增加左/右连接方法

chain.go

@@ -145,6 +145,27 @@ func (this *Query) Join(join []string) *Query {
 	this.join = append(this.join, join)
 	return this
 }
+
+/**
+ * 左连接
+ * 2023/08/10
+ * gz
+ */
+func (this *Query) LeftJoin(table_name string, condition string) *Query {
+	this.join = append(this.join, []string{table_name, condition, "left"})
+	return this
+}
+
+/**
+ * 右连接
+ * 2023/08/10
+ * gz
+ */
+func (this *Query) RightJoin(table_name string, condition string) *Query {
+	this.join = append(this.join, []string{table_name, condition, "right"})
+	return this
+}
+
 func (this *Query) Data(data string) *Query {
 	this.data = append(this.data, data)
 	return this
@@ -290,15 +311,17 @@ func (this *Query) BuildSelectSql() (map[string]interface{}, error) {
 	sql = helper.StringJoin(sql, " from ", table)
 
 	if len(this.join) > 0 {
+		join_type := "left"
 		for _, joinitem := range this.join {
 			if len(joinitem) < 2 {
 				continue
 			}
 			if len(joinitem) == 3 {
-				sql = helper.StringJoin(sql, " ", joinitem[2], " join ", getTableName(this.dbname, joinitem[0], this.dbtype), " on ", joinitem[1])
+				join_type = joinitem[2]
 			} else { //默认左连接
-				sql = helper.StringJoin(sql, " left join ", getTableName(this.dbname, joinitem[0], this.dbtype), " on ", joinitem[1])
+				join_type = "left"
 			}
+			sql = helper.StringJoin(sql, " ", join_type, " join ", getTableName(this.dbname, joinitem[0], this.dbtype), " on ", joinitem[1])
 		}
 	}
 	if len(this.where) > 0 || len(this.where_or) > 0 {

transaction_chain.go

@@ -147,6 +147,26 @@ func (this *TxQuery) Join(join []string) *TxQuery {
 	this.join = append(this.join, join)
 	return this
 }
+
+/**
+ * 左连接
+ * 2023/08/10
+ * gz
+ */
+func (this *TxQuery) LeftJoin(table_name string, condition string) *TxQuery {
+	this.join = append(this.join, []string{table_name, condition, "left"})
+	return this
+}
+
+/**
+ * 右连接
+ * 2023/08/10
+ * gz
+ */
+func (this *TxQuery) RightJoin(table_name string, condition string) *TxQuery {
+	this.join = append(this.join, []string{table_name, condition, "right"})
+	return this
+}
 func (this *TxQuery) Data(data string) *TxQuery {
 	this.data = append(this.data, data)
 	return this
@@ -180,7 +200,7 @@ func (this *TxQuery) Clean() *TxQuery {
 	return this
 }
 
-//构造子查询
+// 构造子查询
 func (this *TxQuery) BuildSelectSql() (map[string]interface{}, error) {
 	if this.dbname == "" && this.table == "" {
 		return nil, errors.New("参数错误，没有数据表")
@@ -278,7 +298,7 @@ func (this *TxQuery) BuildSelectSql() (map[string]interface{}, error) {
 	}, nil
 }
 
-//获取表格信息
+// 获取表格信息
 func (this *TxQuery) GetTableInfo(table string) (map[string]interface{}, error) {
 	field := []string{
 		"COLUMN_NAME",    //字段名