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