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/***************************************************************************
* Copyright (c) 2004 - 2007 Eike Stepper, Germany.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.net4j.internal.db;
import org.eclipse.net4j.db.DBException;
import org.eclipse.net4j.db.DBType;
import org.eclipse.net4j.db.DBUtil;
import org.eclipse.net4j.db.IDBAdapter;
import org.eclipse.net4j.db.IDBTable;
import org.eclipse.net4j.internal.db.bundle.OM;
import org.eclipse.net4j.internal.util.om.trace.ContextTracer;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
/**
* @author Eike Stepper
*/
public abstract class DBAdapter implements IDBAdapter
{
private static final ContextTracer TRACER = new ContextTracer(OM.DEBUG_SQL, DBAdapter.class);
private String name;
private String version;
public DBAdapter(String name, String version)
{
this.name = name;
this.version = version;
}
public String getName()
{
return name;
}
public String getVersion()
{
return version;
}
public void createTables(IDBTable[] tables, Connection connection) throws DBException
{
Statement statement = null;
try
{
statement = connection.createStatement();
for (IDBTable table : tables)
{
createTable(table, statement);
}
}
catch (SQLException ex)
{
throw new DBException(ex);
}
finally
{
DBUtil.close(statement);
}
}
public void createTable(IDBTable table, Statement statement) throws DBException
{
try
{
doCreateTable((DBTable)table, statement);
}
catch (SQLException ex)
{
if (TRACER.isEnabled())
{
TRACER.trace("-- " + ex.getMessage());
}
}
validateTable((DBTable)table, statement);
}
@Override
public String toString()
{
return getName() + "-" + getVersion();
}
protected void doCreateTable(DBTable table, Statement statement) throws SQLException
{
StringBuilder builder = new StringBuilder();
builder.append("CREATE TABLE ");
builder.append(table.getName());
builder.append(" (");
table.appendFieldDefs(builder, createFieldDefinitions(table));
String constraints = createConstraints(table);
if (constraints != null)
{
builder.append(", ");
builder.append(constraints);
}
builder.append(")");
String sql = builder.toString();
if (TRACER.isEnabled())
{
TRACER.trace(sql);
}
statement.execute(sql);
}
protected String createConstraints(DBTable table)
{
return null;
}
protected String createFieldDefinition(DBField field)
{
return getTypeName(field) + (field.isNotNull() ? " NOT NULL" : "");
}
protected String getTypeName(DBField field)
{
DBType type = field.getType();
switch (type)
{
case BOOLEAN:
case BIT:
case TINYINT:
case SMALLINT:
case INTEGER:
case BIGINT:
case FLOAT:
case REAL:
case DOUBLE:
case DATE:
case TIME:
case TIMESTAMP:
case LONGVARCHAR:
case LONGVARBINARY:
case BLOB:
case CLOB:
return type.toString();
case CHAR:
case VARCHAR:
case BINARY:
case VARBINARY:
return type.toString() + field.formatPrecision();
case NUMERIC:
case DECIMAL:
return type.toString() + field.formatPrecisionAndScale();
}
throw new IllegalArgumentException("Unknown type: " + type);
}
protected void validateTable(DBTable table, Statement statement) throws DBException
{
try
{
StringBuilder builder = new StringBuilder();
builder.append("SELECT ");
table.appendFieldNames(builder);
builder.append(" FROM ");
builder.append(table.getName());
String sql = builder.toString();
ResultSet resultSet = statement.executeQuery(sql);
ResultSetMetaData metaData = resultSet.getMetaData();
int columnCount = metaData.getColumnCount();
if (columnCount != table.getFieldCount())
{
throw new DBException("DBTable " + table.getName() + " has " + columnCount + " columns instead of "
+ table.getFieldCount());
}
// for (int i = 0; i < columnCount; i++)
// {
// int existingCode = metaData.getColumnType(i + 1);
// DBField field = table.getField(i);
// int code = field.getType().getCode();
// if (code != existingCode)
// {
// throw new DBException("DBField " + field.getFullName() + " has type " +
// existingCode + " instead of " + code
// + " (" + field.getType() + ")");
// }
// }
}
catch (SQLException ex)
{
throw new DBException(ex.getMessage());
}
}
private String[] createFieldDefinitions(DBTable table)
{
DBField[] fields = table.getFields();
int fieldCount = fields.length;
String[] result = new String[fieldCount];
for (int i = 0; i < fieldCount; i++)
{
DBField field = fields[i];
result[i] = createFieldDefinition(field);
}
return result;
}
}
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