参数的元数据信息&数据库的元数据信息

 package it.cast.jdbc;

 import java.sql.Connection;
 import java.sql.DatabaseMetaData;
 import java.sql.Date;
 import java.sql.ParameterMetaData;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;

 public class OtherAPI {

     public static void main(String[] args) throws SQLException {
         Object[] params = new Object[] { "zero",new Date(System.currentTimeMillis()),100f };
         ParameterMetaTest(
                 "select * from user where name=? and birthday<? and money>? ",
                 params );
     }

     static void read() throws SQLException {
         Connection conn = null;
         Statement st = null;
         ResultSet rs = null;

         try {
             conn = jdbcUtils.getConnection();

             st = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
                     ResultSet.CONCUR_UPDATABLE);

             rs = st
                     .executeQuery("select id,name,money,birthday from user where id<5");

             while (rs.next()) {
                 System.out.println(rs.getObject("id") + "/t"
                         + rs.getObject("name") + "/t"
                         + rs.getObject("birthday") + "/t");

                 String name = rs.getString("name");
                 if ("lisi".equals(name)) {
                     rs.updateFloat("money", 3000f);
                     rs.updateRow();
                 }
             }
         } finally {
             jdbcUtils.free(rs, st, conn);
         }
     }

     static void DBMD() throws SQLException {
         Connection conn = jdbcUtils.getConnection();
         DatabaseMetaData dbmd = conn.getMetaData();

         System.out.println("db name:" + dbmd.getDatabaseProductName());
         System.out.println("tx:" + dbmd.supportsTransactions());

         conn.close();
     }

     static void ParameterMetaTest(String sql, Object[] params)
             throws SQLException {

         Connection conn = null;
         PreparedStatement ps = null;
         ResultSet rs = null;

         try {
             conn = jdbcUtils.getConnection();
             ps = conn.prepareStatement(sql);

             ParameterMetaData pmd = ps.getParameterMetaData();
             int count = pmd.getParameterCount();

             for (int i = 1; i <= count; i++) {
                 // System.out.println(pmd.getParameterClassName(i)+"\t");
                 // System.out.println(pmd.getParameterType(i)+"\t");
                 // System.out.println(pmd.getParameterTypeName(i)+"\t");
                 ps.setObject(i, params[i - 1]);
             }
             rs = ps.executeQuery();
             while (rs.next()) {
                 System.out.println(rs.getObject("id") + "\t"
                         + rs.getObject("name") + "\t"
                         + rs.getObject("birthday") + "\t");
             }

         } finally {
             jdbcUtils.free(rs, ps, conn);
         }
     }

 }

OtherAPI

 package it.cast.jdbc;

 import java.sql.CallableStatement;
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;

 public class jdbcUtils {

     private static String url = "jdbc:mysql://localhost:3306/jdbc?generateSimpleParameterMetadata=true";
     private static String user = "root";
     private static String password = "123";

     private jdbcUtils() {

     }

     static {
         try {
             Class.forName("com.mysql.jdbc.Driver");
         } catch (ClassNotFoundException e) {
             e.printStackTrace();
         }
     }

     public static Connection getConnection() throws SQLException {
         return DriverManager.getConnection(url, user, password);
     }

     public static void free(ResultSet rs, Statement st, Connection conn) {

         try {
             if (rs != null)
                 rs.close();
         } catch (SQLException e) {
             e.printStackTrace();
         } finally {

             try {
                 if (st != null)
                     st.close();
             } catch (SQLException e) {
                 e.printStackTrace();
             } finally {

                 try {
                     if (conn != null)
                         conn.close();
                 } catch (SQLException e) {
                     e.printStackTrace();
                 }
             }

         }

     }

     public static void free(ResultSet rs, PreparedStatement ps, Connection conn) {

         try {
             if (rs != null)
                 rs.close();
         } catch (SQLException e) {
             e.printStackTrace();
         } finally {

             try {
                 if (ps != null)
                     ps.close();
             } catch (SQLException e) {
                 e.printStackTrace();
             } finally {

                 try {
                     if (conn != null)
                         conn.close();
                 } catch (SQLException e) {
                     e.printStackTrace();
                 }
             }

         }

     }
     public static void free(ResultSet rs, CallableStatement cs, Connection conn) {

         try {
             if (rs != null)
                 rs.close();
         } catch (SQLException e) {
             e.printStackTrace();
         } finally {

             try {
                 if (cs != null)
                     cs.close();
             } catch (SQLException e) {
                 e.printStackTrace();
             } finally {

                 try {
                     if (conn != null)
                         conn.close();
                 } catch (SQLException e) {
                     e.printStackTrace();
                 }
             }

         }

     }
 }

jdbcUtils