使用Dapper读取Oracle多个结果集
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Dapper对SQL Server支持很好,但对于Oracle有些用法不一样,需要自己进行特殊处理。
1、首先要自定义一个Oracle参数类
1 public class OracleDynamicParameters : SqlMapper.IDynamicParameters 2 { 3 private readonly DynamicParameters dynamicParameters = new DynamicParameters(); 4 5 private readonly List<OracleParameter> oracleParameters = new List<OracleParameter>(); 6 7 public void Add(string name, OracleDbType oracleDbType, ParameterDirection direction, object value = null, int? size = null) 8 { 9 OracleParameter oracleParameter; 10 if (size.HasValue) 11 { 12 oracleParameter = new OracleParameter(name, oracleDbType, size.Value, value, direction); 13 } 14 else 15 { 16 oracleParameter = new OracleParameter(name, oracleDbType, value, direction); 17 } 18 19 oracleParameters.Add(oracleParameter); 20 } 21 22 public void Add(string name, OracleDbType oracleDbType, ParameterDirection direction) 23 { 24 var oracleParameter = new OracleParameter(name, oracleDbType, direction); 25 oracleParameters.Add(oracleParameter); 26 } 27 28 public void AddParameters(IDbCommand command, SqlMapper.Identity identity) 29 { 30 ((SqlMapper.IDynamicParameters)dynamicParameters).AddParameters(command, identity); 31 32 var oracleCommand = command as OracleCommand; 33 34 if (oracleCommand != null) 35 { 36 oracleCommand.Parameters.AddRange(oracleParameters.ToArray()); 37 } 38 } 39 }
2、对于一个sql语句中的多个结果集处理
string sql = @" begin open :rslt1 for select * from t_um_event where rownum<10 and c_fid>:fid; open :rslt2 for select count(*) as count from t_um_event; end; "; OracleDynamicParameters dynParams = new OracleDynamicParameters(); dynParams.Add(":rslt1", OracleDbType.RefCursor, ParameterDirection.Output); dynParams.Add(":rslt2", OracleDbType.RefCursor, ParameterDirection.Output); dynParams.Add(":fid", OracleDbType.Int64, ParameterDirection.Input, 1000); using (var muti = cn.QueryMultiple(sql, param: dynParams)) { List<TestClass> firstRes = muti.Read<TestClass>().ToList(); RecordCount secondRes = muti.ReadFirstOrDefault<RecordCount>(); }
class TestClass { public string C_ID { get; set; } public DateTime? C_REG_TIME { get; set; } public string C_Title { get; set; } } class RecordCount { public int Count { get; set; } }
2、对于oracle存储过程的多个结果集处理,存储过程定义
create or replace package pkg_test_dapper is TYPE t_cursor IS REF CURSOR; procedure p_get_list(cur_out1 out t_cursor, p_fid int, cur_out2 out t_cursor); procedure p_get_count(cur_out out t_cursor); end pkg_test_dapper; / create or replace package body pkg_test_dapper is procedure p_get_list(cur_out1 out t_cursor, p_fid int, cur_out2 out t_cursor) as begin open cur_out1 for select * from t_um_event where rownum < 10 and c_fid > p_fid; open cur_out2 for select count(*) as count from t_um_event; end; procedure p_get_count(cur_out out t_cursor) as begin open cur_out for select count(*) as count from t_um_event; end; end pkg_test_dapper; /
c#中用dapper调用存储过程返回oracle多个结果集
using (IDbConnection cn = new OracleConnection(ConfigurationManager.ConnectionStrings["ZWGCDB"].ConnectionString)) { TestClass Evt = cn.QueryFirstOrDefault<TestClass>("select * from t_um_event where c_id=:Id", new { id = "1BA2BF30-658A-4A79-A179-05A77C527150" }); //int cnt = cn.Execute("update t_um_event set c_reg_time=:reg_time where c_id=:id", new { id = "CEA00DA2-79D2-48CC-A9E1-D3CBB3842E54", reg_time = DateTime.Now }); OracleDynamicParameters dynParams = new OracleDynamicParameters(); dynParams.Add("cur_out1", OracleDbType.RefCursor, ParameterDirection.Output); dynParams.Add("cur_out2", OracleDbType.RefCursor, ParameterDirection.Output); dynParams.Add("p_fid", OracleDbType.Int64, ParameterDirection.Input, 1000); using (var muti = cn.QueryMultiple("pkg_test_dapper.p_get_list", dynParams, commandType: CommandType.StoredProcedure)) { List<TestClass> firstRes = muti.Read<TestClass>().ToList(); RecordCount secondRes = muti.ReadFirstOrDefault<RecordCount>(); } }
参考:http://stackoverflow.com/questions/18772781/using-dapper-querymultiple-in-oracle
使用到的包文件如下:
<?xml version="1.0" encoding="utf-8"?> <packages> <package id="Dapper" version="1.50.2" targetFramework="net40" /> <package id="Oracle.ManagedDataAccess" version="12.1.24160419" targetFramework="net40" /> </packages>
自:http://weiweictgu.cnblogs.com/
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