/
sql_writer.go
100 lines (93 loc) · 2.36 KB
/
sql_writer.go
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package main
import (
"fmt"
"strings"
)
// SqlWriter writes data in sql format using FileWriter
type SqlWriter struct {
fw FileWriter
dstFile string
dstDir string
}
// NewSqlWriter builds new SqlWriter
func NewSqlWriter(fw FileWriter, dstFile, dstDir string) *SqlWriter {
return &SqlWriter{
fw,
dstFile,
dstDir,
}
}
// WriteDDL writes SQL-query which creates tables - DDL
func (w *SqlWriter) WriteDDL(tableName string, ddl string) (err error) {
contents := "SET FOREIGN_KEY_CHECKS=0;\n"
contents += ddl + "\n"
contents += "SET FOREIGN_KEY_CHECKS=1;\n"
f, err := w.fw.getFileHandler(w.getFilename(tableName))
if err != nil {
return err
}
defer f.Close()
_, err = f.WriteString(contents)
if err != nil {
return fmt.Errorf("Error at writing DDL to file: %s", err)
}
return
}
// WriteRows writes result rows in sql-insert format
func (w *SqlWriter) WriteRows(tableName string, columns []string, rows []*map[string]interface{}) (err error) {
f, err := w.fw.getFileHandler(w.getFilename(tableName))
if err != nil {
return err
}
defer f.Close()
columnsNames := make([]string, 0)
for _, column := range columns {
columnsNames = append(columnsNames, "`"+column+"`")
}
for _, row := range rows {
values := make([]string, 0)
for _, field := range columns {
v := (*row)[field]
value := ""
switch typedValue := v.(type) {
case int:
value = fmt.Sprintf("%d", typedValue)
break
case int64:
value = fmt.Sprintf("%d", typedValue)
break
case float64:
value = fmt.Sprintf("%f", typedValue)
break
case string:
value = escapeString(typedValue)
break
case []uint8:
value = escapeString(fmt.Sprintf("%s", typedValue))
case nil:
value = "NULL"
default:
value = "UNDEFINED"
}
values = append(values, value)
}
insert := "INSERT INTO `" + tableName + "` (" + strings.Join(columnsNames, ", ") + ") " +
"VALUES (" + strings.Join(values, ", ") + ");\n"
_, err = f.WriteString(insert)
if err != nil {
return fmt.Errorf("Error at writing rows to file: %s", err)
}
}
return
}
func (w *SqlWriter) getFilename(tableName string) (filename string) {
if w.dstDir != "" {
return w.dstDir + "/" + tableName + ".sql"
}
return w.dstFile
}
func escapeString(str string) string {
str = strings.Replace(str, "\\", "\\\\", -1)
str = strings.Replace(str, "'", "\\'", -1)
return "'" + str + "'"
}