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model.go
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// Copyright 2017, 2022 Tamás Gulácsi
//
// SPDX-License-Identifier: Apache-2.0
package main
import (
"bufio"
"context"
"database/sql"
"flag"
"fmt"
"io"
"os"
"strconv"
"strings"
oracall "github.com/tgulacsi/oracall/lib"
_ "github.com/godror/godror"
)
func generateModel(ctx context.Context, w io.Writer, db *sql.Tx, patterns []string, pkg string) error {
replUnderscore := strings.NewReplacer("_", "\\_")
var buf strings.Builder
buf.WriteByte('(')
args := make([]any, len(patterns))
for i, pat := range patterns {
if i != 0 {
buf.WriteString(" OR ")
}
a := pat
nm := fmt.Sprintf("a%03d", i+1)
if strings.IndexByte(pat, '%') >= 0 {
fmt.Fprintf(&buf, `A.table_name LIKE UPPER(:%s) ESCAPE '\'`, nm)
a = replUnderscore.Replace(pat)
} else {
fmt.Fprintf(&buf, `A.table_name = UPPER(:%s)`, nm)
}
args[i] = sql.Named(nm, a)
}
buf.WriteByte(')')
likeWhere := buf.String()
qry := `SELECT synonym_name, table_name FROM user_synonyms A WHERE ` +
strings.ReplaceAll(likeWhere, "A.table_name", "A.synonym_name") + `
UNION ALL
SELECT table_name, table_name FROM user_tables A WHERE ` +
likeWhere
rows, err := db.QueryContext(ctx, qry, args...)
if err != nil {
return fmt.Errorf("%s [%q]: %w", qry, args, err)
}
defer rows.Close()
buf.Reset()
tableNames := make(map[string]string)
for rows.Next() {
var syn, tbl string
if err := rows.Scan(&syn, &tbl); err != nil {
return fmt.Errorf("scan %s: %w", qry, err)
}
tableNames[tbl] = syn
if buf.Len() == 0 {
buf.WriteString("A.table_name IN (")
} else {
buf.WriteString(", ")
}
fmt.Fprintf(&buf, "'%s'", tbl)
}
rows.Close()
buf.WriteString(")")
likeWhere = buf.String()
qry = `SELECT table_name, column_name, data_type, data_length, NVL(data_precision, 0), NVL(data_scale, 0), nullable
FROM user_tab_cols A
WHERE INSTR(column_name, '$') = 0 AND virtual_column = 'NO' AND hidden_column = 'NO' AND
` + likeWhere + `
ORDER BY table_name, column_id`
rows, err = db.QueryContext(ctx, qry)
if err != nil {
return fmt.Errorf("%s: %w", qry, err)
}
defer rows.Close()
cols := make([]Column, 0, 16)
if flag.NArg() > 0 && !(flag.Arg(0) == "" || flag.Arg(0) == "-") {
if w, err = os.Create(flag.Arg(0)); err != nil {
return err
}
}
bw := bufio.NewWriter(w)
defer bw.Flush()
if pkg != "" {
if _, err = bw.WriteString(`// Code generated by oracall. DO NOT EDIT.
