Golang types.DefaultCharsetForType函数代码示例

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本文整理汇总了Golang中github.com/pingcap/tidb/util/types.DefaultCharsetForType函数的典型用法代码示例。如果您正苦于以下问题：Golang DefaultCharsetForType函数的具体用法？Golang DefaultCharsetForType怎么用？Golang DefaultCharsetForType使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。

在下文中一共展示了DefaultCharsetForType函数的6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，您的评价将有助于我们的系统推荐出更棒的Golang代码示例。

示例1: handleCaseExpr

// The return type of a CASE expression is the compatible aggregated type of all return values,
// but also depends on the context in which it is used.
// If used in a string context, the result is returned as a string.
// If used in a numeric context, the result is returned as a decimal, real, or integer value.
func (v *typeInferrer) handleCaseExpr(x *ast.CaseExpr) {
	var currType *types.FieldType
	for _, w := range x.WhenClauses {
		t := w.Result.GetType()
		if currType == nil {
			currType = t
			continue
		}
		mtp := types.MergeFieldType(currType.Tp, t.Tp)
		if mtp == t.Tp && mtp != currType.Tp {
			currType.Charset = t.Charset
			currType.Collate = t.Collate
		}
		currType.Tp = mtp

	}
	if x.ElseClause != nil {
		t := x.ElseClause.GetType()
		if currType == nil {
			currType = t
		} else {
			mtp := types.MergeFieldType(currType.Tp, t.Tp)
			if mtp == t.Tp && mtp != currType.Tp {
				currType.Charset = t.Charset
				currType.Collate = t.Collate
			}
			currType.Tp = mtp
		}
	}
	x.SetType(currType)
	// TODO: We need a better way to set charset/collation
	x.Type.Charset, x.Type.Collate = types.DefaultCharsetForType(x.Type.Tp)
}

开发者ID:yuanfeng0905，项目名称:tidb，代码行数:37，代码来源:typeinferer.go

示例2: addCastToString

// AddCastToString adds a cast function to string type if the expr charset is not UTF8.
func (v *typeInferrer) addCastToString(expr ast.ExprNode) ast.ExprNode {
	if !mysql.IsUTF8Charset(expr.GetType().Charset) {
		castTp := types.NewFieldType(mysql.TypeString)
		castTp.Charset, castTp.Collate = types.DefaultCharsetForType(mysql.TypeString)
		if val, ok := expr.(*ast.ValueExpr); ok {
			newVal, err := val.Datum.ConvertTo(v.sc, castTp)
			if err != nil {
				v.err = errors.Trace(err)
			}
			expr.SetDatum(newVal)
		} else {
			castFunc := &ast.FuncCastExpr{
				Expr:         expr,
				Tp:           castTp,
				FunctionType: ast.CastFunction,
			}
			expr = castFunc
		}
		expr.SetType(castTp)
	}
	return expr
}

