single quotation confusion

i am connecting a postgresql database to a netbeans form , and when i try to
execute a query which includes a string entered through a Jtextfield that
contain the special charachter " ' " it reads it as a single quotation
for example if a String txt = "it's cold" and to be inserted into a sql
query "insert into test values ('"+txt+"')";
it gives me
syntax error at or near "s"

any ideas how to solve that problem ??





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