98 lines
2.3 KiB
Go
98 lines
2.3 KiB
Go
package db
|
|
|
|
import (
|
|
"context"
|
|
"database/sql"
|
|
"fmt"
|
|
"os"
|
|
"strings"
|
|
|
|
_ "modernc.org/sqlite"
|
|
)
|
|
|
|
// openSQLite 打开 SQLite 库文件;文件不存在时报错而非静默建空库。
|
|
// DSN 追加 busy_timeout / foreign_keys pragma。
|
|
func openSQLite(c ConnReq) (*sql.DB, error) {
|
|
path := c.Database
|
|
if path == "" {
|
|
path = c.Host
|
|
}
|
|
if path == "" {
|
|
return nil, fmt.Errorf("SQLite 需要 database 填文件路径")
|
|
}
|
|
dsn := path
|
|
switch {
|
|
case path == ":memory:":
|
|
// 统一走 file: URI 以便携带 _pragma 参数
|
|
dsn = "file::memory:"
|
|
case strings.HasPrefix(path, "file:"):
|
|
// 调用方自带 URI 参数,不再做存在性检查
|
|
default:
|
|
if _, err := os.Stat(path); err != nil {
|
|
return nil, fmt.Errorf("SQLite 文件不存在: %s", path)
|
|
}
|
|
dsn = "file:" + path
|
|
}
|
|
sep := "?"
|
|
if strings.Contains(dsn, "?") {
|
|
sep = "&"
|
|
}
|
|
dsn += sep + "_pragma=busy_timeout(5000)&_pragma=foreign_keys(1)"
|
|
return sql.Open("sqlite", dsn)
|
|
}
|
|
|
|
func quoteSQLiteIdent(s string) string {
|
|
return `"` + strings.ReplaceAll(s, `"`, `""`) + `"`
|
|
}
|
|
|
|
func listDatabasesSQLite(_ *sql.DB) ([]string, error) {
|
|
return []string{"main"}, nil
|
|
}
|
|
|
|
func listTablesSQLite(ctx context.Context, db *sql.DB, _ string) ([]string, error) {
|
|
rows, err := db.QueryContext(ctx, `SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%' ORDER BY 1`)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer rows.Close()
|
|
out := []string{}
|
|
for rows.Next() {
|
|
var name string
|
|
if err := rows.Scan(&name); err != nil {
|
|
return nil, err
|
|
}
|
|
out = append(out, name)
|
|
}
|
|
return out, rows.Err()
|
|
}
|
|
|
|
func listColumnsSQLite(ctx context.Context, dbh *sql.DB, _, table string) ([]ColumnInfo, error) {
|
|
rows, err := dbh.QueryContext(ctx, `PRAGMA table_info(`+quoteSQLiteIdent(table)+`)`)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer rows.Close()
|
|
var out []ColumnInfo
|
|
for rows.Next() {
|
|
var cid int
|
|
var name, typ string
|
|
var notnull, pk int
|
|
var def sql.NullString
|
|
if err := rows.Scan(&cid, &name, &typ, ¬null, &def, &pk); err != nil {
|
|
return nil, err
|
|
}
|
|
col := ColumnInfo{Name: name, Type: typ, Nullable: notnull == 0}
|
|
if pk > 0 {
|
|
col.Key = "PRI"
|
|
}
|
|
if def.Valid {
|
|
col.Default = def.String
|
|
}
|
|
out = append(out, col)
|
|
}
|
|
if out == nil {
|
|
out = []ColumnInfo{}
|
|
}
|
|
return out, rows.Err()
|
|
}
|