package ` + pkg + `
import (
"context"
"database/sql"
"fmt"
"time"
)
var _ sql.NullInt32
var _ time.Time
`); err != nil {
return err
}
}
columns := make(map[string]map[string]Column, 16)
A := func(tbl string, cols []Column) {
columns[tbl] = make(map[string]Column, len(cols))
for _, c := range cols {
columns[tbl][c.Name] = c
}
Table{Name: tbl, Cols: cols}.PrintStruct(bw)
}
var prev string
for rows.Next() {
var tbl string
var c Column
var n string
if err = rows.Scan(&tbl, &c.Name, &c.Type, &c.Len, &c.Prec, &c.Scale, &n); err != nil {
return fmt.Errorf("%s: %w", qry, err)
}
tbl = tableNames[tbl]
c.Nullable = n == "Y"
if prev != tbl {
if prev != "" {
A(prev, cols)
cols = cols[:0]
}
prev = tbl
}
cols = append(cols, c)
}
if prev != "" && len(cols) != 0 {
A(prev, cols)
}
{
qry := `SELECT B.index_name, B.table_name, B.column_name FROM user_ind_columns B, user_indexes A
WHERE B.table_name = A.table_name AND B.index_name = A.index_name AND A.uniqueness = 'UNIQUE' AND
` + likeWhere + `
ORDER BY A.table_name, B.column_position`
rows, err := db.QueryContext(ctx, qry)
if err != nil {
return fmt.Errorf("%s: %w", qry, err)
}
defer rows.Close()
A := func(idx, tbl string, cols []string) {
Tbl := camelCase(tbl)
bw.WriteString(`
func (t ` + Tbl + `) Save(ctx context.Context, tx *sql.Tx) error {
if ok, err := t.Exists(ctx, tx); err != nil {
return err
} else if ok {
return t.Update(ctx, tx)
}
return t.Insert(ctx, tx)
}
`)
cs := make([]string, len(cols))
ws := make([]string, len(cols))
ss := make([]string, len(cols))
qs := make([]string, len(cols))
ns := make([]string, len(cols))
cgt := make([]string, len(cols))
decl := make([]string, len(cols))
acs := make([]string, 0, len(columns[tbl]))
scn := make([]string, 0, cap(acs))
an := make([]string, 0, cap(acs))
indexCols := make(map[string]struct{}, len(cols))
for i, c := range cols {
col := columns[tbl][c]
C := camelCase(c)
acs = append(acs, c)
scn = append(scn, "&t."+C)
an = append(an, fmt.Sprintf("sql.Named(%q, t.%s)", C, C))
cs[i] = C
ns[i] = fmt.Sprintf("sql.Named(%q, t.%s)", C, C)
ws[i] = fmt.Sprintf("%s = :%s", c, C)
ss[i] = "t." + C
qs[i] = "%v"
cgt[i] = C + " " + col.GoType()
decl[i] = C + ": " + C
indexCols[c] = struct{}{}
}
for c := range columns[tbl] {
if _, ok := indexCols[c]; !ok {
acs = append(acs, c)
C := camelCase(c)
scn = append(scn, "&t."+C)
an = append(an, fmt.Sprintf("sql.Named(%q, t.%s)", C, C))
}
}
fieldList := strings.Join(acs, ", ")
where := strings.Join(ws, " AND ")
members := strings.Join(ss, ", ")
qS := strings.Join(qs, ", ")
named := strings.Join(ns, ", ")
var buf strings.Builder
for k := range columns[tbl] {
if _, ok := indexCols[k]; ok {
continue
}
if buf.Len() != 0 {
buf.WriteString(", ")
}
buf.WriteString(k + " = :" + camelCase(k))
}
set := buf.String()
fmt.Fprintf(bw, `
func Load%sBy%s(ctx context.Context, tx *sql.Tx, %s) (%s, error) {
t := %s{%s}
err := t.Load(ctx, tx)
return t, err
}
`,
Tbl, strings.Join(cs, ""), strings.Join(cgt, ", "), Tbl,
Tbl, strings.Join(decl, ", "),
)
fmt.Fprintf(bw, `
func (t *%s) Load(ctx context.Context, tx *sql.Tx) error {
const qry = "SELECT %s\n\tFROM %s\n\tWHERE %s"
if err := tx.QueryRowContext(ctx, qry,
%s,
).Scan(
%s,
); err != nil {
