java读取数据库表信息，子段

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

/***

 *  2014-07-21日：

 *  oracle数据库， 表结构查询 ，字段信息查询，字段注释查询 

 *  表字段查询 all_tab_columns

 *  表字段注释查询 all_col_comments

 *  @author 王华荣

 * 

 */

public class OracleTable {

    private static final String DRIVER_CLASS = "oracle.jdbc.driver.OracleDriver";

    private static final String DATABASE_URL = "jdbc:oracle:thin:@192.168.1.10:1521:orcl";

    private static final String DATABASE_USER = "dev";

    private static final String DATABASE_PASSWORD = "dev";

    private static Connection con = null;

     

    public static Connection getConnection() {

        try {

            Class.forName(DRIVER_CLASS);

            con=DriverManager.getConnection(DATABASE_URL,DATABASE_USER,DATABASE_PASSWORD);

            return con;

        } catch (Exception ex) {

            System.out.println("2:"+ex.getMessage());

        }

        return con;

    }

     

    /***

     * 打印test

     * @throws SQLException

     */

    public static void sysoutStrTablePdmCloumns(String Table,String Owner) throws SQLException{

        getConnection();

         

        List<HashMap<String,String>> columns = new ArrayList<HashMap<String,String>>();

         

        try{

            Statement stmt = con.createStatement();

             

            String sql=

             "select "+

             "         comments as \"Name\","+

             "         a.column_name \"Code\","+

             "         a.DATA_TYPE as \"DataType\","+

             "         b.comments as \"Comment\","+

             "         decode(c.column_name,null,'FALSE','TRUE') as \"Primary\","+

             "         decode(a.NULLABLE,'N','TRUE','Y','FALSE','') as \"Mandatory\","+

             "         '' \"sequence\""+

             "   from "+

             "       all_tab_columns a, "+

             "       all_col_comments b,"+

             "       ("+

             "        select a.constraint_name, a.column_name"+

             "          from user_cons_columns a, user_constraints b"+

             "         where a.constraint_name = b.constraint_name"+

             "               and b.constraint_type = 'P'"+

             "               and a.table_name = '"+Table+"'"+

             "       ) c"+

             "   where "+

             "     a.Table_Name=b.table_Name "+

             "     and a.column_name=b.column_name"+

             "     and a.Table_Name='"+Table+"'"+

             "     and a.owner=b.owner "+

             "     and a.owner='"+Owner+"'"+

             "     and a.COLUMN_NAME = c.column_name(+)" +

             "  order by a.COLUMN_ID";

            System.out.println(sql);

            ResultSet rs = stmt.executeQuery(sql);

            while (rs.next()){

                HashMap<String,String> map = new HashMap<String,String>();

                map.put("Name", rs.getString("Name"));

                map.put("Code", rs.getString("Code"));

                map.put("DataType", rs.getString("DataType"));

                map.put("Comment", rs.getString("Comment"));

                map.put("Primary", rs.getString("Primary"));

                map.put("Mandatory", rs.getString("Mandatory"));

                columns.add(map);

            }

        }

        catch (SQLException e){

            e.printStackTrace();

        }finally{

            con.close();

        }

    }

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

         

        sysoutStrTablePdmCloumns("CT_INFO_CONTRACT_BORROW","DEV");

         

         

    }

     

}

test

java获取数据库里表的名字



博客分类： java

 

一.Java方法 

// 得到当前数据库下所有的表名 

Java代码  收藏代码

public void getTableNameByCon(Connection con) {  

   try {  

   DatabaseMetaData meta = con.getMetaData();  

   ResultSet rs = meta.getTables(null, null, null,  

     new String[] { "TABLE" });  

   while (rs.next()) {  

     System.out.println("表名：" + rs.getString(3));  

     System.out.println("表所属用户名：" + rs.getString(2));  

     System.out.println("------------------------------");  

   }  

   con.close();  

   } catch (Exception e) {  

   try {  

     con.close();  

   } catch (SQLException e1) {  

     // TODO Auto-generated catch block  

     e1.printStackTrace();  

   }  

   // TODO Auto-generated catch block  

   e.printStackTrace();  

   }  

}  

二.通过sql语句得到数据库里所有的表名 

--MySQL数据库 

Java代码  收藏代码

show tables;  

--Oracle数据库（当前登录用户下的表） 

Java代码  收藏代码

select uo.object_name from user_objects uo where uo.object_type = 'TABLE';  

--sql server 2000/2005数据库 

Java代码  收藏代码

select name from sysobjects  

--sybase数据库 

Java代码  收藏代码

select name from sysobjects where type='U';  

--DB2数据库  



Java代码  收藏代码

select tabname from syscat.tables where tabschema = current schema ;//   

获取当前模式下面的所有用户表 



转自:http://hi.baidu.com/rybwxn/blog/item/1a59502a75a7de25d52af1cc.html 

test

 

首先是DatabaseMetaData接口:



public static void main(String[] args) {   

           

        //这里没有指定数据库   

        String url = "jdbc:mysql://127.0.0.1:3306/";   

        String user = "root";   

        String pass = "";   

        try {   

  

            Class.forName("com.mysql.jdbc.Driver").newInstance();   

