com.yahoo.squidb.sql.Query.limit()方法的使用及代码示例

x33g5p2x  于2022-01-29 转载在 其他  
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本文整理了Java中com.yahoo.squidb.sql.Query.limit方法的一些代码示例，展示了Query.limit的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Query.limit方法的具体详情如下：
包路径：com.yahoo.squidb.sql.Query
类名称：Query
方法名：limit

Query.limit介绍

[英]Set the limit of this statement. Using a negative value removes the limit.
[中]设置此语句的限制。使用负值可以消除限制。

代码示例

代码示例来源：origin: yahoo/squidb

/**
 * Set the limit of this statement. Using a negative value removes the limit.
 *
 * @param limit the maximum number of rows this query should return
 * @return this Query object, to allow chaining method calls
 */
public Query limit(int limit) {
  return limit(limit < 0 ? NO_LIMIT : Field.<Integer>field(Integer.toString(limit)));
}

代码示例来源：origin: yahoo/squidb

/**
 * Set the limit and offset of this statement. Use a negative value for limit to remove the limit. Use a value less
 * than one for offset to remove the offset.
 *
 * @param limit the maximum number of rows this query should return
 * @param offset the number of rows this query should skip
 * @return this Query object, to allow chaining method calls
 */
public Query limit(int limit, int offset) {
  return limit(limit < 0 ? NO_LIMIT : Field.<Integer>field(Integer.toString(limit)),
      offset < 1 ? NO_OFFSET : Field.<Integer>field(Integer.toString(offset)));
}

代码示例来源：origin: yahoo/squidb

protected <TYPE extends AbstractModel> SquidCursor<TYPE> fetchFirstItem(Class<TYPE> modelClass, Query query) {
  boolean immutableQuery = query.isImmutable();
  Field<Integer> beforeLimit = query.getLimit();
  SqlTable<?> beforeTable = query.getTable();
  query = query.limit(1); // If argument was frozen, we may get a new object
  SquidCursor<TYPE> cursor = query(modelClass, query);
  if (!immutableQuery) {
    query.from(beforeTable).limit(beforeLimit); // Reset for user
  }
  cursor.moveToFirst();
  return cursor;
}

代码示例来源：origin: yahoo/squidb

/**
 * Set the limit of this statement as a SQL expression; e.g. a {@link Function} or the result of
 * {@link #asFunction()} to use a subquery. Use {@link #NO_LIMIT} to remove the limit.
 *
 * @param limit the maximum number of rows this query should return
 * @return this Query object, to allow chaining method calls
 */
public Query limit(Field<Integer> limit) {
  if (limit == null) {
    limit = NO_LIMIT;
  }
  if (immutable) {
    return fork().limit(limit);
  }
  if (!this.limit.equals(limit)) {
    this.limit = limit;
    invalidateCompileCache();
  }
  return this;
}

代码示例来源：origin: yahoo/squidb

/**
 * Set the limit of this statement as a SQL expression; e.g. a {@link Function} or the result of
 * {@link #asFunction()} to use a subquery. Use {@link #NO_LIMIT} for limit to remove the limit. Use
 * {@link #NO_OFFSET} for offset to remove the offset.
 *
 * @param limit the maximum number of rows this query should return
 * @param offset the number of rows this query should skip
 * @return this Query object, to allow chaining method calls
 */
public Query limit(Field<Integer> limit, Field<Integer> offset) {
  if (limit == null) {
    limit = NO_LIMIT;
  }
  if (offset == null) {
    offset = NO_OFFSET;
  }
  if (immutable) {
    return fork().limit(limit, offset);
  }
  if (!this.limit.equals(limit) || !this.offset.equals(offset)) {
    this.limit = limit;
    this.offset = offset;
    invalidateCompileCache();
  }
  return this;
}

代码示例来源：origin: yahoo/squidb

public void testFork() {
  Query base = Query.select().from(Employee.TABLE).limit(1);
  Query fork = base.fork().limit(2);
  base.limit(3);
  assertFalse(base == fork);
  assertEquals(Field.field("3"), base.getLimit());
  assertEquals(Field.field("2"), fork.getLimit());
  assertEquals(base.getTable(), fork.getTable());
}

