Hero King — Wed, 04 Jan 2006 03:15:00 GMT

��介：该框架吸取IBatis设计思想和方法映��机�Ӟ��l�合模式匚w��Q�将查询�l�果直接映射成域对象模型�Q��ƈ支持分页�?BR> 代码如下�Q?BR>package heroking.db;

import java.util.List;
import java.util.ArrayList;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.sql.*;

public class GeneralDao {
private Connection connection = null;

    public Connection getConnection() {
        return connection;
    }

    public void setConnection(Connection connection) {
        this.connection = connection;
    }

    /**
     * 执行插入�Q�更斎ͼ�删除操作�Q�返回��gؓ影响记录数�?BR>     * @param sql
     * @param parameter
     */
    public int executeUpdate(String sql, Object parameter) {
        List result = new ArrayList();
        //按模式匹配�{换sql语句
        Pattern pattern = Pattern.compile("#[a-zA-Z]+#");   //模式匚w��
        Matcher matcher = pattern.matcher(sql);
        String formatSql = matcher.replaceAll("?");
        //�q�接数据�?BR>        PreparedStatement st = null;
        try {
            st = connection.prepareStatement(formatSql);
        } catch (Exception e) {
            e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
        }
        //��d��预处理参�?BR>        int i = 1;
        while (matcher.find()) {
            String field = matcher.group();
            String formatField = field.substring(1, field.length() - 1);
            try {
                st.setObject(i++, DataBaseUtil.excuteGetMethod(formatField, parameter));
            } catch (SQLException e) {
                e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
            }
        }
        try {
            return st.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
        }
        return 0;
    }

    /**
     * 查询�W�pageCount��面�Q�每个页面的记录��CؓpageSize�Q�的�l�果
     * @param sql   sql查询
     * @param parameter 参数对象
     * @param pageSize ��面�l�果集大��?BR>     * @param pageCount ��面�?BR>     * @param resultClass �l�果�c?BR>     * @return List
     */
    public List executeQuerys(String sql, Object parameter, int pageSize, int pageCount, Class resultClass){
        List result = new ArrayList();
        //按模式匹配�{换sql语句
        Pattern pattern = Pattern.compile("#[a-zA-Z]+#");   //模式匚w��
        Matcher matcher = pattern.matcher(sql);
        String formatSql = matcher.replaceAll("?");
        //�q�接数据�?BR>        PreparedStatement st = null;
        try {
            //讄��预处理状态参敎ͼ�滚动�Q�只诅R�?BR>            st = connection.prepareStatement(formatSql, ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
        } catch (Exception e) {
            e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
        }
        //��d��预处理参�?BR>        int i = 1;
        while (matcher.find()) {
            String field = matcher.group();
            String formatField = field.substring(1, field.length() - 1);
            try {
                st.setObject(i++, DataBaseUtil.excuteGetMethod(formatField, parameter));
            } catch (SQLException e) {
                e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
            }
        }
        ResultSet rs = null;
        try {
            rs = st.executeQuery();
            //获取总记录数
            rs.last();
            int totalCount = rs.getRow();

            //当前��面�W�一条记录位�|?BR>            int curPagePosition = (pageCount -1)*pageSize + 1;
            if (totalCount < curPagePosition) {
                return null;
            }
            rs.beforeFirst();
            rs.absolute(curPagePosition);

            //��装值对�?BR>            int k = 0;
            ResultSetMetaData rsmd = rs.getMetaData();
            int cols = rsmd.getColumnCount();
            while (rs.next() && k < pageSize) {
                Object o = resultClass.newInstance();
                for (int j = 1; j <= cols; j++) {
                    String name = rsmd.getColumnName(j);
                    Object value = rs.getObject(j);//作通用�c�d��处理,�q�样row中的�c�d��都是Object型的�?BR>                    String voName = DataBaseUtil.toInValueName(name);
                    DataBaseUtil.executeSetMethod(voName, value, o);
                }
                result.add(o);
                k++;    //获取数加1
            }
        } catch (SQLException e) {
            e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
        } catch (IllegalAccessException e) {
            e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
        } catch (InstantiationException e) {
            e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
        }
        return result;
    }
    /**
     * 查询所有纪�?BR>     * @param sql
     * @param parameter
     * @param resultClass
     * @return List
     */
    public List executeQuerys(String sql, Object parameter, Class resultClass){
        //默认为所有记�?BR>        return this.executeQuerys(sql, parameter, Integer.MAX_VALUE, 1, resultClass);
    }

    /**
     * 查询单个记录
     * @param sql
     * @param parameter
     * @param resultClass
     * @return Object
     */
    public Object executeQuery(String sql, Object parameter, Class resultClass){
        List list = executeQuerys(sql, parameter,resultClass);
        if (list == null || list.size() == 0) {
            return null;
        }
        return list.get(0);
    }
}

Hero King 2006-01-04 11:15 发表评论

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