JdbcDaoImpl数据操作实现和案例

JdbcDaoImpl调用jdbcTemplate实现了高效率的数据操作，目前的主流C3P0和Mybatis都是封装了这个类。

package com.cloud.storage.daoImpl;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.dao.EmptyResultDataAccessException;
import org.springframework.dao.IncorrectResultSizeDataAccessException;
import org.springframework.jdbc.core.ConnectionCallback;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.PreparedStatementCreator;
import org.springframework.jdbc.core.ResultSetExtractor;
import org.springframework.jdbc.core.StatementCallback;
import org.springframework.jdbc.support.GeneratedKeyHolder;
import org.springframework.jdbc.support.KeyHolder;
import org.springframework.jdbc.support.rowset.SqlRowSet;
import org.springframework.stereotype.Repository;

import com.cloud.storage.dao.JdbcDao;
import com.mchange.v2.c3p0.PooledDataSource;

/**
 * jdbcdao实现类
 * 
 * @author Administrator
 *
 */
@Repository
public class JdbcDaoImpl implements JdbcDao {
	@Autowired
	JdbcTemplate jdbcTemplate;

	@Override
	public String monitor() {
		StringBuffer re_value = new StringBuffer();
		re_value.append("monitor c3p0 pool ");
		DataSource ds = this.jdbcTemplate.getDataSource();
		// make sure it's a c3p0 PooledDataSource
		if (ds instanceof PooledDataSource) {
			try {
				PooledDataSource pds = (PooledDataSource) ds;
				re_value.append("\r\nnum_connections: ").append(pds.getNumConnectionsDefaultUser())
						.append("\r\nnum_busy_connections: ").append(pds.getNumBusyConnectionsDefaultUser())
						.append("\r\nnum_idle_connections: ").append(pds.getNumIdleConnectionsDefaultUser());
			} catch (SQLException e) {
				re_value.append("\r\n" + e.getMessage());
			}
		} else {
			re_value.append("\r\nNot a c3p0 PooledDataSource!");
		}
		return re_value.toString();
	}

	@Override
	public void execute(final String sql) {
		jdbcTemplate.execute(sql);
	}

	@Override
	public int delete(String sql) {
		return jdbcTemplate.update(sql);
	}

	@Override
	public int add(String sql) {
		final String sqlSave = sql.toString();
		KeyHolder keyHolder = new GeneratedKeyHolder();
		jdbcTemplate.update(new PreparedStatementCreator() {
			@Override
			public PreparedStatement createPreparedStatement(Connection con) throws SQLException {
				PreparedStatement ps = con.prepareStatement(sqlSave, Statement.RETURN_GENERATED_KEYS);
				return ps;
			}
		}, keyHolder);
		int code = keyHolder.getKey().intValue();
		return code;
	}

	@Override
	public int update(String sql) {
		return jdbcTemplate.update(sql);
	}

	@Override
	public int[] batchUpdate(String[] sql) {
		return jdbcTemplate.batchUpdate(sql);
	}

	@Override
	public List queryForList(String sql) {

		return jdbcTemplate.queryForList(sql);
	}

	@Override
	public  List queryForList(String sql, Class elementType) {
		return jdbcTemplate.queryForList(sql, elementType);
	}

	@Override
	public SqlRowSet queryForRowSet(String sql) {
		return jdbcTemplate.queryForRowSet(sql);
	}

	@Override
	public int queryForInt(String sql) {
		int re_int = 0;
		try {
			re_int = jdbcTemplate.queryForObject(sql, Integer.class);
		} catch (EmptyResultDataAccessException e) {
			re_int = 0;
		} catch (IncorrectResultSizeDataAccessException e) {
			re_int = -1;
		}
		return re_int;
	}

	@Override
	public long queryForLong(String sql) {
		return jdbcTemplate.queryForObject(sql, Long.class);
	}

	@SuppressWarnings("rawtypes")
	@Override
	public Map queryForMap(String sql) {
		return jdbcTemplate.queryForMap(sql);
	}

	@Override
	public Object queryForObject(String sql, Class requiredType) {
		Object obj = null;
		try {
			obj = jdbcTemplate.queryForObject(sql, requiredType);
		} catch (DataAccessException e) {
			obj = null;
		}
		return obj;
	}

	@SuppressWarnings({ "unchecked", "rawtypes" })
	@Override
	public int getCount(String sql) {
		return (int) jdbcTemplate.query(sql, new ResultSetExtractor() {
			@Override
			public Integer extractData(ResultSet rs) throws SQLException, DataAccessException {
				if (rs.next()) {
					return Integer.parseInt(rs.getString(1));
				} else {
					return 0;
				}
			}
		});
	}

	@Deprecated
	@Override
	public boolean executeUpdate(String sql) {
		boolean ret = true;
		try {
			jdbcTemplate.execute(sql);
		} catch (Exception e) {
			e.printStackTrace();
			ret = false;
		}
		return ret;
	}