开发者ID:pingcap，项目名称:tidb，代码行数:23，代码来源:typeinferer.go

示例3: Leave

func (v *typeInferrer) Leave(in ast.Node) (out ast.Node, ok bool) {
	switch x := in.(type) {
	case *ast.AggregateFuncExpr:
		v.aggregateFunc(x)
	case *ast.BetweenExpr:
		x.SetType(types.NewFieldType(mysql.TypeLonglong))
		x.Type.Charset = charset.CharsetBin
		x.Type.Collate = charset.CollationBin
	case *ast.BinaryOperationExpr:
		v.binaryOperation(x)
	case *ast.CaseExpr:
		v.handleCaseExpr(x)
	case *ast.ColumnNameExpr:
		x.SetType(&x.Refer.Column.FieldType)
	case *ast.CompareSubqueryExpr:
		x.SetType(types.NewFieldType(mysql.TypeLonglong))
		x.Type.Charset = charset.CharsetBin
		x.Type.Collate = charset.CollationBin
	case *ast.ExistsSubqueryExpr:
		x.SetType(types.NewFieldType(mysql.TypeLonglong))
		x.Type.Charset = charset.CharsetBin
		x.Type.Collate = charset.CollationBin
	case *ast.FuncCallExpr:
		v.handleFuncCallExpr(x)
	case *ast.FuncCastExpr:
		x.SetType(x.Tp)
		if len(x.Type.Charset) == 0 {
			x.Type.Charset, x.Type.Collate = types.DefaultCharsetForType(x.Type.Tp)
		}
	case *ast.IsNullExpr:
		x.SetType(types.NewFieldType(mysql.TypeLonglong))
		x.Type.Charset = charset.CharsetBin
		x.Type.Collate = charset.CollationBin
	case *ast.IsTruthExpr:
		x.SetType(types.NewFieldType(mysql.TypeLonglong))
		x.Type.Charset = charset.CharsetBin
		x.Type.Collate = charset.CollationBin
	case *ast.ParamMarkerExpr:
		x.SetType(types.DefaultTypeForValue(x.GetValue()))
	case *ast.ParenthesesExpr:
		x.SetType(x.Expr.GetType())
	case *ast.PatternInExpr:
		x.SetType(types.NewFieldType(mysql.TypeLonglong))
		x.Type.Charset = charset.CharsetBin
		x.Type.Collate = charset.CollationBin
	case *ast.PatternLikeExpr:
		x.SetType(types.NewFieldType(mysql.TypeLonglong))
		x.Type.Charset = charset.CharsetBin
		x.Type.Collate = charset.CollationBin
	case *ast.PatternRegexpExpr:
		x.SetType(types.NewFieldType(mysql.TypeLonglong))
		x.Type.Charset = charset.CharsetBin
		x.Type.Collate = charset.CollationBin
	case *ast.SelectStmt:
		v.selectStmt(x)
	case *ast.UnaryOperationExpr:
		v.unaryOperation(x)
	case *ast.ValueExpr:
		v.handleValueExpr(x)
	case *ast.VariableExpr:
		x.SetType(types.NewFieldType(mysql.TypeVarString))
		x.Type.Charset = v.defaultCharset
		cln, err := charset.GetDefaultCollation(v.defaultCharset)
		if err != nil {
			v.err = err
		}
		x.Type.Collate = cln
		// TODO: handle all expression types.
	}
	return in, true
}

