = false;
if (isAutoIncrement && isPrimaryKey) {
buff.append(" IDENTITY");
isIdentity = true;
}
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 UNIQUE:
buff.append("UNIQUE ");
break;
case UNIQUE_HASH:
buff.append("UNIQUE ");
break;
}
buff.append("INDEX ");
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) {
final String valuePrefix = "v";
StatementBuilder buff = new StatementBuilder("MERGE INTO ");
buff.append(prepareTableName(schemaName, tableName));
// a, b, c....
buff.append(" USING (VALUES(");
for (FieldDefinition field : def.fields) {
buff.appendExceptFirst(", ");
buff.append("CAST(? AS ");
String dataType = convertSqlType(field.dataType);
buff.append(dataType);
if ("VARCHAR".equals(dataType)) {
if (field.length > 0) {
// VARCHAR(x)
buff.append(MessageFormat.format("({0})", field.length));
}
} else if ("DECIMAL".equals(dataType)) {
if (field.length > 0) {
if (field.scale > 0) {
// DECIMAL(x,y)
buff.append(MessageFormat.format("({0},{1})", field.length, field.scale));
} else {
// DECIMAL(x)
buff.append(MessageFormat.format("({0})", field.length));
}
}
}
buff.append(')');
Object value = def.getValue(obj, field);
stat.addParameter(value);
}
// map to temporary table
buff.resetCount();
buff.append(")) AS vals (");
for (FieldDefinition field : def.fields) {
buff.appendExceptFirst(", ");
buff.append(prepareColumnName(valuePrefix + field.columnName));
}
buff.append(") ON ");
// create the ON condition
// (va, vb) = (va,vb)
String[] prefixes = { "", valuePrefix };
for (int i = 0; i < prefixes.length; i++) {
String prefix = prefixes[i];
buff.resetCount();
buff.append('(');
for (FieldDefinition field : def.fields) {
if (field.isPrimaryKey) {
buff.appendExceptFirst(", ");
buff.append(prepareColumnName(prefix + field.columnName));
}
}
buff.append(")");
if (i == 0) {
buff.append('=');
}
}
// UPDATE
// set a=va
buff.append(" WHEN MATCHED THEN UPDATE SET ");
buff.resetCount();
for (FieldDefinition field : def.fields) {
buff.appendExceptFirst(", ");
buff.append(prepareColumnName(field.columnName));
buff.append('=');
buff.append(prepareColumnName(valuePrefix + field.columnName));
}
// INSERT
// insert va, vb, vc....
buff.append(" WHEN NOT MATCHED THEN INSERT ");
buff.resetCount();
buff.append(" VALUES (");
for (FieldDefinition field : def.fields) {
buff.appendExceptFirst(", ");
buff.append(prepareColumnName(valuePrefix + field.columnName));
}
buff.append(')');
stat.setSQL(buff.toString());
}
}
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