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JavaOnTracks 0.1.2
  net.jot.persistance.query. JOTDBQueryImpl View Javadoc
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/*
------------------------------------
JavaOnTracks          Thibaut Colar
tcolar-jot AT colar DOT net
Artistic Licence 2.0
http://www.javaontracks.net
------------------------------------
 */
package net.jot.persistance.query;

import net.jot.persistance.JOTQueryResult;
import net.jot.persistance.JOTTransaction;
import java.lang.reflect.Field;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;

import net.jot.db.JOTDBField;
import net.jot.db.JOTDBManager;
import net.jot.db.JOTTaggedConnection;
import net.jot.logger.JOTLogger;
import net.jot.persistance.JOTModel;
import net.jot.persistance.JOTModelMapping;
import net.jot.persistance.builders.JOTQueryBuilder;
import net.jot.persistance.JOTSQLCondition;
import net.jot.persistance.JOTStatementFlags;

/**
 * Implementation of The Query Interface for an SQL database.<br>
 * Handle all the SQL CRUD functions
 * Transforms DB java objects into actual SQL queries string and back.
 * @author thibautc
 *
 */
public class JOTDBQueryImpl implements JOTQueryInterface
{

	public JOTQueryResult executeSQL(JOTTransaction transaction, JOTModelMapping mapping, Class objectClass, String sql, Object[] params, JOTStatementFlags flags) throws Exception
	{
		ResultSet rs = null;
		JOTTaggedConnection con = getConnection(transaction, mapping);
		try
		{
			rs = JOTDBManager.getInstance().query(con, sql, params, flags);
		} catch (SQLException e)
		{
			JOTLogger.logException(JOTLogger.CAT_DB, JOTLogger.ERROR_LEVEL, "JOTDBModel", "Error", e);
			throw (e);
		} finally
		{
			if (transaction == null)
			{
				JOTDBManager.getInstance().releaseConnection(con);
			}
		}
		return LoadFromRS(mapping, objectClass, rs);
	}

	/**
	 * Trandform a db resultset into an JOTModel object array
	 * @param rs
	 * @return
	 */
	protected JOTQueryResult LoadFromRS(JOTModelMapping mapping, Class objectClass, ResultSet rs) throws Exception
	{
		JOTLogger.log(JOTLogger.CAT_DB, JOTLogger.DEBUG_LEVEL, "JOTDBModel", "*** loadFromRS() ***");
		JOTQueryResult v = new JOTQueryResult();
		if (rs != null)
		{
			ResultSetMetaData meta = rs.getMetaData();
			Vector columns = new Vector();
			for (int i = 1; i <= meta.getColumnCount(); i++)
			{
				columns.add(meta.getColumnName(i));
			}
			JOTLogger.log(JOTLogger.CAT_DB, JOTLogger.DEBUG_LEVEL, "JOTDBModel", "Columns list from DB metadata: " + columns);
			while (rs.next())
			{
				JOTModel model = (JOTModel) objectClass.newInstance();
				// dealing with the 'dataId' first
				if (columns.contains("ID"))
				{
					model.setId((int) rs.getLong("ID"));
				} else
				{
					// Not good !
					throw (new Exception("Primary key missing from database !! : ID"));
				}
				// then dealing with all other user fields
				Hashtable fields = mapping.getFields();
				//fields.put("dataId",new JOTDBField("BIGINT",primaryKey));
				Enumeration e = fields.keys();
				while (e.hasMoreElements())
				{
					String javaField = (String) e.nextElement();
					JOTDBField dbField = (JOTDBField) fields.get(javaField);
					if (columns.contains(dbField.getFieldName()))
					{
						Object value = rs.getObject(dbField.getFieldName());
						Field f = model.getClass().getField(javaField);
						f.set(model, value);
					} else
					{
						JOTLogger.log(JOTLogger.CAT_DB, JOTLogger.DEBUG_LEVEL, "JOTDBModel", "Field " + dbField.getFieldName() + " was not found in the java object, ignored.");
					}
				}
				v.add(model);
			}
		}
		return v;
	}

