forked from go-jet/jet
/
schema_meta_data.go
61 lines (45 loc) · 1.57 KB
/
schema_meta_data.go
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package metadata
import (
"database/sql"
"fmt"
"github.com/go-jet/jet/internal/utils"
)
// SchemaMetaData struct
type SchemaMetaData struct {
TablesMetaData []MetaData
ViewsMetaData []MetaData
EnumsMetaData []MetaData
}
// IsEmpty returns true if schema info does not contain any table, views or enums metadata
func (s SchemaMetaData) IsEmpty() bool {
return len(s.TablesMetaData) == 0 && len(s.ViewsMetaData) == 0 && len(s.EnumsMetaData) == 0
}
const (
baseTable = "BASE TABLE"
view = "VIEW"
)
// GetSchemaMetaData returns schema information from db connection.
func GetSchemaMetaData(db *sql.DB, schemaName string, querySet DialectQuerySet) (schemaInfo SchemaMetaData) {
schemaInfo.TablesMetaData = getTablesMetaData(db, querySet, schemaName, baseTable)
schemaInfo.ViewsMetaData = getTablesMetaData(db, querySet, schemaName, view)
schemaInfo.EnumsMetaData = querySet.GetEnumsMetaData(db, schemaName)
fmt.Println(" FOUND", len(schemaInfo.TablesMetaData), "table(s),", len(schemaInfo.ViewsMetaData), "view(s),",
len(schemaInfo.EnumsMetaData), "enum(s)")
return
}
func getTablesMetaData(db *sql.DB, querySet DialectQuerySet, schemaName, tableType string) []MetaData {
rows, err := db.Query(querySet.ListOfTablesQuery(), schemaName, tableType)
utils.PanicOnError(err)
defer rows.Close()
ret := []MetaData{}
for rows.Next() {
var tableName string
err = rows.Scan(&tableName)
utils.PanicOnError(err)
tableInfo := GetTableMetaData(db, querySet, schemaName, tableName)
ret = append(ret, tableInfo)
}
err = rows.Err()
utils.PanicOnError(err)
return ret
}