C# 使用 Dapper 实现 SQLite 增删改查
2024-08-26 12:34:18
Dapper 是一款非常不错的轻型 ORM 框架，使用起来非常方便，经常使用 EF 框架的人几乎感觉不到差别，下面是自己写的 Sqlite 通用帮助类；
数据连接类；
public class SQLiteBaseRepository
{
public static string DbFile
{
get {
return Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "VideoInfo.db");
}
}
public static SQLiteConnection SimpleDbConnection()
{ string connString = string.Format("Data Source={0};Password=******;", DbFile);
return new SQLiteConnection(connString);
}
}
数据库访问帮助类
public class SQLiteDbHelper : IDisposable
{
/// <summary>
/// 常量；
/// </summary>
const string INSERT_TABLE_ITEM_VALUE = "insert into {0} ({1}) values ({2})";
const string DELETE_TABLE_WHERE = "delete from {0} where {1}";
const string UPDATE_TABLE_EDITITEM = "update {0} set {1}";
const string UPDATE_TABLE_EDITITEM_WHERE = "update {0} set {1} where {2}";
const string Query_ITEM_TABLE_WHERE = "select {0} from {1} where {2}"; private SQLiteConnection conn; public SQLiteDbHelper()
{
conn = openDataConnection();
}
/// <summary>
/// 打开数据库链接；
/// </summary>
/// <returns></returns>
private SQLiteConnection openDataConnection()
{
var conn = SqLiteBaseRepository.SimpleDbConnection();
if (conn.State == ConnectionState.Closed)
{
conn.Open();
}
return conn;
}
/// <summary>
/// 1.1 新增实体；
/// </summary>
/// <typeparam name="T">实体类</typeparam>
/// <param name="model">实体</param>
/// <param name="autoPrimaryKey">自增主键名称</param>
/// <returns></returns>
public int Add<T>(T model, string autoPrimaryKey = "id")
{
var insertSql = GetInsertSql<T>(model,autoPrimaryKey);
return conn.Execute(insertSql);
}
/// <summary>
/// 批量新增
/// </summary>
/// <typeparam name="T">实休类</typeparam>
/// <param name="addData">实体数据列表</param>
/// <param name="autoPrimaryKey">自增主键名称</param>
/// <returns></returns>
public int Adds<T>(List<T> models, string autoPrimaryKey = "id")
{
var type = typeof(T);
int resultN = ;
var transaction = conn.BeginTransaction();
try
{
models.ForEach(d =>
{
var insertSql = GetInsertSql<T>(d);
resultN += conn.Execute(insertSql);
});
transaction.Commit();
}
catch (Exception)
{
resultN = ;
transaction.Rollback();
}
return resultN;
}
/// <summary>
/// 删除
/// </summary>
/// <typeparam name="T">实体类</typeparam>
/// <param name="where">删除条件</param>
/// <returns></returns>
public int Delete<T>(string where)
{
var type = typeof(T);
string sqlStr = string.Format(DELETE_TABLE_WHERE, type.Name, where);
return conn.Execute(sqlStr);
}
/// <summary>
/// 删除
/// </summary>
/// <param name="tableName"></param>
/// <param name="where"></param>
/// <returns></returns>
public int Delete(string tableName, string where)
{
string sqlStr = string.Format(DELETE_TABLE_WHERE,tableName,where);
return conn.Execute(sqlStr);
}
/// <summary>
/// 修改;
/// </summary>
/// <typeparam name="T">实体 Type </typeparam>
/// <param name="model">实体</param>
/// <param name="where">修改条件</param>
/// <param name="attrs">要修改的实休属性数组</param>
/// <returns></returns>
public int Edit<T>(T model, string where, params string[] attrs)
{
var sqlStr = GetUpdateSql<T>(model, where, attrs);
return conn.Execute(sqlStr);
} /// <summary>
/// 根据条件查询单一实体;
/// </summary>
/// <typeparam name="T">实体类</typeparam>
/// <param name="where">查询条件；</param>
/// <param name="attrs">要查询的字段(传入 * 为查询所有字段。)</param>
/// <returns></returns>
public T QeryByWhere<T>(string where,params string[] attrs)
{
Type type = typeof(T);
string item = attrs.Length == && attrs[] == "*" ? "*" : string.Join(",", attrs);