	public void createTable(JOTTransaction transaction, JOTModelMapping mapping) throws Exception
	{
		JOTTaggedConnection con = JOTDBManager.getInstance().getConnection(mapping.getDBName());
		try
		{
			if ( ! (transaction != null && transaction.hasCreatedTable(mapping.getTableName())))
			{
				if ( ! JOTDBManager.getInstance().tableExists(mapping.getDBName(), mapping.getTableName(), false))
				{
					// we need to prevent creating the table twice when using a transaction.
					if(transaction!=null)
						transaction.addCreatedTable(mapping.getTableName());

					String columns = getColumnsDefinition(mapping);
					JOTLogger.log(JOTLogger.CAT_DB, JOTLogger.INFO_LEVEL, this, "Trying to create the table in the DB if missing)");
					JOTDBManager.getInstance().update(con, "CREATE TABLE " + mapping.getTableName() + "(" + columns + ")");
					JOTDBManager.getInstance().update(con, "ALTER TABLE " + mapping.getTableName() + " ADD PRIMARY KEY (" + "ID" + ")");
					Vector indexes = mapping.getIndexes();
					for (int i = 0; i != indexes.size(); i++)
					{
						String column = (String) indexes.get(i);
						String indexName = "IDX_" + mapping.getTableName() + "_" + column;
						JOTDBManager.getInstance().update(con, "CREATE UNIQUE INDEX " + indexName + " ON " + mapping.getTableName() + " (" + column + ")");
					}
					JOTModelMapping.writeMetaFile(mapping);
				}
			}
		} catch (Exception e)
		{
			throw (e);
		} finally
		{
			JOTDBManager.getInstance().releaseConnection(con);
		}
	}

	public void deleteTable(JOTTransaction transaction, JOTModelMapping mapping) throws Exception
	{
		JOTTaggedConnection con = JOTDBManager.getInstance().getConnection(mapping.getDBName());
		try
		{
			if (JOTDBManager.getInstance().tableExists(mapping.getDBName(), mapping.getTableName(), false))
			{
				JOTDBManager.getInstance().unCacheExitingTable(mapping.getDBName(), mapping.getTableName());
				JOTLogger.log(JOTLogger.CAT_DB, JOTLogger.INFO_LEVEL, this, "Trying to delete the table in the DB)");
				JOTDBManager.getInstance().update(con, "DROP TABLE " + mapping.getTableName());
				JOTModelMapping.deleteMetaFile(mapping);
			}
		} catch (Exception e)
		{
			throw (e);
		} finally
		{
			JOTDBManager.getInstance().releaseConnection(con);
		}
	}

	/**
	 * Creates the "column definition" string, used to create the table<br>
	 * ie:  "dataId BIGINT, name varchar(80)"
	 * @param mapping
	 * @return
	 */
	public String getColumnsDefinition(JOTModelMapping mapping)
	{
		String columns = "" + "ID" + " BIGINT NOT NULL";
		Enumeration e = mapping.getFields().elements();
		while (e.hasMoreElements())
		{
			JOTDBField field = (JOTDBField) e.nextElement();
			columns += ", ";
			columns += getColumnDefinition(field);
		}

		return columns;
	}

	public String getColumnDefinition(JOTDBField field)
	{
		String column = "" + field.getFieldName() + "";
		column += " ";
		column += field.getFieldType();
		if (field.getSize() > -1)
		{
			column += "(" + field.getSize() + ")";
		}
		return column;
	}

