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package catalog
import (
"errors"
"fmt"
"github.com/kyleconroy/sqlc/internal/sql/ast"
"github.com/kyleconroy/sqlc/internal/sql/sqlerr"
)
func (c *Catalog) alterTable(stmt *ast.AlterTableStmt) error {
var implemented bool
for _, item := range stmt.Cmds.Items {
switch cmd := item.(type) {
case *ast.AlterTableCmd:
switch cmd.Subtype {
case ast.AT_AddColumn:
implemented = true
case ast.AT_AlterColumnType:
implemented = true
case ast.AT_DropColumn:
implemented = true
case ast.AT_DropNotNull:
implemented = true
case ast.AT_SetNotNull:
implemented = true
}
}
}
if !implemented {
return nil
}
_, table, err := c.getTable(stmt.Table)
if err != nil {
return err
}
for _, cmd := range stmt.Cmds.Items {
switch cmd := cmd.(type) {
case *ast.AlterTableCmd:
idx := -1
// Lookup column names for column-related commands
switch cmd.Subtype {
case ast.AT_AlterColumnType,
ast.AT_DropColumn,
ast.AT_DropNotNull,
ast.AT_SetNotNull:
for i, c := range table.Columns {
if c.Name == *cmd.Name {
idx = i
break
}
}
if idx < 0 && !cmd.MissingOk {
return sqlerr.ColumnNotFound(table.Rel.Name, *cmd.Name)
}
// If a missing column is allowed, skip this command
if idx < 0 && cmd.MissingOk {
continue
}
}
switch cmd.Subtype {
case ast.AT_AddColumn:
for _, c := range table.Columns {
if c.Name == cmd.Def.Colname {
return sqlerr.ColumnExists(table.Rel.Name, c.Name)
}
}
table.Columns = append(table.Columns, &Column{
Name: cmd.Def.Colname,
Type: *cmd.Def.TypeName,
IsNotNull: cmd.Def.IsNotNull,
IsArray: cmd.Def.IsArray,
Length: cmd.Def.Length,
})
case ast.AT_AlterColumnType:
table.Columns[idx].Type = *cmd.Def.TypeName
table.Columns[idx].IsArray = cmd.Def.IsArray
case ast.AT_DropColumn:
table.Columns = append(table.Columns[:idx], table.Columns[idx+1:]...)
case ast.AT_DropNotNull:
table.Columns[idx].IsNotNull = false
case ast.AT_SetNotNull:
table.Columns[idx].IsNotNull = true
}
}
}
return nil
}
func (c *Catalog) alterTableSetSchema(stmt *ast.AlterTableSetSchemaStmt) error {
ns := stmt.Table.Schema
if ns == "" {
ns = c.DefaultSchema
}
oldSchema, err := c.getSchema(ns)
if err != nil {
return err
}
tbl, idx, err := oldSchema.getTable(stmt.Table)
if err != nil {
return err
}
newSchema, err := c.getSchema(*stmt.NewSchema)
if err != nil {
return err
}
if _, _, err := newSchema.getTable(stmt.Table); err == nil {
return sqlerr.RelationExists(stmt.Table.Name)
}
oldSchema.Tables = append(oldSchema.Tables[:idx], oldSchema.Tables[idx+1:]...)
newSchema.Tables = append(newSchema.Tables, tbl)
return nil
}
func (c *Catalog) createTable(stmt *ast.CreateTableStmt) error {
ns := stmt.Name.Schema
if ns == "" {
ns = c.DefaultSchema
}
schema, err := c.getSchema(ns)
if err != nil {
return err
}
_, _, err = schema.getTable(stmt.Name)
if err == nil && stmt.IfNotExists {
return nil
} else if err == nil {
return sqlerr.RelationExists(stmt.Name.Name)
}
tbl := Table{Rel: stmt.Name, Comment: stmt.Comment}
for _, inheritTable := range stmt.Inherits {
t, _, err := schema.getTable(inheritTable)
if err != nil {
return err
}
tbl.Columns = append(tbl.Columns, t.Columns...)
}
if stmt.ReferTable != nil && len(stmt.Cols) != 0 {
return errors.New("create table node cannot have both a ReferTable and Cols")
}
if stmt.ReferTable != nil {
_, original, err := c.getTable(stmt.ReferTable)
if err != nil {
return err
}
for _, col := range original.Columns {
newCol := *col // make a copy, so changes to the ReferTable don't propagate
tbl.Columns = append(tbl.Columns, &newCol)
}
} else {
for _, col := range stmt.Cols {
tc := &Column{
Name: col.Colname,
Type: *col.TypeName,
IsNotNull: col.IsNotNull,
IsArray: col.IsArray,
Comment: col.Comment,
Length: col.Length,
}
if col.Vals != nil {
typeName := ast.TypeName{
Name: fmt.Sprintf("%s_%s", stmt.Name.Name, col.Colname),
}
s := &ast.CreateEnumStmt{TypeName: &typeName, Vals: col.Vals}
if err := c.createEnum(s); err != nil {
return err
}
tc.Type = typeName
}
tbl.Columns = append(tbl.Columns, tc)
}
}
schema.Tables = append(schema.Tables, &tbl)
return nil
}
func (c *Catalog) dropTable(stmt *ast.DropTableStmt) error {
for _, name := range stmt.Tables {
ns := name.Schema
if ns == "" {
ns = c.DefaultSchema
}
schema, err := c.getSchema(ns)
if errors.Is(err, sqlerr.NotFound) && stmt.IfExists {
continue
} else if err != nil {
return err
}
_, idx, err := schema.getTable(name)
if errors.Is(err, sqlerr.NotFound) && stmt.IfExists {
continue
} else if err != nil {
return err
}
schema.Tables = append(schema.Tables[:idx], schema.Tables[idx+1:]...)
}
return nil
}
func (c *Catalog) renameColumn(stmt *ast.RenameColumnStmt) error {
_, tbl, err := c.getTable(stmt.Table)
if err != nil {
return err
}
idx := -1
for i := range tbl.Columns {
if tbl.Columns[i].Name == stmt.Col.Name {
idx = i
}
if tbl.Columns[i].Name == *stmt.NewName {
return sqlerr.ColumnExists(tbl.Rel.Name, *stmt.NewName)
}
}
if idx == -1 {
return sqlerr.ColumnNotFound(tbl.Rel.Name, stmt.Col.Name)
}
tbl.Columns[idx].Name = *stmt.NewName
return nil
}
func (c *Catalog) renameTable(stmt *ast.RenameTableStmt) error {
sch, tbl, err := c.getTable(stmt.Table)
if err != nil {
return err
}
if _, _, err := sch.getTable(&ast.TableName{Name: *stmt.NewName}); err == nil {
return sqlerr.RelationExists(*stmt.NewName)
}
if stmt.NewName != nil {
tbl.Rel.Name = *stmt.NewName
}
return nil
}