public static string SelectSQL(Type entityType, string where = "")
{
string selectSQL;
if (!selectSQLCache.TryGetValue(entityType, out selectSQL)) //如果从缓存里面没有找到
{
var columns = entityType.GetProperties().Where(item =>
{
return(!EntityParser.IsIgnore(item));
}).Select(item => string.Format(" [{0}]", EntityParser.GetColumnName(item)));
if (!columns.Any())
{
throw new Exception(string.Format("类型{0}没有任何可以SELECT的列", entityType.FullName));
}
selectSQL = string.Format("SELECT{0} FROM {1}",
string.Join(",", columns),
EntityParser.GetTableName(entityType)
);
selectSQLCache.Add(entityType, selectSQL);
}
if (!string.IsNullOrEmpty(where))
{
where = " WHERE " + where;
}
return(selectSQL + where);
}
/// <summary>
/// 根据主键删除一个实体
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="key">主键的值</param>
public static void DeleteByKey <TEntity>(object key) where TEntity : SQLEntity
{
var keyInfo = EntityParser.GetKey(typeof(TEntity));
var keyName = keyInfo.KeyName;
var sql = SqlBuilder.DeleteSQL(EntityParser.GetTableName(typeof(TEntity)), string.Format("{0} = @{0}", keyName));
SQLServerHelper.ExecuteNonQuery(sql, new SqlParameter("@" + keyName, key));
}
public static string InsertSQL(Type entityType)
{
string sql;
if (!insertSQLCache.TryGetValue(entityType, out sql))
{
StringBuilder insert = new StringBuilder();
var key = EntityParser.GetKey(entityType);
if (!key.KeyConfig.UsePropertyForInsert)
{
insert.AppendLine(key.KeyConfig.KeyBeforeInsertSQL);
}
string tableName = EntityParser.GetTableName(entityType);
insert.AppendFormat("INSERT INTO [{0}]", tableName);
var properties = entityType.GetProperties().Where(item => !EntityParser.IsIgnore(item)).Select(item =>
{
string columnSQL = EntityParser.GetColumnName(item);
string valueSQL = "";
var config = EntityParser.GetColumnConfig(item);
if (config.UsePropertyForInsert)
{
valueSQL = " @" + item.Name;
}
else
{
valueSQL = config.InsertSQL;
}
return(new KeyValuePair <string, string>(columnSQL, valueSQL));
}).Where(item => !string.IsNullOrEmpty(item.Value));
insert.AppendFormat("({0})", string.Join(",", properties.Select(item => item.Key))).AppendLine();
insert.AppendFormat("VALUES({0})", string.Join(",", properties.Select(item => item.Value))).AppendLine();
if (!key.KeyConfig.UsePropertyForInsert)
{
insert.Append("SELECT ").AppendLine(key.KeyConfig.KeyAfterInsertSQL);
}
insertSQLCache.Add(entityType, insert.ToString());
return(insert.ToString());
}
return(sql);
}
/// <summary>
/// 将实体实例的属性的值更新到数据库中，必须指定主键
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="entity"></param>
/// <param name="updateToEntity"></param>
/// <returns></returns>
public static TEntity Update <TEntity>(TEntity entity, bool updateToEntity = true) where TEntity : SQLEntity
{
if (entity.EntityState == EntityState.NotInitialized)
{
throw new Exception("要更新的实体尚未初始化");
}
else if (entity.EntityState == EntityState.NotChanged)
{
return(entity);
}
else
{
var entityType = typeof(TEntity);
var key = EntityParser.GetKey(entityType); //找到主键属性
if (key == null)
{
throw new Exception("在实体类中没有找主键属性");
}
List <SqlParameter> parameters = new List <SqlParameter>();
var tableName = EntityParser.GetTableName(entityType);
StringBuilder update = new StringBuilder();
update.AppendFormat("UPDATE [{0}] SET ", tableName);
var flags = false;
foreach (var propertyName in entity) //遍历更改的属性
{
if (propertyName == key.PropertyName)
{
continue;
}
var propertyInfo = entityType.GetProperty(propertyName);
if (propertyInfo == null || EntityParser.IsIgnore(propertyInfo)) //如果找不到属性或不映射到数据库
{
continue;
}
var sqlPair = SqlBuilder.ColumnSqlForUpdate(entity, propertyInfo, parameters); //获取更新列值的sql语句
if (string.IsNullOrEmpty(sqlPair))
{
continue;
}
else
{
string columnName = EntityParser.GetColumnName(propertyInfo);
update.AppendFormat("{0} = {1}, ", columnName, sqlPair);
flags = true;
}
}
if (flags)
{
update.Remove(update.Length - 2, 2).AppendFormat(" ");
}
else
{
return(entity);
}
update.AppendFormat(" WHERE {0} = @{0}", key.KeyName);
var keyValue = key.Key.GetValue(entity, null); //获取主键的值
parameters.Add(new SqlParameter("@" + key.PropertyName, keyValue));
SQLServerHelper.ExecuteNonQuery(update.ToString(), parameters.ToArray()); //更新到数据库
entity.EntityState = EntityState.NotChanged; //未更改
if (updateToEntity)
{
//SingleByKey(keyValue, entity); //从数据库刷新属性
RefreshEntity(entity);
}
}
return(entity);
}
/// <summary>
/// 根据指定的条件删除多个实体
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="where">条件</param>
/// <param name="pms">参数</param>
public static void Delete <TEntity>(string where, params SqlParameter[] pms) where TEntity : SQLEntity
{
var sql = SqlBuilder.DeleteSQL(EntityParser.GetTableName(typeof(TEntity)), where);
SQLServerHelper.ExecuteNonQuery(sql, pms);
}
