Add support for CASE operator.
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zer0sub
parent
3367df247c
commit
4f9323ddca
18 changed files with 243 additions and 272 deletions
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@ -7,69 +7,6 @@ import (
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"time"
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)
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// Representation of a tuple enclosed, comma separated list of clauses
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//type listClause struct {
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// clauses []Clause
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// includeParentheses bool
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//}
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//
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//func (list *listClause) Serialize(out *queryData, options ...serializeOption) error {
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// if list.includeParentheses {
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// out.WriteByte('(')
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// }
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//
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// if err := serializeClauseList(list.clauses, out); err != nil {
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// return err
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// }
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//
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// if list.includeParentheses {
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// out.WriteByte(')')
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// }
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// return nil
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//}
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//
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//type funcExpression struct {
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// expressionInterfaceImpl
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// funcName string
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// args *listClause
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//}
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//
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//func (c *funcExpression) Serialize(out *queryData, options ...serializeOption) error {
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// if !validIdentifierName(c.funcName) {
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// return errors.Newf(
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// "Invalid function name: %s.",
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// c.funcName,
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// out.String())
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// }
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// _, _ = out.WriteString(c.funcName)
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// if c.args == nil {
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// _, _ = out.WriteString("()")
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// } else {
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// return c.args.Serialize(out)
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// }
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// return nil
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//}
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//
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//// Returns a representation of sql function call "func_call(c[0], ..., c[n-1])
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//func SqlFunc(funcName string, expressions ...Expression) Expression {
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// f := &funcExpression{
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// funcName: funcName,
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// }
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// if len(expressions) > 0 {
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// args := make([]Clause, len(expressions), len(expressions))
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// for i, expr := range expressions {
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// args[i] = expr
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// }
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//
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// f.args = &listClause{
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// clauses: args,
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// includeParentheses: true,
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// }
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// }
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// return f
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//}
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type intervalExpression struct {
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expressionInterfaceImpl
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duration time.Duration
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@ -118,137 +55,3 @@ var likeEscaper = strings.NewReplacer("_", "\\_", "%", "\\%")
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func EscapeForLike(s string) string {
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return likeEscaper.Replace(s)
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}
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// Returns an escaped literal string
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//func Literal(v interface{}) Expression {
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// value, err := sqltypes.BuildValue(v)
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// if err != nil {
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// panic(errors.Wrap(err, "Invalid literal value"))
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// }
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// return NewLiteralExpression(value)
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//}
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//
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//// Returns a representation of "c[0] + ... + c[n-1]" for c in clauses
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//func Add(expressions ...Expression) Expression {
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// return &arithmeticExpression{
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// expressions: expressions,
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// operator: []byte(" + "),
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// }
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//}
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//
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//// Returns a representation of "c[0] - ... - c[n-1]" for c in clauses
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//func Sub(expressions ...Expression) Expression {
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// return &arithmeticExpression{
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// expressions: expressions,
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// operator: []byte(" - "),
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// }
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//}
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//
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//// Returns a representation of "c[0] * ... * c[n-1]" for c in clauses
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//func Mul(expressions ...Expression) Expression {
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// return &arithmeticExpression{
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// expressions: expressions,
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// operator: []byte(" * "),
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// }
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//}
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//
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//// Returns a representation of "c[0] / ... / c[n-1]" for c in clauses
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//func Div(expressions ...Expression) Expression {
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// return &arithmeticExpression{
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// expressions: expressions,
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// operator: []byte(" / "),
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// }
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//}
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//TODO: Uncomment
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//
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//func BitOr(lhs, rhs Expression) Expression {
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// return &binaryExpression{
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// lhs: lhs,
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// rhs: rhs,
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// operator: []byte(" | "),
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// }
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//}
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//
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//func BitAnd(lhs, rhs Expression) Expression {
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// return &binaryExpression{
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// lhs: lhs,
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// rhs: rhs,
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// operator: []byte(" & "),
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// }
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//}
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//
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//func BitXor(lhs, rhs Expression) Expression {
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// return &binaryExpression{
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// lhs: lhs,
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// rhs: rhs,
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// operator: []byte(" ^ "),
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// }
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//}
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//
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//func Plus(lhs, rhs Expression) Expression {
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// return &binaryExpression{
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// lhs: lhs,
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// rhs: rhs,
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// operator: []byte(" + "),
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// }
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//}
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//
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//func Minus(lhs, rhs Expression) Expression {
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// return &binaryExpression{
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// lhs: lhs,
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// rhs: rhs,
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// operator: []byte(" - "),
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// }
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//}
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type ifExpression struct {
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expressionInterfaceImpl
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conditional BoolExpression
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trueExpression Expression
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falseExpression Expression
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}
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func (exp *ifExpression) Serialize(out *queryData, options ...serializeOption) error {
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out.WriteString("IF(")
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_ = exp.conditional.Serialize(out)
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out.WriteString(",")
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_ = exp.trueExpression.Serialize(out)
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out.WriteString(",")
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_ = exp.falseExpression.Serialize(out)
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out.WriteString(")")
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return nil
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}
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// Returns a representation of an if-expression, of the form:
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// IF (BOOLEAN TEST, VALUE-IF-TRUE, VALUE-IF-FALSE)
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func If(conditional BoolExpression,
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trueExpression Expression,
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falseExpression Expression) Expression {
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return &ifExpression{
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conditional: conditional,
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trueExpression: trueExpression,
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falseExpression: falseExpression,
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}
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}
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//TODO: Uncomment
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//type columnValueExpression struct {
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// isExpression
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// column NonAliasColumn
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//}
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//
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//func ColumnValue(col NonAliasColumn) Expression {
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// return &columnValueExpression{
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// column: col,
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// }
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//}
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//
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//func (cv *columnValueExpression) Serialize(out *bytes.Buffer) error {
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// _, _ = out.WriteString("VALUES(")
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// _ = cv.column.SerializeSqlForColumnList(out)
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// _ = out.WriteByte(')')
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// return nil
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//}
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