开发者ID:yuanfeng0905，项目名称:tidb，代码行数:71，代码来源:typeinferer.go

示例4: fillShowFields

func (nr *nameResolver) fillShowFields(s *ast.ShowStmt) {
	if s.DBName == "" {
		if s.Table != nil && s.Table.Schema.L != "" {
			s.DBName = s.Table.Schema.O
		} else {
			s.DBName = nr.DefaultSchema.O
		}
	} else if s.Table != nil && s.Table.Schema.L == "" {
		s.Table.Schema = model.NewCIStr(s.DBName)
	}
	var fields []*ast.ResultField
	var (
		names  []string
		ftypes []byte
	)
	switch s.Tp {
	case ast.ShowEngines:
		names = []string{"Engine", "Support", "Comment", "Transactions", "XA", "Savepoints"}
	case ast.ShowDatabases:
		names = []string{"Database"}
	case ast.ShowTables:
		names = []string{fmt.Sprintf("Tables_in_%s", s.DBName)}
		if s.Full {
			names = append(names, "Table_type")
		}
	case ast.ShowTableStatus:
		names = []string{"Name", "Engine", "Version", "Row_format", "Rows", "Avg_row_length",
			"Data_length", "Max_data_length", "Index_length", "Data_free", "Auto_increment",
			"Create_time", "Update_time", "Check_time", "Collation", "Checksum",
			"Create_options", "Comment"}
		ftypes = []byte{mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLonglong, mysql.TypeVarchar, mysql.TypeLonglong, mysql.TypeLonglong,
			mysql.TypeLonglong, mysql.TypeLonglong, mysql.TypeLonglong, mysql.TypeLonglong, mysql.TypeLonglong,
			mysql.TypeDatetime, mysql.TypeDatetime, mysql.TypeDatetime, mysql.TypeVarchar, mysql.TypeVarchar,
			mysql.TypeVarchar, mysql.TypeVarchar}
	case ast.ShowColumns:
		names = table.ColDescFieldNames(s.Full)
	case ast.ShowWarnings:
		names = []string{"Level", "Code", "Message"}
		ftypes = []byte{mysql.TypeVarchar, mysql.TypeLong, mysql.TypeVarchar}
	case ast.ShowCharset:
		names = []string{"Charset", "Description", "Default collation", "Maxlen"}
		ftypes = []byte{mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLonglong}
	case ast.ShowVariables:
		names = []string{"Variable_name", "Value"}
	case ast.ShowStatus:
		names = []string{"Variable_name", "Value"}
	case ast.ShowCollation:
		names = []string{"Collation", "Charset", "Id", "Default", "Compiled", "Sortlen"}
		ftypes = []byte{mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLonglong,
			mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLonglong}
	case ast.ShowCreateTable:
		names = []string{"Table", "Create Table"}
	case ast.ShowGrants:
		names = []string{fmt.Sprintf("Grants for %s", s.User)}
	case ast.ShowTriggers:
		names = []string{"Trigger", "Event", "Table", "Statement", "Timing", "Created",
			"sql_mode", "Definer", "character_set_client", "collation_connection", "Database Collation"}
		ftypes = []byte{mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar,
			mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar}
	case ast.ShowProcedureStatus:
		names = []string{}
		ftypes = []byte{}
	case ast.ShowIndex:
		names = []string{"Table", "Non_unique", "Key_name", "Seq_in_index",
			"Column_name", "Collation", "Cardinality", "Sub_part", "Packed",
			"Null", "Index_type", "Comment", "Index_comment"}
		ftypes = []byte{mysql.TypeVarchar, mysql.TypeLonglong, mysql.TypeVarchar, mysql.TypeLonglong,
			mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLonglong, mysql.TypeLonglong,
			mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar}
	}
	for i, name := range names {
		f := &ast.ResultField{
			ColumnAsName: model.NewCIStr(name),
			Column:       &model.ColumnInfo{}, // Empty column info.
			Table:        &model.TableInfo{},  // Empty table info.
		}
		if ftypes == nil || ftypes[i] == 0 {
			// use varchar as the default return column type
			f.Column.Tp = mysql.TypeVarchar
		} else {
			f.Column.Tp = ftypes[i]
		}
		f.Column.Charset, f.Column.Collate = types.DefaultCharsetForType(f.Column.Tp)
		f.Expr = &ast.ValueExpr{}
		f.Expr.SetType(&f.Column.FieldType)
		fields = append(fields, f)
	}

	if s.Pattern != nil && s.Pattern.Expr == nil {
		rf := fields[0]
		s.Pattern.Expr = &ast.ColumnNameExpr{
			Name: &ast.ColumnName{Name: rf.ColumnAsName},
		}
		ast.SetFlag(s.Pattern)
	}
	s.SetResultFields(fields)
	nr.currentContext().fieldList = fields
}

开发者ID:XuHuaiyu，项目名称:tidb，代码行数:98，代码来源:resolver.go

示例5: newStringType

func newStringType() types.FieldType {
	ft := types.NewFieldType(mysql.TypeVarchar)
	ft.Charset, ft.Collate = types.DefaultCharsetForType(mysql.TypeVarchar)
	return *ft
}

