本文整理汇总了Java中com.taobao.tddl.optimizer.core.expression.IFilter.OPERATION.GT属性的典型用法代码示例。如果您正苦于以下问题：Java OPERATION.GT属性的具体用法？Java OPERATION.GT怎么用？Java OPERATION.GT使用的例子？那么恭喜您, 这里精选的属性代码示例或许可以为您提供帮助。您也可以进一步了解该属性所在类com.taobao.tddl.optimizer.core.expression.IFilter.OPERATION的用法示例。
在下文中一共展示了OPERATION.GT属性的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: exchage
/**
* 如果是1 = id的情况，转化为id = 1
*/
private static IFilter exchage(IFilter root) {
IBooleanFilter bf = (IBooleanFilter) root;
if (!FilterUtils.isConstValue(bf.getValue()) && FilterUtils.isConstValue(bf.getColumn())) {
Object val = bf.getColumn();
bf.setColumn(bf.getValue());
bf.setValue(val);
OPERATION newOp = bf.getOperation();
switch (bf.getOperation()) {
case GT:
newOp = OPERATION.LT;
break;
case LT:
newOp = OPERATION.GT;
break;
case GT_EQ:
newOp = OPERATION.LT_EQ;
break;
case LT_EQ:
newOp = OPERATION.GT_EQ;
break;
default:
break;
}
bf.setOperation(newOp);
}
return bf;
}
示例2: selectivity
/**
* 参考derby数据库实现
*/
private static double selectivity(OPERATION operator) {
if (operator == OPERATION.EQ) {
return 0.1;
}
if (operator == OPERATION.GT || operator == OPERATION.GT_EQ) {
return 0.33;
}
if (operator == OPERATION.LT || operator == OPERATION.LT_EQ) {
return 0.33;
}
if (operator == OPERATION.NOT_EQ) {
return 0.9;
}
if (operator == OPERATION.IS_NULL) {
return 0.1;
}
if (operator == OPERATION.IS_NOT_NULL) {
return 0.9;
}
if (operator == OPERATION.LIKE) {
return 0.9;
}
if (operator == OPERATION.IN) {
return 0.2;
}
return 0.5;
}