public async Task <int> UpdateIfNotExitsAsync <T>(T entity, Expression <Func <T, bool> > where)
{
var entityInfo = MyEntityContainer.Get(typeof(T));
var resolver = new EditConditionResolver <T>(entityInfo);
var result = resolver.Resolve(where.Body);
var condition = result.Condition;
var parameters = result.Parameters;
parameters.Add(entity);
condition = string.IsNullOrWhiteSpace(condition) ? "1=1" : condition;
var sqlBuilder = new SqlServerBuilder();
var sql = sqlBuilder.Update(entityInfo, "");
sql += $" AND NOT EXISTS (SELECT 1 FROM [{entityInfo.TableName}] WHERE {condition})";
var command = new SqlCommand(sql);
command.Parameters.AddRange(parameters.Parameters);
using (var conn = new SqlConnection(_connectionString))
{
conn.Open();
command.Connection = conn;
return(await command.ExecuteNonQueryAsync());
}
}
/// <summary>
/// 如果不满足条件则创建一个实体，
/// 如限制用户名不能重复 InsertIfNotExist(user, u => u.Name == user.Name)
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="entity">要创建的实体</param>
/// <param name="where">条件</param>
/// <returns>新生成记录的ID，若失败返回0</returns>
public int InsertIfNotExists <T>(T entity, Expression <Func <T, bool> > where) where T : class, IEntity, new()
{
if (where == null)
{
return(Insert(entity));
}
var entityInfo = MyEntityContainer.Get(typeof(T));
var resolver = new EditConditionResolver <T>(entityInfo);
var result = resolver.Resolve(@where.Body);
var condition = result.Condition;
var parameters = result.Parameters;
parameters.Add(entity);
condition = string.IsNullOrWhiteSpace(condition) ? "1=1" : condition;
var sqlBuilder = new SqlServerBuilder();
var sql = sqlBuilder.InsertIfNotExists(entityInfo, condition);
var command = new SqlCommand(sql);
command.Parameters.AddRange(parameters.Parameters);
using (var conn = new SqlConnection(_connectionString))
{
conn.Open();
command.Connection = conn;
var obj = command.ExecuteScalar();
if (obj != DBNull.Value)
{
entity.Id = Convert.ToInt32(obj);
}
return(entity.Id);
}
}
public async Task <int> DeleteAsync <T>(Expression <Func <T, bool> > expression, bool isForce) where T : IEntity
{
var entityInfo = MyEntityContainer.Get(typeof(T));
var resolver = new EditConditionResolver <T>(entityInfo);
var result = resolver.Resolve(expression.Body);
var condition = result.Condition;
var parameters = result.Parameters;
condition = string.IsNullOrWhiteSpace(condition) ? "1=1" : condition;
string sql;
if (isForce || !entityInfo.IsSoftDelete)
{
sql =
$"DELETE [{entityInfo.TableName}] WHERE {condition}";
}
else
{
sql =
$"UPDATE [{entityInfo.TableName}] SET IsDel=1 WHERE {condition}";
}
using (var conn = new SqlConnection(_connectionString))
{
conn.Open();
var command = new SqlCommand(sql, conn);
command.Parameters.AddRange(parameters.Parameters);
return(await command.ExecuteNonQueryAsync());
}
}
public async Task <int> UpdateAsync <T>(Expression <Func <T, bool> > expression, DbKvs kvs)
{
var entityInfo = MyEntityContainer.Get(typeof(T));
var setProperties = kvs.Where(kv => kv.Key != "Id").Select(kv => kv.Key);
var includeProperties = entityInfo.Properties.Where(p => setProperties.Contains(p.Name)).ToList();
if (includeProperties.Count == 0)
{
return(0);
}
string sql;
List <SqlParameter> parameters;
if (expression == null)
{
sql =
$"UPDATE [{entityInfo.TableName}] SET {string.Join(",", includeProperties.Select(p => $"{p.FieldName}=@{p.Name}"))} WHERE Id=@Id";
parameters = kvs.ToSqlParameters();
}
else
{
var resolver = new EditConditionResolver <T>(entityInfo);
var result = resolver.Resolve(expression.Body);
var where = result.Condition;
var whereParameters = result.Parameters;
parameters = kvs.ToSqlParameters();
parameters.AddRange(whereParameters.Parameters);
where = string.IsNullOrWhiteSpace(where) ? "1=1" : where;
sql =
$"UPDATE [{entityInfo.TableName}] SET {string.Join(",", includeProperties.Select(p => $"{p.FieldName}=@{p.Name}"))} WHERE {where}";
}
using (var conn = new SqlConnection(_connectionString))
{
conn.Open();
var command = new SqlCommand(sql, conn);
command.Parameters.AddRange(parameters.ToArray());
return(await command.ExecuteNonQueryAsync());
}
}
public async Task <int> GetCountAsync <T>(Expression <Func <T, bool> > expression = null) where T : class, IEntity, new()
{
var entityInfo = MyEntityContainer.Get(typeof(T));
if (expression == null)
{
var sql = $"SELECT COUNT(0) FROM [{entityInfo.TableName}]";
using (var conn = new SqlConnection(_connectionString))
{
conn.Open();
var command = new SqlCommand(sql, conn);
return((int)command.ExecuteScalar());
}
}
else
{
var resolver = new EditConditionResolver <T>(entityInfo);
var result = resolver.Resolve(expression.Body);
var condition = result.Condition;
var parameters = result.Parameters;
condition = string.IsNullOrWhiteSpace(condition) ? "1=1" : condition;
var sql = $"SELECT COUNT(0) FROM [{entityInfo.TableName}] WHERE [{condition}]";
using (var conn = new SqlConnection(_connectionString))
{
conn.Open();
var command = new SqlCommand(sql, conn);
command.Parameters.AddRange(parameters.Parameters);
var obj = await command.ExecuteScalarAsync();
if (obj == null)
{
return(0);
}
return((int)obj);
}
}
}