日期:2014-05-17  浏览次数:20716 次

关于java web批处理再提问!
据说PreparedStatement只用预设一次,对象可多次使用,但我猜测的代码无法通过,请高手指导!
PreparedStatement psStatement = null;
String sql="insert into test (id,name)values(?,?)";
String sql1="update test set id =? where name=?"

psStatement = conn.prepareStatement(sql);

psStatement.setInt(1,3);
psStatement.setString(2,lxp);

psStatement.addBatch();  

psStatement = conn.prepareStatement(sql); //以下猜测代码
psStatement.setString(1,"hi");
psStatement.setInt(2,5);
psStatement.setString(3,xp);
psStatement.addBatch();  
psStatement.executeBatch(); 



------解决方案--------------------
psStatement = conn.prepareStatement(sql1);
这条语句不就把psStatement指向了另外一个对象了,你的第一个sql就不会存在了
下面代码供参考。
Java code

public int updateBatch(String[] sqls,String dbName) throws SQLException{
    Connection con = cdb.getConnection(dbName);
    Statement stmt = null;
    int row = 0;
    try{
        stmt = con.createStatement();
        for(int i=0;i<sqls.length;i++){
            stmt.addBatch(sqls[i]);
        }
        int rows[] = stmt.executeBatch();
        row = rows.length;
        con.commit();
        return row;
    }catch(Exception e){
        if(con!=null){
            con.rollback();
        }
        return -1;
    }finally{
        closeAll(con,null,stmt);
    }
}