return fmt.Errorf("%%s [%s]: %%w", qry, %s, err)
}
return nil
}
`,
Tbl,
fieldList, tbl, where,
named,
strings.Join(scn, ", "),
qS, members,
)
fmt.Fprintf(bw, `
func (t %s) Exists(ctx context.Context, tx *sql.Tx) (bool, error) {
const qry = "SELECT COUNT(0) FROM DUAL WHERE EXISTS (SELECT 1 FROM %s WHERE %s)"
var n int32
if err := tx.QueryRowContext(ctx, qry, %s).Scan(&n); err != nil {
return false, fmt.Errorf("%%s [%s]: %%w", qry, %s, err)
}
return n !=0, nil
}
`,
Tbl,
tbl, where,
named,
qS, members,
)
fmt.Fprintf(bw, `
func (t %s) Update(ctx context.Context, tx *sql.Tx) error {
const qry = "UPDATE %s SET %s WHERE %s"
if _, err := tx.ExecContext(ctx, qry,
%s,
); err != nil {
return fmt.Errorf("%%s [%s]: %%w", qry, %s, err)
}
return nil
}
`,
Tbl,
tbl, set, where,
strings.Join(an, ", "),
qS, members,
)
}
var prevIdx, prevTbl string
cols := make([]string, 0, 4)
for rows.Next() {
var tbl, idx, col string
if err = rows.Scan(&idx, &tbl, &col); err != nil {
return fmt.Errorf("%s: %w", qry, err)
}
tbl = tableNames[tbl]
if prevIdx != idx {
if prevIdx != "" {
A(prevIdx, prevTbl, cols)
cols = cols[:0]
}
prevIdx, prevTbl = idx, tbl
}
if columns[tbl] == nil {
panic("nil column")
}
c := columns[tbl][col]
c.InIndex = append(c.InIndex, idx)
columns[tbl][col] = c
cols = append(cols, col)
}
if prevIdx != "" && len(cols) != 0 {
A(prevIdx, prevTbl, cols)
}
}
return nil
}
type Table struct {
Name string
Cols []Column
}
func (t Table) PrintStruct(w io.Writer) error {
bw := bufio.NewWriter(w)
defer bw.Flush()
nm := camelCase(t.Name)
bw.WriteString("type " + nm + " struct {\n")
dc := make([]string, len(t.Cols))
ph := make([]string, len(t.Cols))
f := make([]string, len(t.Cols))
qs := make([]string, len(t.Cols))
for i, c := range t.Cols {
c.PrintStruct(bw)
dc[i] = c.Name
ph[i] = ":" + strconv.FormatInt(int64(i)+1, 10)
f[i] = "t." + camelCase(c.Name)
qs[i] = "%v"
}
if _, err := bw.WriteString("}\n"); err != nil {
return err
}
fs := strings.Join(f, ", ")
fmt.Fprintf(bw, `func (t %s) Insert(ctx context.Context, tx *sql.Tx) error {
const qry = "INSERT INTO %s (%s)\nVALUES (%s)"
if _, err := tx.ExecContext(ctx, qry, %s); err != nil {
return fmt.Errorf("%%s [%s]: %%w",
qry,
%s,
err)
}
return nil
}
`,
nm,
t.Name, strings.Join(dc, ", "), strings.Join(ph, ", "),
fs,
strings.Join(qs, ", "), fs,
)
return nil
}
type Column struct {
Name, Type string
InIndex []string
Len, Prec, Scale int
Nullable bool
}
func camelCase(s string) string {
s = oracall.CamelCase(s)
for _, e := range []string{"Id", "Xml"} {
if strings.HasSuffix(s, e) {
return s[:len(s)-len(e)+1] + strings.ToUpper(e[1:])
}
}
return s
}
func (c Column) PrintStruct(w io.Writer) error {
_, err := fmt.Fprintf(w, "\t%s\t%s\n", camelCase(c.Name), c.GoType())
return err
}
func (c Column) GoType() string {
switch c.Type {
case "DATE":
if c.Nullable {
return "sql.NullTime"
}
return "time.Time"
case "NUMBER":
if c.Scale > 0 {
if c.Prec < 8 && !c.Nullable {
return "float32"
} else if c.Nullable {
return "sql.NullFloat64"
}
return "float64"
}
if c.Prec < 10 {
if c.Nullable {
return "sql.NullInt32"
}
return "int32"
} else if c.Prec < 19 {
if c.Nullable {
return "sql.NullInt64"
}
return "int64"
}
case "RAW":
return "[]byte"
}
return "string"
}