This library is snapshot in 2015 of how I felt we should be thinking about application SQL queries. Not intended or suited for production use.
JDBJ is a small jdbc fluent interface for capturing query intent before query execution.
- Named Parameters (No Positional Parameters, ever)
- Collections bindable (not during batch execution)
- Null-Safe fetching of (Boolean|Byte|Double|Float|Integer|Long|Short)
- Lambda interface for bindings, transactions
- Fetch-forward read-only cursors, always
- Script Execution, with parameters
- Comprehensive test suites for latest postgres, h2, derby, SQLite, MySql
Insert inside a transaction:
//INSERT some students
final List<NewStudent> newStudents = Arrays.asList(
new NewStudent("Ada", "Lovelace", new BigDecimal("4.00")),
new NewStudent("Haskell", "Curry", new BigDecimal("4.00"))
);
//NewStudent.INSERT is the resource which contains our sql statement
final ExecuteInsert<Long> insert = JDBJ.resource("student_insert.sql")
.insert(rs->rs.getLong(1));
//db is a javax.sql.DataSource
List<Long> generatedKeys = JDBJ.transaction(connection -> {
final List<Long> keys = new ArrayList<>();
for (NewStudent newStudent : newStudents) {
keys.addAll(insert.bindValues(newStudent::bindings).execute(connection));
}
return keys;
}).execute(db);Select to list:
//setup query object
final MapQuery<Student> studentsByIds = JDBJ.resource("student_by_ids_limit.sql")
.query()
.bindLong(":limit", 10L)
.bindLongs(":ids", generatedKeys)
.map(Student::from);
//get as list
final ExecuteQuery<List<Student>> listQuery = studentsByIds
.toList();
System.out.println(listQuery.execute(db));Select to stream:
//get as stream
final StreamQuery<Student> streamQuery = studentsByIds
.toStream();
try (Stream<Student> stream = streamQuery.execute(db)) {
stream.forEach(System.out::println);
}A full set of examples is being developed in the examples-branch, but here are some quick examples maintained in the test directory:
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