wehub-resource-sync
130 lines
4.1 KiB
Go
130 lines
4.1 KiB
Go
// Copyright 2024 Dolthub, 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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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 functions
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import (
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"fmt"
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"strings"
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/dolthub/doltgresql/core/id"
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"github.com/dolthub/doltgresql/server/functions/framework"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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)
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// initPgGetConstraintdef registers the functions to the catalog.
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func initPgGetConstraintdef() {
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framework.RegisterFunction(pg_get_constraintdef_oid)
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framework.RegisterFunction(pg_get_constraintdef_oid_bool)
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}
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// pg_get_constraintdef_oid represents the PostgreSQL function of the same name, taking the same parameters.
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var pg_get_constraintdef_oid = framework.Function1{
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Name: "pg_get_constraintdef",
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Return: pgtypes.Text,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.Oid},
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Strict: true,
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Callable: func(ctx *sql.Context, _ [2]*pgtypes.DoltgresType, val1 any) (any, error) {
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oidVal := val1.(id.Id)
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def, err := getConstraintDef(ctx, oidVal)
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return def, err
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},
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}
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// pg_get_constraintdef_oid_bool represents the PostgreSQL function of the same name, taking the same parameters.
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var pg_get_constraintdef_oid_bool = framework.Function2{
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Name: "pg_get_constraintdef",
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Return: pgtypes.Text,
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Parameters: [2]*pgtypes.DoltgresType{pgtypes.Oid, pgtypes.Bool},
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Strict: true,
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Callable: func(ctx *sql.Context, _ [3]*pgtypes.DoltgresType, val1, val2 any) (any, error) {
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oidVal := val1.(id.Id)
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pretty := val2.(bool)
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if pretty {
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ctx.Warn(0, "pretty printing is not yet supported")
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}
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def, err := getConstraintDef(ctx, oidVal)
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if err != nil {
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return nil, err
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}
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return def, nil
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},
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}
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// getConstraintDef returns the definition of the constraint for the given OID.
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func getConstraintDef(ctx *sql.Context, oidVal id.Id) (string, error) {
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var result string
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err := RunCallback(ctx, oidVal, Callbacks{
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Check: func(ctx *sql.Context, schema ItemSchema, table ItemTable, check ItemCheck) (cont bool, err error) {
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name := check.Item.Name
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if len(name) > 0 {
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name += " "
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}
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not := ""
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if !check.Item.Enforced {
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not = "not "
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}
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result = fmt.Sprintf("%sCHECK %s %sENFORCED", name, check.Item.CheckExpression, not)
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return false, nil
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},
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ForeignKey: func(ctx *sql.Context, schema ItemSchema, table ItemTable, fk ItemForeignKey) (cont bool, err error) {
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// Note the postgres doesn't include the name of a foreign key when printing it via pg_get_constraintdef
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// The spacing here is also significant, as certain tools (SQLAlchemy) use regex to parse
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result = fmt.Sprintf(
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"FOREIGN KEY (%s) REFERENCES %s(%s)",
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getColumnNamesString(fk.Item.Columns),
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fk.Item.ParentTable,
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getColumnNamesString(fk.Item.ParentColumns),
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)
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if fk.Item.IsNotValid {
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result += " NOT VALID"
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}
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return false, nil
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},
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Index: func(ctx *sql.Context, schema ItemSchema, table ItemTable, index ItemIndex) (cont bool, err error) {
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colsStr := getColumnNamesString(index.Item.Expressions())
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if strings.ToLower(index.Item.ID()) == "primary" {
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result = fmt.Sprintf("PRIMARY KEY (%s)", colsStr)
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} else {
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result = fmt.Sprintf("UNIQUE (%s)", colsStr)
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}
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return false, nil
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},
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})
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if err != nil {
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return "", err
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}
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return result, nil
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}
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// getColumnNamesString returns a comma-separated string of column names with
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// the table names removed from a list of expressions.
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func getColumnNamesString(exprs []string) string {
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colNames := make([]string, len(exprs))
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for i, expr := range exprs {
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split := strings.Split(expr, ".")
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if len(split) == 0 {
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return ""
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}
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if len(split) == 1 {
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colNames[i] = split[0]
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} else {
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colNames[i] = split[1]
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}
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}
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return strings.Join(colNames, ", ")
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}
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