JDBC通用方法实现

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import java.util.UUID;

import javax.naming.Context;
import javax.naming.InitialContext;

public class TestDatasource {

    final static String INITIAL_CONTEXT_FACTORY = "weblogic.jndi.WLInitialContextFactory";
    final static String PROVIDER_URL = "t3://10.111.131.53:7001";
    final static String JNDI = "my_jdbc";
     /** 
     * 数据库驱动类名称 
     */  
    private static final String DRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";  
  
    /** 
     * 连接字符串 
     */  
    private static final String URLSTR = "jdbc:sqlserver://localhost:1433; databaseName=test";  
  
    /** 
     * 用户名 
     */  
    private static final String USERNAME = "admin";  
  
    /** 
     * 密码 
     */  
    private static final String USERPASSWORD = "111111";  
       /** 
     * 创建CallableStatement对象 
     */  
    private CallableStatement callableStatement = null;  
     /** 
     * 创建数据库连接对象 
     */  
    private Connection connnection = null;  
  
    /** 
     * 创建PreparedStatement对象 
     */  
    private PreparedStatement preparedStatement = null;  
    /** 
     * 创建结果集对象 
     */  
    private ResultSet resultSet = null;  
    
    static Context _ctx = null;
    
    static {
        //通过jndi
        Hashtable<String, String> ht = new Hashtable<String, String>();
        ht.put(Context.INITIAL_CONTEXT_FACTORY, INITIAL_CONTEXT_FACTORY);
        ht.put(Context.PROVIDER_URL, PROVIDER_URL);
        try {
            _ctx = new InitialContext(ht);
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        //通过加载驱动
         try {  
                // 加载数据库驱动程序  
                Class.forName(DRIVER);  
            } catch (ClassNotFoundException e) {  
                System.out.println("加载驱动错误");  
                System.out.println(e.getMessage());  
            }  
    }

      /** 
     * 建立数据库连接 
     * @return 数据库连接 
     */  
    public Connection getConnectionForLoad() {  
        try {  
            // 获取连接  
            connnection = DriverManager.getConnection(URLSTR, USERNAME,  
                    USERPASSWORD);  
        } catch (SQLException e) {  
            System.out.println(e.getMessage());  
        }  
        return connnection;  
    }  
    /**
     * 
     * @return
     */
    public Connection getConnection() {
        Context ctx = null;
        Connection con = null;
        try {
            
            ctx = _ctx;
            javax.sql.DataSource ds = (javax.sql.DataSource) ctx.lookup(JNDI);
            con = ds.getConnection();
        } catch (Exception e) {

        }
        return con;
    }

    /** 
     * insert update delete SQL语句的执行的统一方法 
     * @param sql SQL语句 
     * @param params 参数数组，若没有参数则为null 
     * @return 受影响的行数 
     */  
    public int executeUpdate(String sql, Object[] params) {  
        // 受影响的行数  
        int affectedLine = 0;  
        try {  
            // 获得连接  
            connnection = this.getConnection();  
            // 调用SQL   
            preparedStatement = connnection.prepareStatement(sql);  
              
            // 参数赋值  
            if (params != null) {  
                for (int i = 0; i < params.length; i++) {  
                    preparedStatement.setObject(i + 1, params[i]);  
                }  
            }   
            // 执行  
            affectedLine = preparedStatement.executeUpdate();  
        } catch (SQLException e) {  
            System.out.println(e.getMessage());  
        } finally {  
            // 释放资源  
            closeAll();  
        }  
        return affectedLine;  
    }  
    
    /** 
     * 关闭所有资源 
     */  
    private void closeAll() {  
        // 关闭结果集对象  
        if (resultSet != null) {  
            try {  
                resultSet.close();  
            } catch (SQLException e) {  
                System.out.println(e.getMessage());  
            }  
        }  
  
        // 关闭PreparedStatement对象  
        if (preparedStatement != null) {  
            try {  
                preparedStatement.close();  
            } catch (SQLException e) {  
                System.out.println(e.getMessage());  
            }  
        }  
        // 关闭Connection 对象  
        if (connnection != null) {  
            try {  
                connnection.close();  
            } catch (SQLException e) {  
                System.out.println(e.getMessage());  
            }  
        }     
    }  
    
    /** 
     * SQL 查询将查询结果直接放入ResultSet中 
     * @param sql SQL语句 
     * @param params 参数数组，若没有参数则为null 
     * @return 结果集 
     */  
    private ResultSet executeQueryRS(String sql, Object[] params) {  
        try {  
            // 获得连接  
            connnection = this.getConnection();   
            // 调用SQL  
            preparedStatement = connnection.prepareStatement(sql);     
            // 参数赋值  
            if (params != null) {  
                for (int i = 0; i < params.length; i++) {  
                    preparedStatement.setObject(i + 1, params[i]);  
                }  
            }   
            // 执行  
            resultSet = preparedStatement.executeQuery();  
  
        } catch (SQLException e) {  
            System.out.println(e.getMessage());  
        }  
        return resultSet;  
    }  
    
    /** 
     * 获取结果集，并将结果放在List中 
     *  
     * @param sql 
     * SQL语句 
     * @return List 
     *  结果集 
     */  
    public List<Object> excuteQuery(String sql, Object[] params) {  
        // 执行SQL获得结果集  
        ResultSet rs = executeQueryRS(sql, params);   
        // 创建ResultSetMetaData对象  
        ResultSetMetaData rsmd = null;     
        // 结果集列数  
        int columnCount = 0;  
        try {  
            rsmd = rs.getMetaData();   
            // 获得结果集列数  
            columnCount = rsmd.getColumnCount();  
        } catch (SQLException e1) {  
            System.out.println(e1.getMessage());  
        }  
        // 创建List  
        List<Object> list = new ArrayList<Object>();  
        try {  
            // 将ResultSet的结果保存到List中  
            while (rs.next()) {  
                Map<String, Object> map = new HashMap<String, Object>();  
                for (int i = 1; i <= columnCount; i++) {  
                    map.put(rsmd.getColumnLabel(i), rs.getObject(i));  
                }  
                list.add(map);  
            }  
        } catch (SQLException e) {  
            System.out.println(e.getMessage());  
        } finally {  
            // 关闭所有资源  
            closeAll();  
        }  
  
        return list;  
    }  
    
    
    /** 
     * 存储过程带有一个输出参数的方法 
     * @param sql 存储过程语句 
     * @param params 参数数组 
     * @param outParamPos 输出参数位置 
     * @param SqlType 输出参数类型 
     * @return 输出参数的值 
     */  
    public Object excuteQuery(String sql, Object[] params,int outParamPos, int SqlType) {  
        Object object = null;  
        connnection = this.getConnection();  
        try {  
            // 调用存储过程  
            callableStatement = connnection.prepareCall(sql);  
              
            // 给参数赋值  
            if(params != null) {  
                for(int i = 0; i < params.length; i++) {  
                    callableStatement.setObject(i + 1, params[i]);  
                }  
            }   
            // 注册输出参数  
            callableStatement.registerOutParameter(outParamPos, SqlType);     
            // 执行  
            callableStatement.execute();  
            // 得到输出参数  
            object = callableStatement.getObject(outParamPos);  
              
        } catch (SQLException e) {  
            System.out.println(e.getMessage());  
        } finally {  
            // 释放资源  
            closeAll();  
        }  
          
        return object;  
      }  
    
    
   }