Expression常用方法使用

Expression在Restrictions类，引用using System.Linq.Expressions(dll);

下边整理下常用的几个方法及对应关系，后附其他相关表达式

表达式	对应SQL语法	例子
Expression.eq	fidld=value	Expression.eq("ame","张三")
Expression.gt	field>value	Expression.Gt("Age", 18)
Expression.ge	field>=value	Expression.Ge("Age", 18)
Expression.lt	field<value	Expression.lt("Age", 18)
Expression.le	field<=value	Expression.le("Age", 18)
Expression.between	between表达式	Expression.between("age",new Integer(16),new Integer(18))
Expression.like	field like value	Expression.Like("Name", "%张%")
Expression.in	field in value	Expression.In("Age", age)
Expression.and	and	Expression.and(Expression.eq("Name","张三"),Expression.eq("Age","26"))
Expression.or	or	Expression.or(Expression.eq("Name","张三"),Expression.eq("Age","26"))
Expression.sql	原生sql语法	Expression.Sql(string.Format("Age>=18"))
Expression.Not	not	Expression.Not(Expression.Eq("Name", "张三"))

附：

 public class Restrictions{public static AbstractCriterion AllEq(IDictionary propertyNameValues);public static AbstractCriterion And(ICriterion lhs, ICriterion rhs);public static AbstractCriterion Between(string propertyName, object lo, object hi);public static AbstractCriterion Between(IProjection projection, object lo, object hi);public static Conjunction Conjunction();public static Disjunction Disjunction();public static SimpleExpression Eq(string propertyName, object value);public static SimpleExpression Eq(IProjection projection, object value);public static AbstractCriterion EqProperty(IProjection projection, string otherPropertyName);public static AbstractCriterion EqProperty(string propertyName, string otherPropertyName);public static AbstractCriterion EqProperty(IProjection lshProjection, IProjection rshProjection);public static AbstractCriterion EqProperty(string propertyName, IProjection rshProjection);public static SimpleExpression Ge(IProjection projection, object value);public static SimpleExpression Ge(string propertyName, object value);public static AbstractCriterion GeProperty(IProjection projection, string otherPropertyName);public static AbstractCriterion GeProperty(IProjection lhsProjection, IProjection rhsProjection);public static AbstractCriterion GeProperty(string propertyName, string otherPropertyName);public static AbstractCriterion GeProperty(string propertyName, IProjection projection);public static SimpleExpression Gt(string propertyName, object value);public static SimpleExpression Gt(IProjection projection, object value);public static AbstractCriterion GtProperty(string propertyName, IProjection projection);public static AbstractCriterion GtProperty(IProjection projection, string otherPropertyName);public static AbstractCriterion GtProperty(string propertyName, string otherPropertyName);public static AbstractCriterion GtProperty(IProjection lhsProjection, IProjection rhsProjection);public static AbstractCriterion IdEq(IProjection projection);public static AbstractCriterion IdEq(object value);public static AbstractCriterion In(string propertyName, object[] values);public static AbstractCriterion In(IProjection projection, ICollection values);public static AbstractCriterion In(IProjection projection, object[] values);public static AbstractCriterion In(string propertyName, ICollection values);public static AbstractCriterion InG<T>(string propertyName, IEnumerable<T> values);public static AbstractCriterion InG<T>(IProjection projection, IEnumerable<T> values);public static AbstractCriterion InsensitiveLike(IProjection projection, object value);public static AbstractCriterion InsensitiveLike(string propertyName, object value);public static AbstractCriterion InsensitiveLike(string propertyName, string value, MatchMode matchMode);public static AbstractCriterion InsensitiveLike(IProjection projection, string value, MatchMode matchMode);public static AbstractEmptinessExpression IsEmpty(string propertyName);public static AbstractEmptinessExpression IsNotEmpty(string propertyName);public static AbstractCriterion IsNotNull(string propertyName);public static AbstractCriterion IsNotNull(IProjection projection);public static AbstractCriterion IsNull(IProjection projection);public static AbstractCriterion IsNull(string propertyName);public static SimpleExpression Le(IProjection projection, object value);public static SimpleExpression Le(string propertyName, object value);public static AbstractCriterion LeProperty(string propertyName, string otherPropertyName);public static AbstractCriterion LeProperty(IProjection projection, string otherPropertyName);public static AbstractCriterion LeProperty(string propertyName, IProjection projection);public static AbstractCriterion LeProperty(IProjection lhsProjection, IProjection rhsProjection);public static SimpleExpression Like(string propertyName, string value, MatchMode matchMode);public static SimpleExpression Like(string propertyName, object value);public static AbstractCriterion Like(string propertyName, string value, MatchMode matchMode, char? escapeChar);public static SimpleExpression Like(IProjection projection, object value);public static SimpleExpression Like(IProjection projection, string value, MatchMode matchMode);public static SimpleExpression Lt(IProjection projection, object value);public static SimpleExpression Lt(string propertyName, object value);public static AbstractCriterion LtProperty(IProjection lhsProjection, IProjection rhsProjection);public static AbstractCriterion LtProperty(string propertyName, IProjection projection);public static AbstractCriterion LtProperty(IProjection projection, string otherPropertyName);public static AbstractCriterion LtProperty(string propertyName, string otherPropertyName);public static NaturalIdentifier NaturalId();public static AbstractCriterion Not(ICriterion expression);public static AbstractCriterion NotEqProperty(string propertyName, string otherPropertyName);public static AbstractCriterion NotEqProperty(string propertyName, IProjection rhsProjection);public static AbstractCriterion NotEqProperty(IProjection lhsProjection, IProjection rhsProjection);public static AbstractCriterion NotEqProperty(IProjection projection, string otherPropertyName);public static LambdaRestrictionBuilder On<T>(Expression<Func<T, object>> expression);public static LambdaRestrictionBuilder On(Expression<Func<object>> expression);public static AbstractCriterion Or(ICriterion lhs, ICriterion rhs);public static ICriterion Where<T>(Expression<Func<T, bool>> expression);public static ICriterion Where(Expression<Func<bool>> expression);public static ICriterion WhereNot<T>(Expression<Func<T, bool>> expression);public static ICriterion WhereNot(Expression<Func<bool>> expression);}

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