Package org.mybatis.dynamic.sql.select
Interface CountDSLCompleter
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- All Superinterfaces:
java.util.function.Function<CountDSL<SelectModel>,Buildable<SelectModel>>
- Functional Interface:
- This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@FunctionalInterface public interface CountDSLCompleter extends java.util.function.Function<CountDSL<SelectModel>,Buildable<SelectModel>>
Represents a function that can be used to create a general count method. When using this function, you can create a method that does not require a user to call the build() and render() methods - making client code look a bit cleaner.This function is intended to by used in conjunction with a utility method like
MyBatis3Utils.countFrom(ToLongFunction, CountDSL, CountDSLCompleter)
For example, you can create mapper interface methods like this:
@SelectProvider(type=SqlProviderAdapter.class, method="select") long count(SelectStatementProvider selectStatement); default long count(CountDSLCompleter completer) { return MyBatis3Utils.count(this::count, person, completer); }
And then call the simplified default method like this:
long rows = mapper.count(c -> c.where(occupation, isNull()));
You can implement a "count all" with the following code:
long rows = mapper.count(c -> c);
Or
long rows = mapper.count(CountDSLCompleter.allRows());
- Author:
- Jeff Butler
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Method Summary
Static Methods Modifier and Type Method Description static CountDSLCompleter
allRows()
Returns a completer that can be used to count every row in a table.
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Method Detail
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allRows
static CountDSLCompleter allRows()
Returns a completer that can be used to count every row in a table.- Returns:
- the completer that will count every row in a table
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