	@SuppressWarnings({ "unchecked", "rawtypes" })
	@Override
	public int executeDelete(final String sql) {
		Integer result = 0;
		result = (Integer) jdbcTemplate.execute(new StatementCallback() {
			@Override
			public Object doInStatement(Statement statement) throws SQLException, DataAccessException {
				return statement.executeUpdate(sql);
			}

		});
		return result;
	}

	@SuppressWarnings({ "unchecked", "rawtypes" })
	@Override
	public List> getData(final String sql) {
		return (List>) jdbcTemplate.execute(new StatementCallback() {
			@Override
			public List doInStatement(Statement statement) throws SQLException, DataAccessException {
				List> result = new ArrayList>();
				ResultSet rs = statement.executeQuery(sql);
				ResultSetMetaData rsmd = rs.getMetaData();
				while (rs.next()) {
					HashMap map = new HashMap();
					for (int i = 0; i < rsmd.getColumnCount(); i++) {
						map.put(rsmd.getColumnLabel(i + 1), rs.getString(i + 1));
					}
					result.add(map);
				}
				return result;
			}

		});
	}

	@SuppressWarnings({ "unchecked", "rawtypes" })
	@Override
	public List> getScollData(final String sql, final int pageno, final int pagesize) {
		return (List>) jdbcTemplate.execute(new ConnectionCallback() {
			@Override
			public List doInConnection(Connection conn) throws SQLException, DataAccessException {
				PreparedStatement pstat = conn.prepareStatement(sql, ResultSet.TYPE_SCROLL_INSENSITIVE,
						ResultSet.CONCUR_READ_ONLY);
				List> result = new ArrayList>();
				// 最大查询的记录条数
				pstat.setMaxRows(pageno * pagesize);
				ResultSet rs = pstat.executeQuery();
				// 将游标移动到第一条记录
				rs.first();
				// 游标移动到要输出的第一条记录
				rs.relative((pageno - 1) * pagesize - 1);
				ResultSetMetaData rsmd = rs.getMetaData();
				while (rs.next()) {
					HashMap map = new HashMap();
					for (int i = 0; i < rsmd.getColumnCount(); i++) {
						map.put(rsmd.getColumnLabel(i + 1), rs.getString(i + 1));
					}
					result.add(map);
				}
				return result;
			}
		});
	}

	@Override
	public List> getObsData(String appType, String conceptDescribe, String startTime,
			String endTime, String isMq) {
		String condition = "";
		if (null != startTime && null != endTime) {
			condition = "and date(C.obsDatetime) >= '" + startTime + "' and date(C.obsDatetime) <= '" + endTime + "'";
		}
		String sql = "select B.encounterId,A.patientId,A.idcard,A.phone,A.email,A.name,C.obsDatetime,C.value,D.conceptName from patient A,#enc# B,#obs# C,concept D where A.patientId = B.patientId and B.encounterId = C.encounterId and C.conceptId = D.conceptId and D.conceptDescribe = '"
				+ conceptDescribe + "' " + condition + " and C.encounterType ='" + appType + "'";
		if (null == isMq) {
			sql = sql.replace("#enc#", "encounter");
			sql = sql.replace("#obs#", "observation");
		} else {
			sql = sql.replace("#enc#", "mqencounter");
			sql = sql.replace("#obs#", "mqobservation");
		}
		List> list = null;
		try {
			list = this.getData(sql);
		} catch (Exception e) {
			e.printStackTrace();
		}
		Map> rowData = new HashMap>();
		for (HashMap temp : list) {
			HashMap data = rowData.get(temp.get("encounterId").trim());
			if (null == data) {
				data = temp;
				rowData.put(temp.get("encounterId").trim(), data);
			}
			data.put(temp.get("conceptName").trim(), temp.get("value"));
		}
		List> result = new ArrayList>();
		for (HashMap map : rowData.values()) {
			result.add(map);
		}
		rowData = null;
		Collections.sort(result, new Comparator>() {
			@Override
			public int compare(HashMap runOne, HashMap runTwo) {
				return runTwo.get("obsDatetime").compareTo(runOne.get("obsDatetime"));
			}
		});
		return result;
	}

	@SuppressWarnings({ "unchecked", "rawtypes" })
	@Override
	public String getJson(final String sql) {
		try {
			return (String) jdbcTemplate.execute(new StatementCallback() {
				@Override
				public String doInStatement(Statement statement) throws SQLException, DataAccessException {
					StringBuffer result = new StringBuffer("[");
					ResultSet rs = statement.executeQuery(sql);
					while (rs.next()) {
						result.append("[");
						// difference 8 hours
						result.append(rs.getTimestamp(1).getTime() + 1000 * 60 * 60 * 8);
						result.append(",");
						result.append(rs.getInt(2)).append("]").append(",");
					}
					if (result.toString().endsWith(","))
						result.deleteCharAt(result.lastIndexOf(","));
					result.append("]");
					return result.toString();
				}
			});
		} catch (DataAccessException e) {
			return "日常数据查询异常!异常信息:\r\n" + e.getMessage();
		}
	}
}