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db.go
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163 lines (137 loc) · 3.72 KB
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package db
import (
"database/sql"
"fmt"
"strings"
_ "github.com/lib/pq"
_ "modernc.org/sqlite"
"os"
)
type Result struct {
Columns []string
Rows [][]string
Error error
Warning string
}
type Database interface {
Query(query string) (*Result, error)
ListTables() (*Result, error)
ListSchemas() (*Result, error)
Close() error
}
type sqlDB struct {
db *sql.DB
driver string
}
func Connect(connStr string) (Database, error) {
var driver, dsn string
if strings.HasPrefix(connStr, "sqlite://") {
driver = "sqlite"
dsn = strings.TrimPrefix(connStr, "sqlite://")
// Check if file exists for sqlite
if _, err := os.Stat(dsn); os.IsNotExist(err) {
return nil, fmt.Errorf("sqlite database file not found: %s", dsn)
}
} else if strings.HasPrefix(connStr, "postgres://") {
driver = "postgres"
dsn = connStr
} else {
return nil, fmt.Errorf("unsupported database driver. use sqlite:// or postgres://")
}
db, err := sql.Open(driver, dsn)
if err != nil {
return nil, err
}
if err := db.Ping(); err != nil {
return nil, err
}
return &sqlDB{db: db, driver: driver}, nil
}
func (s *sqlDB) Query(query string) (*Result, error) {
upperQuery := strings.TrimSpace(strings.ToUpper(query))
isSelect := strings.HasPrefix(upperQuery, "SELECT") ||
strings.HasPrefix(upperQuery, "PRAGMA") ||
strings.HasPrefix(upperQuery, "SHOW") ||
strings.HasPrefix(upperQuery, "EXPLAIN") ||
strings.HasPrefix(upperQuery, "WITH")
var warning string
if isSelect && strings.HasPrefix(upperQuery, "SELECT") && !strings.Contains(upperQuery, " LIMIT ") {
// Remove trailing semicolon if present to append LIMIT safely
trimmedQuery := strings.TrimSpace(query)
trimmedQuery = strings.TrimSuffix(trimmedQuery, ";")
query = trimmedQuery + " LIMIT 500"
warning = "Note: Added LIMIT 500 to select statement."
}
if !isSelect {
res, err := s.db.Exec(query)
if err != nil {
return nil, err
}
rowsAffected, _ := res.RowsAffected()
lastInsertID, _ := res.LastInsertId()
msg := fmt.Sprintf("Success. Rows affected: %d", rowsAffected)
if lastInsertID > 0 {
msg += fmt.Sprintf(", Last Insert ID: %d", lastInsertID)
}
return &Result{
Columns: []string{"Status"},
Rows: [][]string{{msg}},
}, nil
}
rows, err := s.db.Query(query)
if err != nil {
return nil, err
}
defer rows.Close()
cols, err := rows.Columns()
if err != nil {
return nil, err
}
var resultRows [][]string
for rows.Next() {
values := make([]any, len(cols))
valuePtrs := make([]any, len(cols))
for i := range values {
valuePtrs[i] = &values[i]
}
if err := rows.Scan(valuePtrs...); err != nil {
return nil, err
}
row := make([]string, len(cols))
for i, val := range values {
if val == nil {
row[i] = "NULL"
} else {
row[i] = fmt.Sprintf("%v", val)
}
}
resultRows = append(resultRows, row)
}
return &Result{
Columns: cols,
Rows: resultRows,
Warning: warning,
}, nil
}
func (s *sqlDB) ListTables() (*Result, error) {
var query string
if s.driver == "sqlite" {
query = "SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%';"
} else {
query = "SELECT table_name FROM information_schema.tables WHERE table_schema NOT IN ('information_schema', 'pg_catalog') ORDER BY table_name;"
}
return s.Query(query)
}
func (s *sqlDB) ListSchemas() (*Result, error) {
var query string
if s.driver == "sqlite" {
// SQLite doesn't really have schemas in the same way, but it has attached databases
query = "PRAGMA database_list;"
} else {
query = "SELECT schema_name FROM information_schema.schemata WHERE schema_name NOT IN ('information_schema', 'pg_catalog') ORDER BY schema_name;"
}
return s.Query(query)
}
func (s *sqlDB) Close() error {
return s.db.Close()
}