/
ql.go
192 lines (176 loc) · 5.15 KB
/
ql.go
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package postgres
import (
"fmt"
"strings"
"github.com/cortezaproject/corteza/server/store/adapters/rdbms/ql"
"github.com/doug-martin/goqu/v9/exp"
)
var (
ref2exp = ql.ExprHandlerMap{
"concat": {
Handler: func(args ...exp.Expression) exp.Expression {
// need to force text type on all arguments
aa := make([]any, len(args))
for a := range args {
aa[a] = exp.NewCastExpression(exp.NewLiteralExpression("?", args[a]), "TEXT")
}
return exp.NewSQLFunctionExpression("CONCAT", aa...)
},
},
"instr": {
Handler: func(args ...exp.Expression) exp.Expression {
// need to force text type on all arguments
aa := make([]any, len(args))
for a := range args {
aa[a] = exp.NewCastExpression(exp.NewLiteralExpression("?", args[a]), "TEXT")
}
return exp.NewSQLFunctionExpression("INSTR", args[0], args[1])
},
},
// filtering
"now": {
Handler: func(args ...exp.Expression) exp.Expression {
return exp.NewSQLFunctionExpression("NOW")
},
},
"quarter": {
Handler: func(args ...exp.Expression) exp.Expression {
return exp.NewSQLFunctionExpression("EXTRACT",
exp.NewLiteralExpression("QUARTER FROM ?", args[0]),
)
},
},
"year": {
Handler: func(args ...exp.Expression) exp.Expression {
return exp.NewSQLFunctionExpression("EXTRACT",
exp.NewLiteralExpression("YEAR FROM ?", args[0]),
)
},
},
"month": {
Handler: func(args ...exp.Expression) exp.Expression {
return exp.NewSQLFunctionExpression("EXTRACT",
exp.NewLiteralExpression("MONTH FROM ?", args[0]),
)
},
},
"timestamp": {
Handler: func(args ...exp.Expression) exp.Expression {
return exp.NewLiteralExpression("?::TIMESTAMPTZ", args[0])
},
},
"date": {
Handler: func(args ...exp.Expression) exp.Expression {
return exp.NewLiteralExpression("?::DATE", args[0])
},
},
"day": {
Handler: func(args ...exp.Expression) exp.Expression {
return exp.NewSQLFunctionExpression("EXTRACT",
exp.NewLiteralExpression("DAY FROM ?", args[0]),
)
},
},
"week": {
Handler: func(args ...exp.Expression) exp.Expression {
return exp.NewSQLFunctionExpression("EXTRACT",
exp.NewLiteralExpression("WEEK FROM ?", args[0]),
)
},
},
"time": {
Handler: func(args ...exp.Expression) exp.Expression {
return exp.NewLiteralExpression("DATE_TRUNC('second', ?::TIME)::TIME", args[0])
},
},
// @todo replace given argument before constructing sql
"date_format": {
Handler: func(args ...exp.Expression) exp.Expression {
return exp.NewSQLFunctionExpression("TO_CHAR",
exp.NewLiteralExpression("?::TIMESTAMPTZ", args[0]),
exp.NewLiteralExpression("?::TEXT", translateDateFormatParam(args[1])),
)
},
},
"interval": {
Handler: func(args ...exp.Expression) exp.Expression {
// The problem here is that PGSQL, to my findings, doesn't have functions to add/sub dates
// like MySQL for example.
//
// We need to construct an expression in the lines of `INTERVAL 'N UNIT'` which
// then becomes, for example, d + INTERVAL 'N UNIT'.
//
// The problem #2 is that we can't just use value placeholders in string literals
// nor is there a 2 arg function to make an interval. There is a make_interval function
// but that one won't do.
//
// So...
// (? || 'S') makes the interval label a plural because MySQL uses singular and that
// is what QL supports. PgSQL uses plural, such as years, months, and days.
//
// The rest of the expression is just to construct the string which can then be casted to INTERVAL
// which can then be used in date math, which is done with regular math operators.
return exp.NewLiteralExpression("(?::INTEGER || ' ' || (? || 'S'))::INTERVAL", args[1], args[0])
},
},
"date_add": {
Handler: func(args ...exp.Expression) exp.Expression {
return exp.NewLiteralExpression("(? + ?)", args[0], args[1])
},
},
"date_sub": {
Handler: func(args ...exp.Expression) exp.Expression {
return exp.NewLiteralExpression("(? - ?)", args[0], args[1])
},
},
// functions currently unsupported in PostgreSQL store backend
// "STD": {
// Handler: func(args ...exp.Expression) exp.Expression {
// return exp.NewLiteralExpression("")
// },
// },
}.ExprHandlers()
)
func translateDateFormatParam(e interface{}) interface{} {
le, ok := e.(exp.LiteralExpression)
if !ok {
return e
}
args := le.Args()
if len(args) > 0 {
return dateFormatReplacer(fmt.Sprintf("%s", args[0]))
}
return e
}
func dateFormatReplacer(s string) string {
return strings.NewReplacer(
// @todo Doing ...%dT%H... (for iso timestamp) pgsql doesn't format it correctly
// so I'm covering this edge case.
// We should fix this properly when we redo record storage.
`%dT%H`, `DD"T"HH24`,
`%a`, `Dy`,
`%b`, `Mon`,
`%c`, `FMMM`,
`%d`, `DD`,
`%e`, `FMDD`,
`%f`, `US`,
`%H`, `HH24`,
`%h`, `HH12`,
`%I`, `HH12`,
`%i`, `MI`,
`%j`, `DDD`,
`%k`, `FMHH24`,
`%l`, `FMHH12`,
`%M`, `FMMonth`,
`%m`, `MM`,
`%p`, `AM`,
`%r`, `HH12:MI:SS AM`,
`%S`, `SS`,
`%s`, `SS`,
`%T`, `HH24:MI:SS`,
`%W`, `FMDay`,
`%Y`, `YYYY`,
`%y`, `YY`,
`%%`, `%`,
).Replace(s)
}