97 lines
2.2 KiB
Go
97 lines
2.2 KiB
Go
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package expression
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import (
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"errors"
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. "github.com/pingcap/check"
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"github.com/pingcap/tidb/mysql"
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"github.com/pingcap/tidb/util/charset"
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"github.com/pingcap/tidb/util/types"
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)
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var _ = Suite(&testCastSuite{})
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type testCastSuite struct {
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}
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func (s *testCastSuite) TestCast(c *C) {
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f := types.NewFieldType(mysql.TypeLonglong)
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expr := &FunctionCast{
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Expr: Value{1},
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Tp: f,
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}
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f.Flag |= mysql.UnsignedFlag
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c.Assert(len(expr.String()), Greater, 0)
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f.Flag = 0
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c.Assert(len(expr.String()), Greater, 0)
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f.Tp = mysql.TypeDatetime
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c.Assert(len(expr.String()), Greater, 0)
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f.Tp = mysql.TypeLonglong
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c.Assert(expr.Clone(), NotNil)
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c.Assert(expr.IsStatic(), IsTrue)
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v, err := expr.Eval(nil, nil)
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c.Assert(err, IsNil)
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c.Assert(v, Equals, int64(1))
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f.Flag |= mysql.UnsignedFlag
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v, err = expr.Eval(nil, nil)
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c.Assert(err, IsNil)
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c.Assert(v, Equals, uint64(1))
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f.Tp = mysql.TypeString
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f.Charset = charset.CharsetBin
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v, err = expr.Eval(nil, nil)
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c.Assert(err, IsNil)
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c.Assert(v, DeepEquals, []byte("1"))
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f.Tp = mysql.TypeString
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f.Charset = "utf8"
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v, err = expr.Eval(nil, nil)
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c.Assert(err, IsNil)
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c.Assert(v, DeepEquals, "1")
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expr.Expr = Value{nil}
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v, err = expr.Eval(nil, nil)
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c.Assert(err, IsNil)
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c.Assert(v, Equals, nil)
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expr.Expr = mockExpr{err: errors.New("must error")}
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c.Assert(expr.Clone(), NotNil)
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_, err = expr.Eval(nil, nil)
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c.Assert(err, NotNil)
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// For String()
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f = types.NewFieldType(mysql.TypeLonglong)
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expr = &FunctionCast{
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Expr: Value{1},
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Tp: f,
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}
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str := expr.String()
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c.Assert(str, Equals, "CAST(1 AS SIGNED)")
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expr.FunctionType = ConvertFunction
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str = expr.String()
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c.Assert(str, Equals, "CONVERT(1, SIGNED)")
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expr.FunctionType = BinaryOperator
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str = expr.String()
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c.Assert(str, Equals, "BINARY 1")
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}
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