开发者ID:pingcap，项目名称:tidb，代码行数:5，代码来源:logical_plan_test.go

示例6: GetFields

// GetFields implements plan.Plan GetFields interface.
func (s *ShowPlan) GetFields() []*field.ResultField {
	var (
		names  []string
		ftypes []byte
	)

	switch s.Target {
	case stmt.ShowEngines:
		names = []string{"Engine", "Support", "Comment", "Transactions", "XA", "Savepoints"}
	case stmt.ShowDatabases:
		names = []string{"Database"}
	case stmt.ShowTables:
		names = []string{fmt.Sprintf("Tables_in_%s", s.DBName)}
		if s.Full {
			names = append(names, "Table_type")
		}
	case stmt.ShowTableStatus:
		names = []string{"Name", "Engine", "Version", "Row_format", "Rows", "Avg_row_length",
			"Data_length", "Max_data_length", "Index_length", "Data_free", "Auto_increment",
			"Create_time", "Update_time", "Check_time", "Collation", "Checksum",
			"Create_options", "Comment"}
		ftypes = []byte{mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLonglong, mysql.TypeVarchar, mysql.TypeLonglong, mysql.TypeLonglong,
			mysql.TypeLonglong, mysql.TypeLonglong, mysql.TypeLonglong, mysql.TypeLonglong, mysql.TypeLonglong,
			mysql.TypeDatetime, mysql.TypeDatetime, mysql.TypeDatetime, mysql.TypeVarchar, mysql.TypeVarchar,
			mysql.TypeVarchar, mysql.TypeVarchar}
	case stmt.ShowColumns:
		names = column.ColDescFieldNames(s.Full)
	case stmt.ShowWarnings:
		names = []string{"Level", "Code", "Message"}
		ftypes = []byte{mysql.TypeVarchar, mysql.TypeLong, mysql.TypeVarchar}
	case stmt.ShowCharset:
		names = []string{"Charset", "Description", "Default collation", "Maxlen"}
		ftypes = []byte{mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLonglong}
	case stmt.ShowVariables:
		names = []string{"Variable_name", "Value"}
	case stmt.ShowStatus:
		names = []string{"Variable_name", "Value"}
	case stmt.ShowCollation:
		names = []string{"Collation", "Charset", "Id", "Default", "Compiled", "Sortlen"}
		ftypes = []byte{mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLonglong,
			mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLonglong}
	case stmt.ShowCreateTable:
		names = []string{"Table", "Create Table"}
	case stmt.ShowGrants:
		names = []string{fmt.Sprintf("Grants for %s", s.User)}
	case stmt.ShowTriggers:
		names = []string{"Trigger", "Event", "Table", "Statement", "Timing", "Created",
			"sql_mode", "Definer", "character_set_client", "collation_connection", "Database Collation"}
		ftypes = []byte{mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar,
			mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar}
	case stmt.ShowProcedureStatus:
		names = []string{}
		ftypes = []byte{}
	case stmt.ShowIndex:
		names = []string{"Table", "Non_unique", "Key_name", "Seq_in_index",
			"Column_name", "Collation", "Cardinality", "Sub_part", "Packed",
			"Null", "Index_type", "Comment", "Index_comment"}
		ftypes = []byte{mysql.TypeVarchar, mysql.TypeLonglong, mysql.TypeVarchar, mysql.TypeLonglong,
			mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLonglong, mysql.TypeLonglong,
			mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar}
	}
	fields := make([]*field.ResultField, 0, len(names))
	for i, name := range names {
		f := &field.ResultField{Name: name}
		if ftypes == nil || ftypes[i] == 0 {
			// use varchar as the default return column type
			f.Col.Tp = mysql.TypeVarchar
		} else {
			f.Col.Tp = ftypes[i]
		}
		f.Col.Charset, f.Col.Collate = types.DefaultCharsetForType(f.Col.Tp)
		fields = append(fields, f)
	}

	return fields
}

开发者ID:kellerli，项目名称:tidb，代码行数:77，代码来源:show.go

注：本文中的github.com/pingcap/tidb/util/types.DefaultCharsetForType函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。