80 lines
2.0 KiB
Go
80 lines
2.0 KiB
Go
// 临时诊断：对照测试列元信息查询的"参数版"与"内联版"，定位 42601。
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package main
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import (
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"database/sql"
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"fmt"
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"log"
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"strings"
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_ "github.com/jackc/pgx/v5/stdlib"
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"fashionapi/internal/config"
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)
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func main() {
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cfg, err := config.Load("")
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if err != nil {
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log.Fatalf("load config: %v", err)
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}
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db, err := sql.Open("pgx", cfg.Database.DSN())
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if err != nil {
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log.Fatalf("open: %v", err)
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}
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defer db.Close()
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if err := db.Ping(); err != nil {
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log.Fatalf("ping: %v", err)
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}
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base := `
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SELECT c.column_name,
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c.udt_name,
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(c.is_nullable = 'YES'),
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COALESCE(c.column_default, ''),
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(c.column_default LIKE 'nextval(%')
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FROM information_schema.columns c
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WHERE c.table_schema = 'public' AND c.table_name = %s
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ORDER BY c.ordinal_position`
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// (a) 参数版：用 $1
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paramQ := strings.Replace(base, "%s", "$1", 1)
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fmt.Println("=== (a) 参数版 $1 ===")
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testQ(db, paramQ, "brands")
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// (b) 内联版：把 'brands' 直接拼进 SQL（模拟 simple-protocol 内联）
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inlineQ := strings.Replace(base, "%s", "'brands'", 1)
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fmt.Println("=== (b) 内联版 'brands' ===")
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testQ(db, inlineQ)
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// (c) 去掉 LIKE 表达式的版本（用 is_identity 代替）
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noLike := `
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SELECT c.column_name,
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c.udt_name,
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(c.is_nullable = 'YES'),
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COALESCE(c.column_default, ''),
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(c.is_identity = 'YES')
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FROM information_schema.columns c
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WHERE c.table_schema = 'public' AND c.table_name = 'brands'
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ORDER BY c.ordinal_position`
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fmt.Println("=== (c) 去掉 LIKE 表达式版 ===")
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testQ(db, noLike)
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}
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func testQ(db *sql.DB, q string, args ...any) {
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rows, err := db.Query(q, args...)
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if err != nil {
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fmt.Printf(" ERROR: %v\n", err)
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// 尝试用 pgconn 解析 position
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var pgErr interface{ Error() string }
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_ = pgErr
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fmt.Printf(" raw err: %s\n", err.Error())
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return
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}
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cnt := 0
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for rows.Next() {
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cnt++
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}
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fmt.Printf(" OK rows=%d err=%v\n", cnt, rows.Err())
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rows.Close()
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}
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