代码示例来源：origin: yahoo/squidb

public void testQueryFreeze() {
  Query base = Query.select().from(Employee.TABLE).limit(1).freeze();
  Query fork = base.limit(2);
  assertFalse(base == fork);
  assertEquals(Field.field("1"), base.getLimit());
  assertEquals(Field.field("2"), fork.getLimit());
  assertEquals(base.getTable(), fork.getTable());
}

代码示例来源：origin: com.yahoo.squidb/squidb

/**
 * Set the limit of this statement. Using a negative value removes the limit.
 *
 * @param limit the maximum number of rows this query should return
 * @return this Query object, to allow chaining method calls
 */
public Query limit(int limit) {
  return limit(limit < 0 ? NO_LIMIT : Field.<Integer>field(Integer.toString(limit)));
}

代码示例来源：origin: yahoo/squidb

private void testRecyclerAdapterInternal(LongProperty idProperty, RecyclerAdapterTest test) {
  Query query = Query.select(TestModel.PROPERTIES)
      .orderBy(TestModel.BIRTHDAY.asc())
      .limit(2);
  if (idProperty != null) {
    query.selectMore(idProperty);
  }
  SquidCursor<TestModel> cursor = database.query(TestModel.class, query);
  TestRecyclerAdapter adapter = new TestRecyclerAdapter(idProperty);
  adapter.changeCursor(cursor);
  try {
    test.testRecyclerAdapter(adapter);
  } finally {
    cursor.close();
  }
}

代码示例来源：origin: yahoo/squidb

public void testOrderByArray() {
  Long[] order = new Long[]{5L, 1L, 4L};
  SquidCursor<Employee> cursor = database.query(Employee.class,
      Query.select(Employee.ID).limit(order.length).orderBy(Employee.ID.byArray(order)));
  try {
    assertEquals(order.length, cursor.getCount());
    for (int i = 0; i < order.length; i++) {
      cursor.moveToPosition(i);
      assertEquals(order[i], cursor.get(Employee.ID));
    }
  } finally {
    cursor.close();
  }
}

代码示例来源：origin: com.yahoo.squidb/squidb

/**
 * Set the limit and offset of this statement. Use a negative value for limit to remove the limit. Use a value less
 * than one for offset to remove the offset.
 *
 * @param limit the maximum number of rows this query should return
 * @param offset the number of rows this query should skip
 * @return this Query object, to allow chaining method calls
 */
public Query limit(int limit, int offset) {
  return limit(limit < 0 ? NO_LIMIT : Field.<Integer>field(Integer.toString(limit)),
      offset < 1 ? NO_OFFSET : Field.<Integer>field(Integer.toString(offset)));
}

代码示例来源：origin: yahoo/squidb

cursor = database.query(Employee.class, query.limit(limit, offset));
assertEquals(expectedCount, cursor.getCount());
try {

代码示例来源：origin: yahoo/squidb

public void testFrozenQueryWorksWithDatabase() {
  Query query = Query.select().limit(2).freeze();
  SquidCursor<Employee> cursor = database.query(Employee.class, query);
  try {
    assertEquals(2, cursor.getCount());
    assertNull(query.getTable());
  } finally {
    cursor.close();
  }
  Employee employee = database.fetchByQuery(Employee.class, query);
  assertNotNull(employee);
  assertNull(query.getTable());
  assertEquals(Field.field("2"), query.getLimit());
}

代码示例来源：origin: yahoo/squidb

public void testInsertWithDefaultValues() {
  // insert into things default values;
  Insert insert = Insert.into(Thing.TABLE).defaultValues();
  CompiledStatement compiled = insert.compile(database.getCompileContext());
  verifyCompiledSqlArgs(compiled, 0);
  int rowsBeforeInsert = database.countAll(Thing.class);
  assertEquals(3, database.insert(insert));
  int rowsAfterInsert = database.countAll(Thing.class);
  assertEquals(rowsBeforeInsert + 1, rowsAfterInsert);
  // get the newest
  Thing newThing = null;
  SquidCursor<Thing> cursor = null;
  try {
    cursor = database.query(Thing.class, Query.select(Thing.PROPERTIES).orderBy(Order.desc(Thing.ID)).limit(1));
    if (cursor.moveToFirst()) {
      newThing = new Thing(cursor);
    }
  } finally {
    if (cursor != null) {
      cursor.close();
    }
  }
  assertNotNull(newThing);
  assertEquals(Thing.DEFAULT_FOO, newThing.getFoo());
  assertEquals(Thing.DEFAULT_BAR, newThing.getBar().intValue());
  assertEquals(Thing.DEFAULT_IS_ALIVE, newThing.isAlive().booleanValue());
}

