MySqlHelper

package utils;

import java.io.IOException;
import java.sql.CallableStatement;
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.sql.Types;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.apache.tomcat.jdbc.pool.DataSource;
import org.apache.tomcat.jdbc.pool.PoolProperties;

/**
 * edit by lxj 2016-10-19
 * 采用tomcat7的最新数据库连接池技术进行处理参考以下网址
 * https://tomcat.apache.org/tomcat-7.0-doc/jdbc-pool.html#Introduction
 * 需要引入tomcat-juli.jar和tomcat-jdbc.jar两个包
 * @author Administrator
 *
 */
public class MySqlHelper {
    private static DataSource datasource;
    public MySqlHelper()
    {
        if(datasource==null)
        {
            Properties pro=new Properties();
            try {
                pro.load(this.getClass().getResourceAsStream("/dbinfo.properties"));
            } catch (IOException e) {
                e.printStackTrace();
            }
            String jdbcDriver=pro.getProperty("driver");
            String dbUrl=pro.getProperty("url");
            String dbUsername=pro.getProperty("userName");
            String dbPassword=pro.getProperty("password");
            PoolProperties p = new PoolProperties();
            p.setUrl(dbUrl);
            p.setDriverClassName(jdbcDriver);
            p.setUsername(dbUsername);
            p.setPassword(dbPassword);
            p.setJmxEnabled(true);
            p.setTestWhileIdle(false);
            p.setTestOnBorrow(true);
            p.setValidationQuery("SELECT 1");
            p.setTestOnReturn(false);
            p.setValidationInterval(30000);
            p.setTimeBetweenEvictionRunsMillis(30000);
            p.setMaxActive(100);
            p.setInitialSize(3);
            p.setMaxWait(10000);
            p.setRemoveAbandonedTimeout(60);
            p.setMinEvictableIdleTimeMillis(30000);
            p.setMinIdle(10);
            p.setLogAbandoned(true);
            p.setRemoveAbandoned(true);
            p.setJdbcInterceptors(
              "org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;"+
              "org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer");
            datasource = new DataSource();
            datasource.setPoolProperties(p);
        }
    }
    /**
     * 查询
     * @param sql
     * @param lo
     * @return
     */
    public List<Map<String, Object>> search(String sql, Object[] lo) {
        List<Map<String, Object>> lm = new ArrayList<Map<String, Object>>();
        Connection con = null;
        PreparedStatement ps =null;
        ResultSet rs=null;
        try {
            con = datasource.getConnection();
            ps = con.prepareStatement(sql);
            if (lo != null) {
                for (int i = 1; i <= lo.length; i++) {
                    ps.setObject(i, lo[i - 1]);
                }
            }
            rs = ps.executeQuery();
            ResultSetMetaData rm = rs.getMetaData();
            int cont = rm.getColumnCount();
            while (rs.next()) {
                Map<String, Object> mp = new HashMap<String, Object>();
                for (int c = 1; c <= cont; c++) {
                    Object o = rs.getObject(c);
                    mp.put(rm.getColumnName(c), o == null ? "" : o);
                }
                lm.add(mp);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        finally {
            if (rs!=null) try {rs.close();}catch (Exception ex) {}
            if (ps!=null) try {ps.close();}catch (Exception ex) {}
            if (con!=null) try {con.close();}catch (Exception ex) {}
        }
        return lm;
    }

    /**
     * 保存和修改和删除
     * @param sql
     * @param lo
     * @return
     */
    public int saveorupdate(String sql, Object[] lo) {
        int p = 0;
        Connection con = null;
        PreparedStatement ps =null;
        try {
            con = datasource.getConnection();
            ps = con.prepareStatement(sql);
            if (lo != null) {
                for (int i = 1; i <= lo.length; i++) {
                    ps.setObject(i, lo[i - 1]);
                }
            }
            p = ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        finally {
            if (ps!=null) try {ps.close();}catch (Exception ex) {}
            if (con!=null) try {con.close();}catch (Exception ex) {}
        }
        return p;
    }

    /**
     * 获取分页数据
     * @param sqlmodel 查询模型
     * @return
     */
    public static List<Map<String, Object>> GetPageList(Model.Sql_PageList sqlmodel) {
        List<Map<String, Object>> lm = new ArrayList<Map<String, Object>>();
        Connection con = null;
        ResultSet rs = null;
        CallableStatement Callstmt=null;
        try {
            con = datasource.getConnection();
            Callstmt = con.prepareCall("{call PageList(?,?,?,?,?,?,?,?)}");
            Callstmt.setString("_fields", sqlmodel.getStrFieldShow());
            Callstmt.setString("_tables", sqlmodel.getStrTableName());
            Callstmt.setString("_where", sqlmodel.getStrWhere());
            Callstmt.setString("_orderby", sqlmodel.getStrFieldOrder());
            Callstmt.setInt("_pageindex", sqlmodel.getPageCurrent());
            Callstmt.setInt("_pagesize", sqlmodel.getPageSize());
            Callstmt.registerOutParameter("_totalcount",java.sql.Types.INTEGER);
            Callstmt.registerOutParameter("_pagecount",java.sql.Types.INTEGER);
            Callstmt.executeQuery();
            rs = Callstmt.executeQuery();
            int totalcount = Callstmt.getInt("_totalcount");
            int pagecount = Callstmt.getInt("_pagecount");

            sqlmodel.setInfoCount(totalcount);
            sqlmodel.setPageCount(pagecount);
            ResultSetMetaData rm = rs.getMetaData();
            int cont = rm.getColumnCount();
            while (rs.next()) {
                Map<String, Object> mp = new HashMap<String, Object>();
                for (int c = 1; c <= cont; c++) {
                    Object o = rs.getObject(c);
                    mp.put(rm.getColumnName(c), o == null ? "" : o);
                }
                lm.add(mp);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (rs!=null) try {rs.close();}catch (Exception ex) {}
            if (Callstmt!=null) try {Callstmt.close();}catch (Exception ex) {}
            if (con!=null) try {con.close();}catch (Exception ex) {}
        }
        return lm;
    }
}