一个jdbc的封装类有问题，不知如何解决
public List getResult(ResultSet rs, Class cls) {
List coll = new ArrayList(); try { Method[] method = cls.getMethods();
Field[] field = cls.getFields(); //这里可以是xml文件对应值 int count = rs.getMetaData().getColumnCount();
int types[] = new int[count];
String keys[] = new String[count];
for (int i = 0; i < count; i++) {
keys[i] = rs.getMetaData().getColumnName(i); //这里出现问题
types[i] = rs.getMetaData().getColumnType(i);
} while (rs.next()) {
Object obj = cls.newInstance();
//通过反射得到o的所有字段!
for (int j = 0; j < count; j++) {
for (int i = 0; i < method.length; i++) {
//if ("set".equals(method[i].getName().substring(0, 2))) {
//key.substring(0,1).toUpperCase();
if (method[i].getName().equals("set" + keys[j])) {
//Class[] types = method[i].getParameterTypes();
if (types[i] == Types.CHAR ||
types[i] == Types.VARCHAR) {
method[i].invoke(obj,
new Object[] {rs.getString(i)});
}
if (types[i] == Types.DATE) {
method[i].invoke(obj,
new Object[] {rs.getDate(i)});
}
if (types[i] == Types.DOUBLE) {
method[i].invoke(obj,
new Object[] {Double.valueOf(i)});
}
if (types[i] == Types.FLOAT) {
method[i].invoke(obj,
new Object[] {Float.valueOf(i)});
}
if (types[i] == Types.BOOLEAN) {
method[i].invoke(obj,
new Object[] {Boolean.
valueOf(rs.getBoolean(i))});
}
if (types[i] == Types.INTEGER) {
method[i].invoke(obj,
new Object[] {Integer.
valueOf(rs.getInt(i))});
}
}
}
// }
}
//String value = rs.getString();
}
}catch (Exception e) {
e.printStackTrace();
}
return coll;错误信息:
com.microsoft.sqlserver.jdbc.SQLServerException: 索引 0 超出范围。
public List getResult(ResultSet rs, Class cls) {
List coll = new ArrayList(); try { Method[] method = cls.getMethods();
Field[] field = cls.getFields(); //这里可以是xml文件对应值 int count = rs.getMetaData().getColumnCount();
int types[] = new int[count];
String keys[] = new String[count];
for (int i = 0; i < count; i++) {
keys[i] = rs.getMetaData().getColumnName(i); //这里出现问题
types[i] = rs.getMetaData().getColumnType(i);
} while (rs.next()) {
Object obj = cls.newInstance();
//通过反射得到o的所有字段!
for (int j = 0; j < count; j++) {
for (int i = 0; i < method.length; i++) {
//if ("set".equals(method[i].getName().substring(0, 2))) {
//key.substring(0,1).toUpperCase();
if (method[i].getName().equals("set" + keys[j])) {
//Class[] types = method[i].getParameterTypes();
if (types[i] == Types.CHAR ||
types[i] == Types.VARCHAR) {
method[i].invoke(obj,
new Object[] {rs.getString(i)});
}
if (types[i] == Types.DATE) {
method[i].invoke(obj,
new Object[] {rs.getDate(i)});
}
if (types[i] == Types.DOUBLE) {
method[i].invoke(obj,
new Object[] {Double.valueOf(i)});
}
if (types[i] == Types.FLOAT) {
method[i].invoke(obj,
new Object[] {Float.valueOf(i)});
}
if (types[i] == Types.BOOLEAN) {
method[i].invoke(obj,
new Object[] {Boolean.
valueOf(rs.getBoolean(i))});
}
if (types[i] == Types.INTEGER) {
method[i].invoke(obj,
new Object[] {Integer.
valueOf(rs.getInt(i))});
}
}
}
// }
}
//String value = rs.getString();
}
}catch (Exception e) {
e.printStackTrace();
}
return coll;错误信息:
com.microsoft.sqlserver.jdbc.SQLServerException: 索引 0 超出范围。
从1开始。
example:
# public List getResultDataList(String sql, Connection con) {
# List<Map> dataList = new ArrayList<Map>();
# Map<String, String> map = new HashMap<String, String>();//存放对应字段数据
# PreparedStatement ps = null;
# ResultSet ds = null;
# ResultSetMetaData rsd;
# try {
# ps = con.prepareStatement(sql);
# ds = ps.executeQuery();
# while (ds.next()) {
# map = new HashMap<String, String>();//通过键值对存放一条记录的数据
# rsd = ds.getMetaData();
# for (int i = 1; i <= rsd.getColumnCount(); i++) {
# switch (rsd.getColumnType(i)) {//通过判断数据类型转换数据
# case 12:// varchar(12)
# map.put(rsd.getColumnName(i), ds.getString(i));
# break;
# case 1:// char(1)
# map.put(rsd.getColumnName(i), ds.getString(i));
# break;
# case -7:// bit(-7)
# map.put(rsd.getColumnName(i), Boolean.toString(ds
# .getBoolean(i)));
# break;
# case 4:// int(4)
# map.put(rsd.getColumnName(i), Integer.toString(ds
# .getInt(i)));
# break;
# case 5:// smallint(5)
# map.put(rsd.getColumnName(i), Integer.toString(ds
# .getInt(i)));
# break;
# case 93:// datetime(93)
# if (ds.getString(i) == null)
# map.put(rsd.getColumnName(i), "");
# else {
# if (ds.getString(i).length() >= 19) {
# map.put(rsd.getColumnName(i), ds.getString(i)
# .substring(0, 19));
# } else {
# map.put(rsd.getColumnName(i), ds.getString(i)
# .substring(0, 10));
# }
# }
# break;
# case 3:// decimal(3)
# map.put(rsd.getColumnName(i), Double.toString(ds
# .getDouble(i)));
# break;
# default:
# map.put(rsd.getColumnName(i), ds.getString(i));
# break;
# }
# }
# dataList.add( map);//存放所有行数据
# }
# } catch (SQLException e) {
# e.printStackTrace();
# throw new RuntimeException(e);
# } finally {
# connection是通过HibernateDaoSupport获取得到的，似乎能够自动回收（反回到连接池），是否真的不用关闭连接呢？
# /*
# * try{ if(ds!=null){ds.close();ds=null;}
# * if(ps!=null){ps.close();ps=null;}
# * if(con!=null){con.close();con=null;} }catch(SQLException e){}
# */
# }
# return dataList;
# }