org.netxilia.spi.impl.storage.db.sql.DefaultConnectionWrapper.java Source code

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Here is the source code for org.netxilia.spi.impl.storage.db.sql.DefaultConnectionWrapper.java

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/*******************************************************************************
 * 
 * Copyright 2010 Alexandru Craciun, and individual contributors as indicated
 * by the @authors tag. 
 * 
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 * 
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 ******************************************************************************/
package org.netxilia.spi.impl.storage.db.sql;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import org.apache.commons.lang.ArrayUtils;
import org.netxilia.api.exception.StorageException;

/**
 * This is a default implementation of the wrapper around a connection.
 * 
 * @author <a href='mailto:ax.craciun@gmail.com'>Alexandru Craciun</a>
 * 
 */
public class DefaultConnectionWrapper implements IConnectionWrapper {
    private static org.apache.log4j.Logger log = org.apache.log4j.Logger.getLogger(DefaultConnectionWrapper.class);

    private final Connection connection;

    DefaultConnectionWrapper(Connection connection) {
        this.connection = connection;
    }

    public <T> List<T> query(String sql, RowMapper<T> rowMapper, Object... params) {
        PreparedStatement st = null;
        ResultSet rs = null;

        if (log.isDebugEnabled()) {
            log.debug("QUERY:" + sql + " with " + ArrayUtils.toString(params));
        }
        try {
            st = connection.prepareStatement(sql);
            for (int i = 0; i < params.length; ++i) {
                st.setObject(i + 1, params[i]);
            }
            rs = st.executeQuery();
            return new RowMapperResultSetExtractor<T>(rowMapper).extractData(rs);
        } catch (SQLException e) {
            throw new StorageException(e);
        } finally {
            if (rs != null) {
                try {
                    rs.close();
                } catch (SQLException e) {
                    // silent
                }
            }
            if (st != null) {
                try {
                    st.close();
                } catch (SQLException e) {
                    // silent
                }
            }
        }

    }

    public int queryForInt(String sql, Object... params) {
        PreparedStatement st = null;
        ResultSet rs = null;
        if (log.isDebugEnabled()) {
            log.debug("QUERY INT:" + sql + " with " + ArrayUtils.toString(params));
        }
        try {
            st = connection.prepareStatement(sql);
            for (int i = 0; i < params.length; ++i) {
                st.setObject(i + 1, params[i]);
            }
            rs = st.executeQuery();
            if (rs.next()) {
                return rs.getInt(1);
            }
            return 0;
        } catch (SQLException e) {
            throw new StorageException(e);
        } finally {
            if (rs != null) {
                try {
                    rs.close();
                } catch (SQLException e) {
                    // silent
                }
            }
            if (st != null) {
                try {
                    st.close();
                } catch (SQLException e) {
                    // silent
                }
            }
        }
    }

    public int update(String sql, Object... params) {
        PreparedStatement st = null;

        long t1 = System.currentTimeMillis();

        try {
            st = connection.prepareStatement(sql);
            for (int i = 0; i < params.length; ++i) {
                st.setObject(i + 1, params[i]);
            }
            return st.executeUpdate();
        } catch (SQLException e) {
            throw new StorageException(e);
        } finally {
            if (st != null) {
                try {
                    st.close();
                } catch (SQLException e) {
                    // silent
                }
            }
            long t2 = System.currentTimeMillis();
            if (log.isDebugEnabled()) {
                log.debug("UPDATE:" + sql + " with " + ArrayUtils.toString(params) + " update:" + (t2 - t1));
            }
        }
    }

    @Override
    public void close() {
        try {
            connection.commit();
            connection.close();
        } catch (SQLException e) {
            // silent
        }
    }

}