/// <summary>
/// 通过operationType将实体对象转换成参数化的Sql语句
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="operationType">数据库操作类型</param>
/// <param name="entity">实体对象(INSERT,UPDATE时使用)</param>
/// <param name="paramsStartIndex">参数化Sql开始的索引</param>
/// <param name="dynamicParameters">参数列表(INSERT,UPDATE,DELETE,SELECT时使用)</param>
/// <returns></returns>
private string ToParameterizedSqlString <T>(DbOperationType operationType, T entity, int paramsStartIndex, ref DynamicParameters dynamicParameters)
where T : class
{
Type t = typeof(T);
MapperPropertyInfo[] mappers = SqlServerUtilities.GetMapperPropertyInfo <T>(entity);
string[] fields = new string[0];
string[] parameterized = new string[0];
string sql = string.Empty;
switch (operationType)
{
case DbOperationType.INSERT:
parameterized = SqlServerUtilities.GetParameterized(mappers, paramsStartIndex, ref dynamicParameters, out fields);
sql = string.Format("INSERT INTO dbo.[{0}] ({1}) VALUES ({2})",
t.Name,
fields.ToString(p => "[" + p + "]"),
parameterized.ToString(null)
);
break;
case DbOperationType.UPDATE:
parameterized = SqlServerUtilities.GetParameterized(mappers, paramsStartIndex, ref dynamicParameters, out fields);
sql = string.Format("UPDATE dbo.[{0}] SET {1}",
t.Name,
fields.Combine(parameterized, (p, q) => "[" + p + "]" + "=" + q).ToString(null)
);
break;
case DbOperationType.DELETE:
sql = string.Format("DELETE FROM dbo.[{0}]", t.Name);
break;
case DbOperationType.SELECT:
fields = SqlServerUtilities.GetFields(mappers);
sql = string.Format("SELECT {0} FROM dbo.[{1}] (NOLOCK)",
fields.ToString(p => "[" + p + "]"),
t.Name
);
break;
case DbOperationType.COUNT:
sql = string.Format("SELECT COUNT(*) FROM dbo.[{0}] (NOLOCK)", t.Name);
break;
case DbOperationType.EXISTS:
sql = string.Format("SELECT 1 FROM dbo.[{0}] (NOLOCK)", t.Name);
break;
}
return(sql);
}
