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="dp-xml">
- 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。