            Connection conn = DriverManager.getConnection(url, user, pass);   

            DatabaseMetaData metadata = conn.getMetaData();   

            System.out.println("数据库已知的用户: "+ metadata.getUserName());   

            System.out.println("数据库的系统函数的逗号分隔列表: "+ metadata.getSystemFunctions());   

            System.out.println("数据库的时间和日期函数的逗号分隔列表: "+ metadata.getTimeDateFunctions());   

            System.out.println("数据库的字符串函数的逗号分隔列表: "+ metadata.getStringFunctions());   

            System.out.println("数据库供应商用于 'schema' 的首选术语: "+ metadata.getSchemaTerm());   

            System.out.println("数据库URL: " + metadata.getURL());   

            System.out.println("是否允许只读:" + metadata.isReadOnly());   

            System.out.println("数据库的产品名称:" + metadata.getDatabaseProductName());   

            System.out.println("数据库的版本:" + metadata.getDatabaseProductVersion());   

            System.out.println("驱动程序的名称:" + metadata.getDriverName());   

            System.out.println("驱动程序的版本:" + metadata.getDriverVersion());   

               

            System.out.println();   

            System.out.println("数据库中使用的表类型");   

            ResultSet rs = metadata.getTableTypes();   

            while (rs.next()) {   

                System.out.println(rs.getString(1));   

            }   

            rs.close();   

               

            System.out.println();   

            /**  

             * 获取指定的数据库的所有表的类型,getTables()的第一个参数就是数据库名  

             * 因为与MySQL连接时没有指定,这里加上,剩下的参数就可以为null了  

             * 第二个参数是模式名称的模式,但是输出也是什么都没有。谁知道告诉我一声  

             */  

            System.out.println("获取指定的数据库的所有表的类型");   

            ResultSet rs1 = metadata.getTables("ssi2bbs", null, null, null);   

            while (rs1.next()) {   

                System.out.println();   

                System.out.println("数据库名:"+ rs1.getString(1));   

                System.out.println("表名: "+rs1.getString(3));   

                System.out.println("类型: "+rs1.getString(4));   

            }   

            rs1.close();   

               

            System.out.println();   

            System.out.println("获取指定的数据库的表的主键");   

            //获取指定的数据库的表的主键，第二个参数也是模式名称的模式,使用null了   

            ResultSet rs2 = metadata.getPrimaryKeys("mysql", null, "db");   

            while (rs2.next()) {   

                System.out.println("主键名称: "+ rs2.getString(4));   

            }   

            rs2.close();   

               

            System.out.println();   

            System.out.println("DatabaseMetaData.getIndexInfo()方法返回信息:");   

            ResultSet rs3 = metadata.getIndexInfo("ssi2bbs", null, "user", false, true);   

            while (rs3.next()) {   

                System.out.println("数据库名: "+ rs3.getString(1));   

                System.out.println("表模式: "+ rs3.getString(2));   

                System.out.println("表名称: "+ rs3.getString(3));   

                System.out.println("索引值是否可以不唯一: "+ rs3.getString(4));   

                System.out.println("索引类别: "+ rs3.getString(5));   

                System.out.println("索引名称: "+ rs3.getString(6));   

                System.out.println("索引类型: "+ rs3.getString(7));   

                System.out.println("索引中的列序列号: "+ rs3.getString(8));   

                System.out.println("列名称: "+ rs3.getString(9));   

                System.out.println("列排序序列: "+ rs3.getString(10));   

                System.out.println("TYPE为 tableIndexStatistic时它是表中的行数否则它是索引中唯一值的数量: "+ rs3.getString(11));   

                System.out.println("TYPE为 tableIndexStatisic时它是用于表的页数否则它是用于当前索引的页数: "+ rs3.getString(12));   

                System.out.println("过滤器条件: "+ rs3.getString(13));   

            }   

            rs3.close();   

               

        } catch (Exception e) {   

            e.printStackTrace();   

        }   

    }  

 ResultSetMetaData接口, 用于获取关于ResultSet 对象中列的类型和属性信息的对象。下面的代码是把一个表的列信息打印了出来。当然了，这只是一部分。详细的参考JAVA JDK。



public static void main(String[] args) {   

        try {   

            Class.forName("com.mysql.jdbc.Driver").newInstance();   

            Connection conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/ssi2bbs","root","");   

            PreparedStatement ps = conn.prepareStatement("select * from bbs");   

            ResultSet rs = ps.executeQuery();   

            ResultSetMetaData rsme = rs.getMetaData();   

               

            int columnCount = rsme.getColumnCount();   

            System.out.println("ResultSet对象中的列数"+ columnCount);   

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

                System.out.println();   

                System.out.println("列名称: "+ rsme.getColumnName(i));   

                System.out.println("列类型(DB): " + rsme.getColumnTypeName(i));   

                System.out.println("长度: "+ rsme.getPrecision(i) );   

                System.out.println("是否自动编号: "+ rsme.isAutoIncrement(i));   

                System.out.println("是否可以为空: "+ rsme.isNullable(i));   

                System.out.println("是否可以写入: "+ rsme.isReadOnly(i));   

            }   

               

        } catch (Exception e) {   

            e.printStackTrace();   

        }   

           

    }  

test