jet/generator/generator.go

163 lines
2.7 KiB
Go

package generator
import (
"database/sql"
_ "github.com/lib/pq"
"github.com/serenize/snaker"
"os"
)
type DbConnectInfo struct {
host string
port int
user string
password string
dbname string
}
func Generate(folderPath string, connectString string, databaseName, schemaName string) error {
if _, err := os.Stat(folderPath); os.IsNotExist(err) {
err := os.Mkdir(folderPath, os.ModePerm)
if err != nil {
return err
}
}
db, err := sql.Open("postgres", connectString)
if err != nil {
return err
}
defer db.Close()
err = db.Ping()
if err != nil {
return err
}
tables, err := getTablesInfo(db, schemaName)
if err != nil {
return err
}
for _, table := range tables {
err = generateSqlBuilderModel(databaseName, schemaName, table, folderPath)
if err != nil {
return err
}
}
return nil
}
type TableInfo struct {
Name string
Columns []ColumnInfo
}
func getTablesInfo(db *sql.DB, schemaName string) ([]TableInfo, error) {
tableNames, err := getListOfTables(db, schemaName)
if err != nil {
return nil, err
}
tables := []TableInfo{}
for _, tableName := range tableNames {
columns, err := getColumnInfos(db, tableName)
if err != nil {
return nil, err
}
tables = append(tables, TableInfo{tableName, columns})
}
return tables, nil
}
func getListOfTables(db *sql.DB, schemaName string) ([]string, error) {
rows, err := db.Query(`
SELECT table_name FROM information_schema.tables
where table_schema = $1 and table_type = 'BASE TABLE';`, schemaName)
if err != nil {
return nil, err
}
defer rows.Close()
tables := []string{}
for rows.Next() {
var table string
err = rows.Scan(&table)
if err != nil {
return nil, err
}
tables = append(tables, table)
}
err = rows.Err()
if err != nil {
return nil, err
}
return tables, nil
}
type ColumnInfo struct {
Name string
IsNullable bool
DataType string
}
func (c *ColumnInfo) CamelCaseName() string {
return snaker.SnakeToCamel(c.Name)
}
func getColumnInfos(db *sql.DB, tableName string) ([]ColumnInfo, error) {
query := `
SELECT column_name, is_nullable, data_type
FROM information_schema.columns
where table_name = $1
order by ordinal_position;`
//fmt.Println(query)
rows, err := db.Query(query, &tableName)
if err != nil {
return nil, err
}
defer rows.Close()
ret := []ColumnInfo{}
for rows.Next() {
columnInfo := ColumnInfo{}
var isNullable string
err := rows.Scan(&columnInfo.Name, &isNullable, &columnInfo.DataType)
columnInfo.IsNullable = isNullable == "YES"
if err != nil {
return nil, err
}
ret = append(ret, columnInfo)
}
err = rows.Err()
if err != nil {
return nil, err
}
return ret, nil
}