package it.cast.jdbc;

 import java.sql.Connection;

 import java.sql.ParameterMetaData;

 import java.sql.PreparedStatement;

 import java.sql.ResultSet;

 import java.sql.ResultSetMetaData;

 import java.sql.SQLException;

 import java.util.HashMap;

 import java.util.Map;

 public class ResultSetMetaTest {

     public static void main(String[] args) throws SQLException {

         Map<String,Object> map = read("select * from user where id=2");

         System.out.println(map);

     }

     static Map<String, Object> read(String sql) throws SQLException {

         Connection conn = null;

         PreparedStatement ps = null;

         ResultSet rs = null;

         try {

             conn = jdbcUtils.getConnection();

             ps = conn.prepareStatement(sql);

             rs = ps.executeQuery();

             ResultSetMetaData rsmd = rs.getMetaData();

             // 得出有多少列

             int count = rsmd.getColumnCount();

             String[] colNames = new String[count];

             for (int i = 1; i <= count; i++) {

                 // System.out.print(rsmd.getColumnClassName(i)+"\t");

                 // System.out.print(rsmd.getColumnName(i)+"\t");

                 // System.out.println(rsmd.getColumnLabel(i)+"\t");

                 colNames[i-1] = rsmd.getColumnName(i);

             }

             Map<String, Object> data = null;

             while (rs.next()) {

                 data = new HashMap<String, Object>();

                 for (int j = 0; j < colNames.length; j++) {

                     data.put(colNames[j], rs.getObject(colNames[j]));

                 }

             }

             return data;

         } finally {

             jdbcUtils.free(rs, ps, conn);

         }

     }

 }