var sqlStr = string.Format(Query_ITEM_TABLE_WHERE, item, type.Name, where);
return conn.Query<T>(sqlStr).FirstOrDefault();
} /// <summary>
/// 根据条件查询符合条件的所有实体;
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="where"></param>
/// <returns></returns>
public List<T> QueryMultiByWhere<T>(string where)
{
Type type = typeof(T);
var sqlStr = string.Format(Query_ITEM_TABLE_WHERE, "*", type.Name, where);
return conn.Query<T>(sqlStr).ToList();
} /// <summary>
/// 生成新增 sql 语句；
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="model"></param>
/// <param name="autoPrimaryKey"></param>
/// <returns></returns>
private string GetInsertSql<T>(T model, string autoPrimaryKey = "id")
{
Type t = typeof(T);
var propertyInfo = t.GetProperties();
var proDic = propertyInfo.Where(s => !s.Name.Equals(autoPrimaryKey, StringComparison.InvariantCultureIgnoreCase))
.Select(s => new
{
key = s.Name,
value = GetValue<T>(s, model)
})
.ToDictionary(s => s.key, s => s.value);
proDic = proDic.Where(s => s.Value != "''").ToDictionary(s => s.Key, s => s.Value);
var items = string.Join(",", proDic.Keys);
var values = string.Join(",", proDic.Values);
return string.Format(INSERT_TABLE_ITEM_VALUE,t.Name,items,values);
} /// <summary>
/// 获取属性值；
/// </summary>
/// <typeparam name="T">实体类</typeparam>
/// <param name="info">字段属性信息</param>
/// <param name="model">实体</param>
/// <returns></returns>
private string GetValue<T>(PropertyInfo info,T model)
{
Type type = info.PropertyType;
var tempStr = string.Empty;
if (type == typeof(string))
{
tempStr = string.Format("'{0}'",info.GetValue(model));
return tempStr;
}
if (type == typeof(DateTime))
{
tempStr = string.Format("'{0}'", ((DateTime)info.GetValue(model)).ToString("s"));
return tempStr;
}
if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
{
var types = type.GetGenericArguments();
if (types[] == typeof(DateTime))
{
tempStr = string.Format("'{0}'", ((DateTime)info.GetValue(model)).ToString("s"));
}
tempStr = string.Format("'{0}'",info.GetValue(model));
return tempStr;
}
tempStr = info.GetValue(model).ToString();
return tempStr;
} /// <summary>
/// 生成更新 sql 语句；
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="model"></param>
/// <param name="pro"></param>
/// <param name="attrs"></param>
/// <returns></returns>
private string GetUpdateSql<T>(T model,string where, params string[] attrs)
{
Type t = typeof(T);
var propertyInfo = t.GetProperties();
var updateInfo = propertyInfo
.Where(s => attrs.Contains(s.Name))
.Select(s =>
{
if (s.PropertyType == typeof(string))
{
return string.Format("{0}='{1}'",s.Name,s.GetValue(model));
}
if (s.PropertyType == typeof(DateTime))
{
return string.Format("{0}='{1}'",s.Name,((DateTime)s.GetValue(model)).ToString("s"));
}
if (s.PropertyType.IsGenericType && s.PropertyType.GetGenericTypeDefinition() == typeof(Nullable<>))
{
Type[] types = s.PropertyType.GetGenericArguments();
if (types[] == typeof(DateTime))
{
return string.Format("{0}='{1}'", s.Name, ((DateTime)s.GetValue(model)).ToString("s"));
}
return string.Format("{0}={1}", s.Name, s.GetValue(model));
}
return string.Format("{0}={1}", s.Name, s.GetValue(model));
})
.ToArray();
var setStr = string.Join(",",updateInfo);
var sqlStr = string.Format(UPDATE_TABLE_EDITITEM_WHERE, t.Name, setStr, where);
return sqlStr;
}
/// <summary>
/// 释放数据连接；
/// </summary>
public void Dispose()
{
conn.Close();
conn.Dispose();
} }
https://www.cnblogs.com/llsfast/p/7883357.html
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