代码示例来源：origin: com.yahoo.squidb/squidb

protected <TYPE extends AbstractModel> SquidCursor<TYPE> fetchFirstItem(Class<TYPE> modelClass, Query query) {
  boolean immutableQuery = query.isImmutable();
  Field<Integer> beforeLimit = query.getLimit();
  SqlTable<?> beforeTable = query.getTable();
  query = query.limit(1); // If argument was frozen, we may get a new object
  SquidCursor<TYPE> cursor = query(modelClass, query);
  if (!immutableQuery) {
    query.from(beforeTable).limit(beforeLimit); // Reset for user
  }
  cursor.moveToFirst();
  return cursor;
}

代码示例来源：origin: com.yahoo.squidb/squidb

/**
 * Set the limit of this statement as a SQL expression; e.g. a {@link Function} or the result of
 * {@link #asFunction()} to use a subquery. Use {@link #NO_LIMIT} to remove the limit.
 *
 * @param limit the maximum number of rows this query should return
 * @return this Query object, to allow chaining method calls
 */
public Query limit(Field<Integer> limit) {
  if (limit == null) {
    limit = NO_LIMIT;
  }
  if (immutable) {
    return fork().limit(limit);
  }
  if (!this.limit.equals(limit)) {
    this.limit = limit;
    invalidateCompileCache();
  }
  return this;
}

代码示例来源：origin: yahoo/squidb

public void testFetchByQueryResetsLimitAndTable() {
  TestModel model1 = new TestModel().setFirstName("Sam1").setLastName("Bosley1");
  TestModel model2 = new TestModel().setFirstName("Sam2").setLastName("Bosley2");
  TestModel model3 = new TestModel().setFirstName("Sam3").setLastName("Bosley3");
  database.persist(model1);
  database.persist(model2);
  database.persist(model3);
  Query query = Query.select().limit(2, 1);
  TestModel fetched = database.fetchByQuery(TestModel.class, query);
  assertEquals(model2.getRowId(), fetched.getRowId());
  assertEquals(Field.field("2"), query.getLimit());
  assertEquals(Field.field("1"), query.getOffset());
  assertEquals(null, query.getTable());
}

代码示例来源：origin: yahoo/squidb

public void testLimitAndOffsetWithExpressions() {
  // limit = 1 + (count(*) / 4), offset = count(*) / 2
  Field<Integer> limit = Function.add(1, Function.divide(
      Query.select(IntegerProperty.countProperty()).from(Employee.TABLE).asFunction(), 4));
  Field<Integer> offset = Function.divide(
      Query.select(IntegerProperty.countProperty()).from(Employee.TABLE).asFunction(), 2);
  Query query = Query.select().orderBy(Employee.NAME.asc()).limit(limit, offset);
  SquidCursor<Employee> cursor = database.query(Employee.class, query);
  try {
    assertEquals(2, cursor.getCount());
    cursor.moveToFirst();
    assertEquals(elmo, new Employee(cursor));
    cursor.moveToNext();
    assertEquals(ernie, new Employee(cursor));
  } finally {
    cursor.close();
  }
}

代码示例来源：origin: com.yahoo.squidb/squidb

/**
 * Set the limit of this statement as a SQL expression; e.g. a {@link Function} or the result of
 * {@link #asFunction()} to use a subquery. Use {@link #NO_LIMIT} for limit to remove the limit. Use
 * {@link #NO_OFFSET} for offset to remove the offset.
 *
 * @param limit the maximum number of rows this query should return
 * @param offset the number of rows this query should skip
 * @return this Query object, to allow chaining method calls
 */
public Query limit(Field<Integer> limit, Field<Integer> offset) {
  if (limit == null) {
    limit = NO_LIMIT;
  }
  if (offset == null) {
    offset = NO_OFFSET;
  }
  if (immutable) {
    return fork().limit(limit, offset);
  }
  if (!this.limit.equals(limit) || !this.offset.equals(offset)) {
    this.limit = limit;
    this.offset = offset;
    invalidateCompileCache();
  }
  return this;
}

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