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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.util.StatementBuilder;
-
- import java.text.MessageFormat;
-
- /**
- * HyperSQL database dialect.
- */
- public class SQLDialectHSQL 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
- 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) {
- boolean isIdentity = false;
- String convertedType = convertSqlType(dataType);
- buff.append(convertedType);
- if (isIntegerType(dataType) && isAutoIncrement && isPrimaryKey) {
- buff.append(" IDENTITY");
- isIdentity = true;
- }
- return isIdentity;
- }
-
- @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);
- Object parameter = serialize(value, field.typeAdapter);
- stat.addParameter(parameter);
- }
-
- // 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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