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/*
* Copyright 2014 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.sql.Date;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Time;
import java.sql.Timestamp;
import com.iciql.TableDefinition.FieldDefinition;
import com.iciql.TableDefinition.IndexDefinition;
import com.iciql.util.IciqlLogger;
import com.iciql.util.StatementBuilder;
/**
* SQLite database dialect.
*/
public class SQLDialectSQLite extends SQLDialectDefault {
@Override
public boolean supportsSavePoints() {
return false;
}
@Override
public void configureDialect(Db db) {
super.configureDialect(db);
// enable foreign key constraint enforcement
db.executeUpdate("PRAGMA foreign_keys = ON;");
}
@Override
protected <T> String prepareCreateTable(TableDefinition<T> def) {
return "CREATE TABLE IF NOT EXISTS";
}
@Override
protected <T> String prepareCreateView(TableDefinition<T> def) {
return "CREATE VIEW IF NOT EXISTS";
}
@Override
public String convertSqlType(String sqlType) {
if (isIntegerType(sqlType)) {
return "INTEGER";
}
return sqlType;
}
@Override
protected boolean prepareColumnDefinition(StatementBuilder buff, String dataType,
boolean isAutoIncrement, boolean isPrimaryKey) {
String convertedType = convertSqlType(dataType);
buff.append(convertedType);
if (isPrimaryKey) {
buff.append(" PRIMARY KEY");
if (isAutoIncrement) {
buff.append(" AUTOINCREMENT");
}
return true;
}
return false;
}
@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
public void prepareCreateIndex(SQLStatement stat, String schemaName, String tableName,
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;
default:
IciqlLogger.warn("{0} does not support hash indexes", getClass().getSimpleName());
}
buff.append("INDEX IF NOT EXISTS ");
buff.append(index.indexName);
buff.append(" ON ");
// FIXME maybe we can use schemaName ?
// buff.append(prepareTableName(schemaName, tableName));
buff.append(tableName);
buff.append("(");
for (String col : index.columnNames) {
buff.appendExceptFirst(", ");
buff.append(prepareColumnName(col));
}
buff.append(") ");
stat.setSQL(buff.toString().trim());
}
@Override
public <T> void prepareMerge(SQLStatement stat, String schemaName, String tableName,
TableDefinition<T> def, Object obj) {
StatementBuilder buff = new StatementBuilder("INSERT OR REPLACE INTO ");
buff.append(prepareTableName(schemaName, tableName)).append(" (");
buff.resetCount();
for (FieldDefinition field : def.fields) {
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);
Object parameter = serialize(value);
stat.addParameter(parameter);
}
buff.append(')');
stat.setSQL(buff.toString());
}
@Override
public Object deserialize(ResultSet rs, int columnIndex, Class<?> targetType) {
try {
return super.deserialize(rs, columnIndex, targetType);
} catch (IciqlException e) {
if (e.getMessage().startsWith("Can not convert")) {
try {
// give the SQLite JDBC driver an opportunity to deserialize DateTime objects
if (Timestamp.class.equals(targetType)) {
return rs.getTimestamp(columnIndex);
} else if (Time.class.equals(targetType)) {
return rs.getTime(columnIndex);
} else if (Date.class.equals(targetType)) {
return rs.getDate(columnIndex);
} else if (java.util.Date.class.equals(targetType)) {
Timestamp timestamp = rs.getTimestamp(columnIndex);
return new java.util.Date(timestamp.getTime());
}
} catch (SQLException x) {
throw new IciqlException(x, "Can not convert the value at column {0} to {1}",
columnIndex, targetType.getName());
}
}
// rethrow e
throw e;
}
}
@Override
public String prepareStringParameter(Object o) {
if (o instanceof Boolean) {
// SQLite does not have an explicit BOOLEAN type
Boolean bool = (Boolean) o;
return bool ? "1" : "0";
}
return super.prepareStringParameter(o);
}
}
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