如何搜索表的内容？

解决方法

下面的方法通过使用 where & like SQL命令在数据库中进行搜索。

import java.sql.*;

public class jdbcConn {
   public static void main(String[] args) throws Exception{
      Class.forName("org.apache.derby.jdbc.ClientDriver");
      Connection con = DriverManager.getConnection
      ("jdbc:derby://localhost:1527/testDb","username",
      "password");
      Statement stmt = con.createStatement();
      String query[] ={"SELECT * FROM emp where id=1", 
      "select name from emp where name like 'ravi_'",
      "select name from emp where name like 'ravi%'"};
      for(String q : query){
         ResultSet rs = stmt.executeQuery(q);
         System.out.println("Names for query "+q+" are");
         while (rs.next()) {
            String name = rs.getString("name");
            System.out.print(name+"  ");
         }
         System.out.println();
      }
   }
}

结果

上面的代码示例将产生以下结果。该结果可能会不同。

Names for query SELECT * FROM emp where id=1 are
ravi  
Names for query select name from emp where name like 'ravi_' are
ravi2  ravi3  
Names for query select name from emp where name like 'ravi%' are
ravi  ravi2  ravi3  ravi123  ravi222