sqlhelper类 JAVA版

/** *作者：devilishking *email： * */ package com.dal; import javax.sql.DataSource; import javax.naming.*; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.*; import java.sql.*; public abstract class SQLHelper {    /**   * 连接数据库   *   * @return   */  private static Connection getConnect() {   try {        InitialContext context = new InitialContext();    DataSource ds = (DataSource) context.lookup("java:/MSAccessDS");        return ds.getConnection();   } catch (Exception e) {    return null;   }  }    /**   * 用于执行语句（eg：insert语句，update语句，delete语句）   *   * @param String   *            cmdtext,SQL语句   * @param OracleParameter[]   *            parms,参数集合   * @return int,SQL语句影响的行数   */  public static int ExecuteNonQuery(String cmdtext, String[] parms)  throws Exception {   PreparedStatement pstmt = null;   Connection conn = null;      try {    conn = getConnect();    pstmt = conn.prepareStatement(cmdtext);    prepareCommand(pstmt, parms);        return pstmt.executeUpdate();       } catch (Exception e) {    throw new Exception("executeNonQuery方法出错:" + e.getMessage());   } finally {    try {     if (pstmt != null)      pstmt.close();     if (conn != null)      conn.close();    } catch (Exception e) {     throw new Exception("执行executeNonQuery方法出错:" + e.getMessage());    }   }  }    /**   * 用于获取结果集语句（eg：selete * from table）   *   * @param cmdtext   * @param parms   * @return ResultSet   * @throws Exception   */  public static ArrayList ExecuteReader(String cmdtext, String[] parms)  throws Exception {   PreparedStatement pstmt = null;   Connection conn = null;      try {    conn = getConnect();        pstmt = conn.prepareStatement(cmdtext);        prepareCommand(pstmt, parms);    ResultSet rs = pstmt.executeQuery();        ArrayList al = new ArrayList();    ResultSetMetaData rsmd = rs.getMetaData();    int column = rsmd.getColumnCount();        while (rs.next()) {     Object[] ob = new Object[column];     for (int i = 1; i <= column; i++) {      ob[i - 1] = rs.getObject(i);     }     al.add(ob);    }        rs.close();    return al;       } catch (Exception e) {    throw new Exception("executeSqlResultSet方法出错:" + e.getMessage());   } finally {    try {     if (pstmt != null)      pstmt.close();     if (conn != null)      conn.close();    } catch (Exception e) {     throw new Exception("executeSqlResultSet方法出错:" + e.getMessage());    }   }  }    /**   * 用于获取单字段值语句（用名字指定字段）   *   * @param cmdtext   *            SQL语句   * @param name   *            列名   * @param parms   *            OracleParameter[]   * @return Object   * @throws Exception   */  public static Object ExecuteScalar(String cmdtext, String name,    String[] parms) throws Exception {   PreparedStatement pstmt = null;   Connection conn = null;   ResultSet rs = null;      try {    conn = getConnect();        pstmt = conn.prepareStatement(cmdtext);    prepareCommand(pstmt, parms);        rs = pstmt.executeQuery();    if (rs.next()) {     return rs.getObject(name);    } else {     return null;    }   } catch (Exception e) {    throw new Exception("executeSqlObject方法出错:" + e.getMessage());   } finally {    try {     if (rs != null)      rs.close();     if (pstmt != null)      pstmt.close();     if (conn != null)      conn.close();    } catch (Exception e) {     throw new Exception("executeSqlObject方法出错:" + e.getMessage());    }   }  }    /**   * 用于获取单字段值语句（用序号指定字段）   *   * @param cmdtext   *            SQL语句   * @param index   *            列名索引   * @param parms   *            OracleParameter[]   * @return Object   * @throws Exception   */  public static Object ExecuteScalar(String cmdtext, int index, String[] parms)  throws Exception {   PreparedStatement pstmt = null;   Connection conn = null;   ResultSet rs = null;      try {    conn = getConnect();        pstmt = conn.prepareStatement(cmdtext);    prepareCommand(pstmt, parms);        rs = pstmt.executeQuery();    if (rs.next()) {     return rs.getObject(index);    } else {     return null;    }   } catch (Exception e) {    throw new Exception("executeSqlObject方法出错:" + e.getMessage());   } finally {    try {     if (rs != null)      rs.close();     if (pstmt != null)      pstmt.close();     if (conn != null)      conn.close();    } catch (Exception e) {     throw new Exception("executeSqlObject方法出错:" + e.getMessage());    }   }  }    /**   * @param pstmt   * @param cmdtext   * @param parms   *            Object[]   * @throws Exception   */  private static void prepareCommand(PreparedStatement pstmt, String[] parms)  throws Exception {   try {    if (parms != null) {     for (int i = 0; i < parms.length; i++) {      try {       pstmt.setDate(i + 1, java.sql.Date.valueOf(parms[i]));      } catch (Exception e) {       try {        pstmt        .setDouble(i + 1, Double          .parseDouble(parms[i]));       } catch (Exception e1) {        try {         pstmt.setInt(i + 1, Integer.parseInt(parms[i]));        } catch (Exception e2) {         try {          pstmt.setString(i + 1, parms[i]);         } catch (Exception e3) {          System.out          .print("SQLHelper-PrepareCommand Err1:"            + e3);         }        }       }      }     }    }   } catch (Exception e1) {    System.out.print("SQLHelper-PrepareCommand Err2:" + e1);   }  } }