diff --git a/database/explain.go b/database/explain.go
index 1a0d8173c979635465a1f2fd19060ff964a9a124..3520b66a336fa06718bd576e7d1175b598db42f1 100644
--- a/database/explain.go
+++ b/database/explain.go
@@ -1031,9 +1031,6 @@ func (db *Connector) Explain(sql string, explainType int, formatType int) (exp *
 	if err != nil {
 		return exp, err
 	}
-	if res.Error != nil {
-		return exp, res.Error
-	}
 
 	// 解析mysql结果，输出ExplainInfo
 	exp, err = ParseExplainResult(res, formatType)
diff --git a/database/mysql.go b/database/mysql.go
index 68aa971e80f121b6168a46bb2438f0feafd3b88b..a9140df392cdc4765601ed539769357715454355 100644
--- a/database/mysql.go
+++ b/database/mysql.go
@@ -93,6 +93,9 @@ func (db *Connector) Query(sql string, params ...interface{}) (QueryResult, erro
 		}
 	}
 
+	if res.Error != nil && err == nil {
+		err = res.Error
+	}
 	return res, err
 }
 
@@ -101,8 +104,8 @@ func (db *Connector) Version() (int, error) {
 	version := 99999
 	// 从数据库中获取版本信息
 	res, err := db.Query("select @@version")
-	if err != nil || res.Error != nil {
-		common.Log.Warn("(db *Connector) Version() Error: %v, MySQL Error: %v", err, res.Error)
+	if err != nil{
+		common.Log.Warn("(db *Connector) Version() Error: %v", err)
 		return version, err
 	}
 
diff --git a/database/show.go b/database/show.go
index 7628bea9f910b6e58b9a0861dc2a749a029505c1..ba3f4be5eb384b3527c1bd488ede0e7b1765bb69 100644
--- a/database/show.go
+++ b/database/show.go
@@ -91,9 +91,6 @@ func (db *Connector) ShowTables() ([]string, error) {
 	if err != nil {
 		return []string{}, err
 	}
-	if res.Error != nil {
-		return []string{}, res.Error
-	}
 
 	// 获取值
 	var tables []string
@@ -118,9 +115,6 @@ func (db *Connector) ShowTableStatus(tableName string) (*TableStatInfo, error) {
 	if err != nil {
 		return tbStatus, err
 	}
-	if res.Error != nil {
-		return tbStatus, res.Error
-	}
 
 	ts := tableStatusRow{}
 	statusFields := make([]interface{}, 0)
@@ -200,9 +194,6 @@ func (db *Connector) ShowIndex(tableName string) (*TableIndexInfo, error) {
 	if err != nil {
 		return nil, err
 	}
-	if res.Error != nil {
-		return nil, res.Error
-	}
 
 	// 获取值
 	for res.Rows.Next() {
@@ -322,9 +313,6 @@ func (db *Connector) ShowColumns(tableName string) (*TableDesc, error) {
 	if err != nil {
 		return nil, err
 	}
-	if res.Error != nil {
-		return nil, res.Error
-	}
 
 	// 获取值
 	for res.Rows.Next() {
@@ -359,9 +347,6 @@ func (db *Connector) showCreate(createType, name string) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	if res.Error != nil {
-		return "", res.Error
-	}
 
 	// 获取 CREATE TABLE 语句
 	var tableName, createTable string
@@ -444,10 +429,6 @@ func (db *Connector) FindColumn(name, dbName string, tables ...string) ([]*commo
 		common.Log.Error("(db *Connector) FindColumn Error : ", err)
 		return columns, err
 	}
-	if res.Error != nil {
-		common.Log.Error("(db *Connector) FindColumn Error : ", res.Error)
-		return columns, res.Error
-	}
 
 	var col common.Column
 	for res.Rows.Next() {
@@ -473,10 +454,6 @@ func (db *Connector) FindColumn(name, dbName string, tables ...string) ([]*commo
 				common.Log.Error("(db *Connector) FindColumn Error : ", err)
 				return columns, err
 			}
-			if res.Error != nil {
-				common.Log.Error("(db *Connector) FindColumn Error : ", res.Error)
-				return columns, res.Error
-			}
 
 			var tbCollation string
 			if newRes.Rows.Next() {
@@ -506,10 +483,6 @@ func (db *Connector) IsForeignKey(dbName, tbName, column string) bool {
 		common.Log.Error("IsForeignKey, Error: %s", err.Error())
 		return false
 	}
-	if res.Error != nil {
-		common.Log.Error("IsForeignKey, Error: %s", res.Error.Error())
-		return false
-	}
 	if res.Rows.Next() {
 		return true
 	}
@@ -532,9 +505,7 @@ type ReferenceValue struct {
 // ShowReference 查找所有的外键信息
 func (db *Connector) ShowReference(dbName string, tbName ...string) ([]ReferenceValue, error) {
 	var referenceValues []ReferenceValue
-	sql := `SELECT C.REFERENCED_TABLE_SCHEMA,C.REFERENCED_TABLE_NAME,C.TABLE_SCHEMA,C.TABLE_NAME,C.CONSTRAINT_NAME
-FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE C JOIN INFORMATION_SCHEMA. TABLES T ON T.TABLE_NAME = C.TABLE_NAME
-WHERE C.REFERENCED_TABLE_NAME IS NOT NULL`
+	sql := `SELECT DISTINCT C.REFERENCED_TABLE_SCHEMA,C.REFERENCED_TABLE_NAME,C.TABLE_SCHEMA,C.TABLE_NAME,C.CONSTRAINT_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE C JOIN INFORMATION_SCHEMA. TABLES T ON T.TABLE_NAME = C.TABLE_NAME WHERE C.REFERENCED_TABLE_NAME IS NOT NULL`
 	sql = sql + fmt.Sprintf(` AND C.TABLE_SCHEMA = "%s"`, dbName)
 
 	if len(tbName) > 0 {
@@ -548,9 +519,6 @@ WHERE C.REFERENCED_TABLE_NAME IS NOT NULL`
 	if err != nil {
 		return referenceValues, err
 	}
-	if res.Error != nil {
-		return referenceValues, res.Error
-	}
 
 	// 获取值
 	for res.Rows.Next() {
diff --git a/env/env.go b/env/env.go
index cc21a03ccae7bc946621569ebed1b6c9ee33a7a3..7ae1c5120c84f1015a14ea3a4d6b86972de297ec 100644
--- a/env/env.go
+++ b/env/env.go
@@ -139,7 +139,7 @@ func (ve VirtualEnv) CleanUp() bool {
 		common.Log.Debug("CleanUp ...")
 		for db := range ve.hash2Db {
 			ve.Database = db
-			_, err := ve.Query("drop database %s", db)
+			_, err := ve.Query(fmt.Sprintf("drop database %s", db))
 			if err != nil {
 				common.Log.Error("CleanUp failed Error: %s", err)
 				return false
@@ -178,7 +178,7 @@ func (ve *VirtualEnv) CleanupTestDatabase() {
 
 		subHour := time.Since(pastTime).Hours()
 		if subHour > float64(minHour) {
-			if _, err := ve.Query("drop database %s", testDatabase); err != nil {
+			if _, err := ve.Query(fmt.Sprintf("drop database %s", testDatabase)); err != nil {
 				common.Log.Error("CleanupTestDatabase failed Error: %s", err.Error())
 				continue
 			}