Merge branch 'query_builder'

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 0.1.3 (May 25, 2019)
+  - Added query builder helper
+
 ## 0.1.2 (May 23, 2019)
   - Added prepare and transactions
 

VERSION

@@ -1 +1 @@
-0.1.2
+0.1.3

query_builder.go

@@ -0,0 +1,37 @@
+package gomysql
+
+import (
+	"fmt"
+	"strings"
+)
+
+// PrepareInsertColumn prepares (?,?,?)
+func PrepareInsertColumn(columnCount int) string {
+	columnStr := `(`
+	for i := columnCount; i > 0; i-- {
+		columnStr += `?,`
+	}
+
+	if strings.HasSuffix(columnStr, ",") {
+		columnStr = columnStr[:len(columnStr)-len(",")]
+	}
+
+	columnStr += `)`
+
+	return columnStr
+}
+
+// PrepareBatchInsertColumns prepares (?,?,?),(?,?,?),(?,?,?)
+func PrepareBatchInsertColumns(rowCount int, columnCount int) string {
+	rowStr := ""
+
+	for i := rowCount; i > 0; i-- {
+		rowStr += fmt.Sprintf("%s,", PrepareInsertColumn(columnCount))
+	}
+
+	if strings.HasSuffix(rowStr, ",") {
+		rowStr = rowStr[:len(rowStr)-len(",")]
+	}
+
+	return rowStr
+}