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how to make sure that my connection to database works?

Posted on 2007-04-09
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Last Modified: 2013-12-18
how to make sure that the connection string to my orical data base is correct.
this is my conection code in java

 // Database Connection object
    Connection conn = null;
 
    // Set database URL details.
    String url = "jdbc:oracle:thin:@localhost:1521:orcl";
    try {
     
      // Instantiate the driver class.
      Class.forName("oracle.jdbc.OracleDriver");
     
      // Get the database connection.
      conn = DriverManager.getConnection(url,"system","pass");
    }catch (Exception ex) {
        System.out.println("Exception while getting database connection: "
                           +ex.toString() );

can any one help me to write a select statment to make sure that it goes to my database???

I have this table created:
SQL> CREATE TABLE product_information(PRODUCT_ID           NUMBER(6)      NOT NULL,                                      PRODUCT_NAME         VARCHAR2(50)   NOT NULL,                                      PRODUCT_DESCRIPTION  VARCHAR2(2000) NOT NULL,                                       MIN_PRICE            NUMBER(8,2),                                      LIST_PRICE           NUMBER(8,2));SQL> INSERT INTO product_information VALUES(2400, 'DIMM - 512 MB',         '512 MB DIMM memory. Improved memory upgrade granularity', 380, 448);SQL> INSERT INTO product_information VALUES(2401, 'DIMM - 64MB',        'Memory DIMM: RAM, 64MB (100-MHz Unregistered ECC SDRAM)', 202, 247);SQL> INSERT INTO product_information VALUES(2402, 'EDO - 32MB',        'Memory EDO SIM: RAM, 32 MB (100-MHz Unregistered ECC SDRAM)', 149, 179);
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Question by:fm134
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1 Comment
 
LVL 10

Accepted Solution

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Jaax earned 2000 total points
ID: 18874745
You could code like this after securing the connection
conn = DriverManager.getConnection(url,"system","pass");
PreparedStatement prep = conn.prepareStatement("select * from product_information");
ResultSet rs = prep.executeQuery();
//Iteratore over the resultset


prep = conn.prepareStatement("select sysdate from dual");
rs = prep.executeQuery();
while(rs.next()){
      System.out.println("Date : "+rs.getDate("sysdate"));

}

OR querying to dual to check DB connection

PreparedStatement prep = conn.prepareStatement("select sysdate from dual");
ResultSet rs = prep.executeQuery();
while(rs.next()){
      System.out.println("Date : "+rs.getDate("sysdate"));

}



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