/
main.go
93 lines (76 loc) · 2.22 KB
/
main.go
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package main
import (
"database/sql"
"encoding/json"
"fmt"
"os"
"strings"
"github.com/cohesion/query"
_ "github.com/go-sql-driver/mysql"
)
const invalidParamMsg = "Please set env variable DB_DSN to a valid MySQL connection string"
type dependentTable struct {
TableName string `json:"table"`
ColumnName string `json:"column"`
}
type mainTable struct {
TableName string `json:"table"`
DependentTables []dependentTable `json:"dependent_tables"`
}
func main() {
dbDsn := os.Getenv("DB_DSN")
if dbDsn == "" {
fmt.Fprint(os.Stderr, invalidParamMsg)
os.Exit(1)
}
temp := strings.SplitAfter(dbDsn, "/")
dbName := temp[1]
db, err := sql.Open("mysql", dbDsn)
if err != nil {
fmt.Println(err.Error())
os.Exit(1)
}
defer db.Close()
tables := getRows(db, query.ShowTableStatement)
var tableName string
for tables.Next() {
err = tables.Scan(&tableName)
if err != nil {
fmt.Println(err.Error())
}
currentTable := mainTable{TableName: tableName}
getAutoIncrementQuery := fmt.Sprintf(query.GetAutoIncrementStatement, tableName, dbName)
autoIncrement := getRows(db, getAutoIncrementQuery)
var autoIncrementColumn string
for autoIncrement.Next() {
err = autoIncrement.Scan(&autoIncrementColumn)
if err != nil {
fmt.Println(err.Error())
}
getConstraintQuery := fmt.Sprintf(query.GetConstraintStatement, dbName, autoIncrementColumn, tableName)
constraintResult := getRows(db, getConstraintQuery)
var constraintTable, constraintKey string
for constraintResult.Next() {
err = constraintResult.Scan(&constraintTable, &constraintKey)
if err != nil {
fmt.Println(err.Error())
}
currentDependentTable := dependentTable{TableName: constraintTable, ColumnName: constraintKey}
currentTable.addDependentTable(currentDependentTable)
}
}
result, _ := json.Marshal(currentTable)
fmt.Println(string(result))
}
}
func getRows(db *sql.DB, query string) *sql.Rows {
rows, err := db.Query(query)
if err != nil {
fmt.Println(err.Error())
}
return rows
}
func (mainTable *mainTable) addDependentTable(dependentTable dependentTable) []dependentTable {
mainTable.DependentTables = append(mainTable.DependentTables, dependentTable)
return mainTable.DependentTables
}