上次我们介绍了DB2数据库创建触发器的实现过程,本文我们来介绍一下DB2数据库对存储过程的调用,接下来就让我们来一起了解一下这部分内容吧 。
一、对存储过程的调用分三部分
1.连接(与数据库建立连接)
- Class.forName("COM.ibm.db2.jdbc.net.DB2Driver").newInstance();
-
- Connection con=DriverManager.getConnection(url,user,password);
2.注册输出参数
- cs.registerOutParameter (3, Types.INTEGER);
3.调用存储过程:
- CallableStatement cs=con.prepareCall("{call store_name(参数,参数,参数)}");
二、调用举例:
- import java.net.URL;
-
- import java.sql.*;
-
- class test2
-
- {
-
- public static void main(String args[])
-
- {
-
- String url = "jdbc:db2://wellhope/sample";
-
- String user="db2admin";
-
- String password="db2admin";
-
- try
-
- {
-
- Class.forName("COM.ibm.db2.jdbc.net.DB2Driver").newInstance();
-
- //与数据库建立连接
-
- Connection con=DriverManager.getConnection(url,user,password);
-
- checkForWarning(con.getWarnings());
-
- DatabaseMetaData dma=con.getMetaData();
-
- String str="This is a string";
-
- //int hashcode=str.hashCode();
-
- //System.out.println("Hashcode "+hashcode);
-
- //创建Statement对象,用于执行SQL语句
-
- Statement stmt=con.createStatement();
-
- //创建CallableStatement对象,用于执行存储过程
-
- CallableStatement cs=con.prepareCall("{call PRO_YHDL1(?,?,?)}");
-
- //注册输出参数
-
- cs.registerOutParameter (3, Types.INTEGER);
-
- int result = 0;
-
- cs.setString(1,"123");
-
- cs.setString(2,"123");
-
- cs.execute();
-
- result = cs.getInt (3);
-
- dispResultSet(result);
-
- cs.close();
-
- con.close();
-
- }
-
- catch(SQLException ex)
-
- {
-
- System.out.println(" * * * SQLException caught * * * ");
-
- while(ex!=null)
-
- {
-
- System.out.println("SQLState: "+ex.getSQLState());
-
- System.out.println("Message: "+ex.getMessage());
-
- System.out.println("Vendor: "+ex.getErrorCode());
-
- exex=ex.getNextException();
-
- System.out.println("");
-
- }
-
- }
-
- catch(java.lang.Exception ex)
-
- {
-
- ex.printStackTrace();
-
- }
-
- }
三、存储过程举例:
Pro_yhdl1是一个存储过程,它的功能是从数据库表YHDL中取出PWD:
- import java.sql.*;
-
- public class Pro_yhdl1
-
- {
-
- public static void pro_yhdl1 ( String m_id,
-
- String m_pwd,
-
- int[] result ) throws SQLException, Exception
-
- {
-
- // Get connection to the database
-
- Connection con = DriverManager.getConnection("jdbc:default:connection");
-
- PreparedStatement stmt = null;
-
- ResultSet rs = null;
-
- String sql;
-
- String m_password="";
-
- sql = "SELECT"
-
- + " DB2ADMIN.YHDL.PWD"
-
- + " FROM"
-
- + " DB2ADMIN.YHDL"
-
- + " WHERE"
-
- + " ("
-
- + " ( "
-
- + " DB2ADMIN.YHDL.ID = "+m_id.trim()+""
-
- + " )"
-
- + " )";
-
- stmt = con.prepareStatement( sql );
-
- rs = stmt.executeQuery();
-
- // Access query results
-
- while (rs.next())
-
- {
-
- m_password=rs.getString(1);
-
- m_passwordm_password=m_password.trim();
-
- if (rs.wasNull())
-
- System.out.print("NULL");
-
- else
-
- System.out.print(m_password);
-
- }
-
- if(m_password.equals(m_pwd.trim()))
-
- {
-
- result[0] =1;
-
- }
-
- else
-
- {
-
- result[0] =0;
-
- }
-
- // close open resources
-
- if (rs != null) rs.close();
-
- if (stmt != null) stmt.close();
-
- if (con != null) con.close();
-
- // set return parameter
-
- //result[0] = result[0];
-
- }
-
- }
关于DB2数据库调用存储过程的知识就介绍到这里了,希望本次的介绍能够对您有所帮助 。