A better way to write your predicate
Since you're formatting dates only to compare them, you should probably just compare the date values themselves, which will be much faster as your database will be able to use an index:
-- In SQL
ACCOUNT_PAYMENT.PAYMENT_DATE <= SYSDATE
// In jOOQ
ACCOUNT_PAYMENT.PAYMENT_DATE.le(DSL.currentDate())
Implementing a dialect-independent custom TO_CHAR()
function.
You should create a CustomField
for this purpose. This will allow you to interact with jOOQ's query rendering and variable binding lifecycle in order to render SQL dialect specific clauses depending on the RenderContext
's underlying SQLDialect
. Essentially this boils down to writing (assuming jOOQ 3.2 API):
class ToChar extends CustomField<String> {
final Field<?> arg0;
final Field<?> arg1;
ToChar(Field<?> arg0, Field<?> arg1) {
super("to_char", SQLDataType.VARCHAR);
this.arg0 = arg0;
this.arg1 = arg1;
}
@Override
public void toSQL(RenderContext context) {
context.visit(delegate(context.configuration()));
}
@Override
public void bind(BindContext context) {
context.visit(delegate(context.configuration()));
}
private QueryPart delegate(Configuration configuration) {
switch (configuration.dialect().family()) {
case ORACLE:
return DSL.field("TO_CHAR({0}, {1})",
String.class, arg0, arg1);
case SQLSERVER:
return DSL.field("CONVERT(VARCHAR(8), {0}, {1})",
String.class, arg0, arg1);
default:
throw new UnsupportedOperationException("Dialect not supported");
}
}
}
And then, you can write your own static utility methods as such:
public class MyDSL {
public static Field<String> toChar(Field<?> field, String format) {
return new ToChar(field, DSL.inline(format));
}
}