Esempio n. 1
0
func (s *testVisitorSuite) TestBase(c *C) {
	val := expression.Value{Val: 1}
	visitor := expression.NewIdentEvalVisitor()
	var exp expression.Expression
	exp = &expression.Between{Expr: val, Left: val, Right: val}
	exp.Accept(visitor)
	exp = expression.NewBinaryOperation(opcode.And, val, val)
	exp.Accept(visitor)
	exp, _ = expression.NewCall("avg", []expression.Expression{val}, true)
	exp.Accept(visitor)
	rows := [][]interface{}{{1}}
	sq := newMockSubQuery(rows, []string{"a"})
	exp = expression.NewCompareSubQuery(opcode.EQ, val, sq, true)
	exp.Accept(visitor)
	exp = &expression.Default{Name: "a"}
	exp.Accept(visitor)
	exp = expression.NewExistsSubQuery(sq)
	exp.Accept(visitor)

	when := &expression.WhenClause{Expr: val, Result: val}
	exp = &expression.FunctionCase{
		WhenClauses: []*expression.WhenClause{when},
		Value:       val,
		ElseClause:  val,
	}
	exp.Accept(visitor)
	exp = &expression.FunctionCast{Expr: val, Tp: types.NewFieldType(mysql.TypeLong), FunctionType: expression.ConvertFunction}
	exp.Accept(visitor)
	exp = &expression.FunctionConvert{Expr: val, Charset: "utf8"}
	exp.Accept(visitor)
	exp = &expression.FunctionSubstring{StrExpr: expression.Value{Val: "string"}, Pos: expression.Value{Val: 0}, Len: val}
	exp.Accept(visitor)
	exp = &expression.IsNull{Expr: val}
	exp.Accept(visitor)
	exp = &expression.IsTruth{Expr: val}
	exp.Accept(visitor)
	exp = &expression.ParamMarker{Expr: val}
	exp.Accept(visitor)
	exp = &expression.PatternIn{Expr: val, List: []expression.Expression{val}}
	exp.Accept(visitor)
	exp = &expression.PatternLike{Expr: val, Pattern: val}
	exp.Accept(visitor)
	exp = &expression.PatternRegexp{Expr: val, Pattern: val}
	exp.Accept(visitor)
	exp = &expression.PExpr{Expr: val}
	exp.Accept(visitor)
	exp = &expression.Position{Name: "a"}
	exp.Accept(visitor)
	exp = &expression.Row{Values: []expression.Expression{val}}
	exp.Accept(visitor)
	exp = &expression.UnaryOperation{V: val}
	exp.Accept(visitor)
	exp = &expression.Values{CIStr: model.NewCIStr("a")}
	exp.Accept(visitor)
	exp = &expression.Variable{Name: "a"}
	exp.Accept(visitor)
}
Esempio n. 2
0
func (s *testVisitorSuite) TestIdentEval(c *C) {
	exp := expression.NewBinaryOperation(opcode.Plus, &expression.Ident{CIStr: model.NewCIStr("a")}, expression.Value{Val: 1})
	iev := expression.NewIdentEvalVisitor()
	iev.Set("a", 3)
	exp.Accept(iev)
	v, err := exp.Eval(nil, nil)
	c.Assert(err, IsNil)
	c.Assert(v, Equals, int64(4))
}