Solved

JDBC INSERT problems

Posted on 2003-11-22
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Last Modified: 2010-03-31
I have tested the following:

      int update = statement1.executeUpdate(
            "INSERT INTO tablename " +
             "VALUES ('1', 10.25)");

and it works.

However if I want the values to be the result of method calls and not literally inserted, what syntax do i need?

      int update = statement1.executeUpdate(
            "INSERT INTO tablename " +
             "VALUES ('currentKey', 'z.getPrice()')");

this wont work even though currnetKey is an int and z.getName() returns a double.  I get a 'criteria mismatch problem'.  Do i need to wrap?  currentKey holds number in the db and z.getName() is for a column that holds decimal in the db.

confused.
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Question by:RedRichard
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Accepted Solution

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CEHJ earned 100 total points
ID: 9802926
The simplest way is to use a PreparedStatement

String sql = "INSERT INTO tablename VALUES (?, ?)";
PreparedStatement pstmt = con.prepareStatement(sql);
pstmt.setInt(1, currentKey);
pstmt.setDouble(2, z.getPrice());
pstmt.executeUpdate();


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LVL 86

Expert Comment

by:CEHJ
ID: 9802928
The sql would be better with the column names too:

String sql = "INSERT INTO tablename (col1, col2) VALUES (?, ?)";
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Author Comment

by:RedRichard
ID: 9802955
Thanks CEHJ,

Prepared statements might help me cut down on the headaches my
style of sql was giving me!
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LVL 86

Expert Comment

by:CEHJ
ID: 9802957
:-)
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LVL 86

Expert Comment

by:CEHJ
ID: 9802976
Bear in mind that theoretically you may take a performance hit from a PS as they are designed to optimise queries in loops and that comes at an DBMS price. However, this should not be noticeable. If, for some reason, it is. Let us know.
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