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code/base-project/base-go-v2/internal/db/query.go

@@ -0,0 +1,96 @@
+package db
+
+import (
+	"fmt"
+	"strings"
+)
+
+// ---------------- 通用查询方法 ----------------
+
+// GetOne 根据主键查询单条记录，返回 map[string]interface{}
+func GetOne(table string, pkColumn string, pkValue interface{}) (map[string]interface{}, error) {
+	query := fmt.Sprintf("SELECT * FROM %s WHERE %s=$1", table, pkColumn)
+
+	row := make(map[string]interface{})
+	err := DB.Get(&row, query, pkValue)
+	if err != nil {
+		return nil, err
+	}
+	return row, nil
+}
+
+// GetBatch 根据主键批量查询，返回 []map[string]interface{}
+func GetBatch(table string, pkColumn string, pkValues []interface{}) ([]map[string]interface{}, error) {
+	if len(pkValues) == 0 {
+		return nil, nil
+	}
+
+	var rows []map[string]interface{}
+
+	// 构建 IN 占位符
+	placeholders := make([]string, len(pkValues))
+	for i := range pkValues {
+		placeholders[i] = fmt.Sprintf("$%d", i+1)
+	}
+
+	query := fmt.Sprintf("SELECT * FROM %s WHERE %s IN (%s)", table, pkColumn, strings.Join(placeholders, ","))
+	err := DB.Select(&rows, query, pkValues...)
+	if err != nil {
+		return nil, err
+	}
+
+	return rows, nil
+}
+
+// Find 根据条件查询多条记录，可选排序
+// conditions: map[column]value, 将以 AND 拼接
+// orderBy: 可选排序字段，如 "created_at ASC"，为空默认 "b_id DESC"
+func Find(table string, conditions map[string]interface{}, orderBy ...string) ([]map[string]interface{}, error) {
+	if len(conditions) == 0 {
+		return nil, fmt.Errorf("查询条件不能为空")
+	}
+
+	var whereParts []string
+	var values []interface{}
+	i := 1
+	for k, v := range conditions {
+		whereParts = append(whereParts, fmt.Sprintf("%s=$%d", k, i))
+		values = append(values, v)
+		i++
+	}
+
+	query := fmt.Sprintf("SELECT * FROM %s WHERE %s", table, strings.Join(whereParts, " AND "))
+
+	order := "b_id DESC"
+	if len(orderBy) > 0 && orderBy[0] != "" {
+		order = orderBy[0]
+	}
+	query += " ORDER BY " + order
+
+	var rows []map[string]interface{}
+	err := DB.Select(&rows, query, values...)
+	if err != nil {
+		return nil, err
+	}
+
+	return rows, nil
+}
+
+// FindAll 查询整个表，可选排序
+func FindAll(table string, orderBy ...string) ([]map[string]interface{}, error) {
+	query := fmt.Sprintf("SELECT * FROM %s", table)
+
+	order := "b_id DESC"
+	if len(orderBy) > 0 && orderBy[0] != "" {
+		order = orderBy[0]
+	}
+	query += " ORDER BY " + order
+
+	var rows []map[string]interface{}
+	err := DB.Select(&rows, query)
+	if err != nil {
+		return nil, err
+	}
+
+	return rows, nil
+}