	/*public void delete(JOTTransaction transaction, JOTModel model) throws Exception
	{
	JOTModelMapping mapping = model.getMapping();
	JOTTaggedConnection con = getConnection(transaction, mapping);
	try
	{
	JOTSQLQueryParams params = new JOTSQLQueryParams();
	params.addCondition(new JOTSQLCondition(mapping.getPrimaryKey(), JOTSQLCondition.IS_EQUAL, new Integer((int) model.getId())));
	String deleteString = buildDeleteString(mapping, params.getConditions());
	Object[] paramValues =
	{
	new Integer((int) model.getId())
	};
	JOTDBManager.getInstance().update(con, deleteString, paramValues);
	} catch (SQLException e)
	{
	JOTLogger.logException(JOTLogger.CAT_DB, JOTLogger.ERROR_LEVEL, this, "Error", e);
	throw (e);
	} finally
	{
	if (transaction == null)
	{
	JOTDBManager.getInstance().releaseConnection(con);
	}
	}
	}*/
	/**
	 * Save/update the table in the database.
	 */
	public void save(JOTTransaction transaction, JOTModel model) throws Exception
	{
		if (model.getId() == -1)
		{
			// create
			JOTTaggedConnection con = getConnection(transaction, model.getMapping(transaction));
			try
			{
				// Should be CPT in uppercase, but dont want breaking change
				model.setId(JOTDBManager.getInstance().nextVal(con, model.getMapping(transaction).getTableName() + "_cpt"));
			} catch (SQLException e)
			{
				JOTLogger.logException(JOTLogger.CAT_DB, JOTLogger.ERROR_LEVEL, this, "Error getting NEXTVAL()", e);
				throw (e);
			} finally
			{
				if (transaction == null)
				{
					JOTDBManager.getInstance().releaseConnection(con);
				}
			}
			try
			{
				Object[] values = model.getFieldValues(model.getMapping(transaction), null);
				String[] vals = new String[values.length];
				for (int i = 0; i != vals.length; i++)
				{
					vals[i] = values[i].toString();
				}
				String[] fields = model.getMapping(transaction).getInsertFields();
				JOTQueryBuilder.insertQuery(transaction, model.getClass()).insert(fields, vals);
			} catch (SQLException e)
			{
				JOTLogger.logException(JOTLogger.CAT_DB, JOTLogger.ERROR_LEVEL, this, "Error during INSERT", e);
				throw (e);
			}
			// TODO: rollback if -1 ?
		} else
		{
			// update
			try
			{
				JOTSQLCondition cond = new JOTSQLCondition("ID", JOTSQLCondition.IS_EQUAL, new Integer((int) model.getId()));
				Object[] values = model.getFieldValues(model.getMapping(transaction), null);
				String[] fields = model.getMapping(transaction).getInsertFields();
				JOTQueryBuilder.updateQuery(transaction, model.getClass()).update(fields, values).where(cond).executeUpdate();
			} catch (SQLException e)
			{
				JOTLogger.logException(JOTLogger.CAT_DB, JOTLogger.ERROR_LEVEL, this, "Error during UPDATE", e);
				throw (e);
			}
		}
	}

	public void alterAddField(JOTTransaction transaction, JOTModelMapping mapping, JOTDBField field, Object defaultValue) throws Exception
	{
		//TODO
		throw (new UnsupportedOperationException());
	}

	private JOTTaggedConnection getConnection(JOTTransaction transaction, JOTModelMapping mapping) throws Exception
	{
		if (transaction == null)
		{
			return JOTDBManager.getInstance().getConnection(mapping.getDBName());
		} else
		{
			return transaction.getConnection();
		}
	}

	public void updateSQL(JOTTransaction transaction, JOTModelMapping mapping, String sql, Object[] params, JOTStatementFlags flags) throws Exception
	{
		JOTTaggedConnection con = getConnection(transaction, mapping);
		try
		{
			JOTDBManager.getInstance().update(con, sql, params, flags);
		} catch (SQLException e)
		{
			JOTLogger.logException(JOTLogger.CAT_DB, JOTLogger.ERROR_LEVEL, "JOTDBModel", "Error", e);
			throw (e);
		} finally
		{
			if (transaction == null)
			{
				JOTDBManager.getInstance().releaseConnection(con);
			}
		}
	}
}

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