org.snaker.engine.spring.SpringJdbcAccess.java Source code

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Here is the source code for org.snaker.engine.spring.SpringJdbcAccess.java

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/* Copyright 2012-2014 the original author or authors.
 *
 * 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 org.snaker.engine.spring;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Types;
import java.util.List;
import java.util.Map;

import javax.sql.DataSource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.snaker.engine.access.AbstractDBAccess;
import org.snaker.engine.DBAccess;
import org.snaker.engine.entity.Process;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.StatementCreatorUtils;
import org.springframework.jdbc.core.support.AbstractLobCreatingPreparedStatementCallback;
import org.springframework.jdbc.support.lob.LobCreator;
import org.springframework.jdbc.support.lob.LobHandler;

/**
 * Spring jdbc???
 * @author yuqs
 * @since 1.0
 */
public class SpringJdbcAccess extends AbstractDBAccess implements DBAccess {
    private static final Logger log = LoggerFactory.getLogger(SpringJdbcAccess.class);
    private LobHandler lobHandler;
    private JdbcTemplate template;

    public void saveProcess(final Process process) {
        super.saveProcess(process);
        if (process.getBytes() != null) {
            template.execute(PROCESS_UPDATE_BLOB, new AbstractLobCreatingPreparedStatementCallback(lobHandler) {

                protected void setValues(PreparedStatement ps, LobCreator lobCreator)
                        throws SQLException, DataAccessException {
                    try {
                        lobCreator.setBlobAsBytes(ps, 1, process.getBytes());
                        StatementCreatorUtils.setParameterValue(ps, 2, Types.VARCHAR, process.getId());
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            });
        }
    }

    public void updateProcess(final Process process) {
        super.updateProcess(process);
        if (process.getBytes() != null) {
            template.execute(PROCESS_UPDATE_BLOB, new AbstractLobCreatingPreparedStatementCallback(lobHandler) {

                protected void setValues(PreparedStatement ps, LobCreator lobCreator)
                        throws SQLException, DataAccessException {
                    try {
                        lobCreator.setBlobAsBytes(ps, 1, process.getBytes());
                        StatementCreatorUtils.setParameterValue(ps, 2, Types.VARCHAR, process.getId());
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            });
        }
    }

    public boolean isORM() {
        return false;
    }

    public void saveOrUpdate(Map<String, Object> map) {
        String sql = (String) map.get(KEY_SQL);
        Object[] args = (Object[]) map.get(KEY_ARGS);
        int[] type = (int[]) map.get(KEY_TYPE);
        if (log.isDebugEnabled()) {
            log.debug("?(Spring)=\n" + sql);
        }
        template.update(sql, args, type);
    }

    public Integer getLatestProcessVersion(String name) {
        String where = " where name = ?";
        Number number = template.queryForObject(QUERY_VERSION + where, new Object[] { name }, Integer.class);
        return (number != null ? number.intValue() : -1);
    }

    @SuppressWarnings("unchecked")
    public <T> T queryObject(Class<T> clazz, String sql, Object... args) {
        if (log.isDebugEnabled()) {
            log.debug("???=\n" + sql);
        }
        try {
            return (T) template.queryForObject(sql, args, new BeanPropertyRowMapper(clazz));
        } catch (Exception e) {
            log.error("???=\n" + e.getMessage());
            return null;
        }
    }

    @SuppressWarnings("unchecked")
    public <T> List<T> queryList(Class<T> clazz, String sql, Object... args) {
        if (log.isDebugEnabled()) {
            log.debug("??=\n" + sql);
        }
        return (List<T>) template.query(sql, args, new BeanPropertyRowMapper(clazz));
    }

    public Object queryCount(String sql, Object... args) {
        return template.queryForLong(sql, args);
    }

    public void setLobHandler(LobHandler lobHandler) {
        this.lobHandler = lobHandler;
    }

    public DataSource getDataSource() {
        return (this.template != null ? this.template.getDataSource() : null);
    }

    public void setDataSource(DataSource dataSource) {
        if (this.template == null || dataSource != this.template.getDataSource()) {
            this.template = new JdbcTemplate(dataSource);
        }
    }

    protected Connection getConnection() throws SQLException {
        return getDataSource().getConnection();
    }
}