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C#连接Oracle数据库通过存储过程操作数据库 收藏 此文于2011-06-07被推荐到CSDN首页
此文于2011-06-08被推荐到CSDN首页
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之前笔者一直用C#连接SQL Server数据库。近期由于工作需要，需要用C#连接Oracle数据库，并且要通过存储过程，来操作数据库中的数据，实现增、删、改、查(有分页功能)功能。并且，为了今后对数据库扩展方便，对现在的代码改动最小的情况下，实现数据库的平稳切换，必须采用OleDB的方式连接Oracle数据库、操作存储过程。
首先去网上搜索资料，确实找到了很多C#连接Oracle数据库，和用存储过程操作数据库的资料。但是仔细研究发现，清一色的全部是使用OracleClient(Oracle专用驱动)的方式对Oracle数据库及存储过程进行操作。没办法，只能自己动手、丰衣足食。经过3天左右的辛苦努力，终于实现了用OleDB连接Oracle数据库，并且用存储过程来操作Oracle数据库的方法。下面将实现方式总结一下。
用OleDB操作Oracle存储过程，有几个难题；
1、 返回记录集，也就是Oracle的游标；
2、 对于某些特殊的应用，有可能需要返回多个记录集；
3、 将存储过程中的数据，通过输出参数的形式返回给程序(因为要做分页，需要将记录数输出来)；
4、 对Text大文本字段(对应Oracle的数据类型是CLOB)的增、改、查操作；
5、 对特殊字符的查询，如查询文本中是否包含“%”、“\”、“’”、“_”等符号；
接下来，主要针对以上问题，进行介绍；
一、连接Oracle数据库
连接Oracle数据库，主要有2种方式。一种是使用微软的数据库驱动进行连接；另外一种是使用Oracle的数据库驱动进行连接；
经过在网上查资料，说是Oracle的数据库驱动，中文可能会出现乱码；微软的驱动虽然中文没有乱码，但是对于CLOB类型的字段，无法操作；经过对比，决定使用Oracle的数据库驱动。因为应用中，肯定要有CLOB类型的字段操作；但是经过测试，未发现中文出现乱码的情况；
Ø Oracle数据库连接方式：
Provider=OraOLEDB.Oracle.1;User ID=username;password=dbpassword;Data Source=databasename;Persist Security Info=True;Extended Properties='PLSQLRSet=1';
Extended Properties='PLSQLRSet=1'
注意：上面这个属性一定要带上，否则无法操作有返回游标参数的存储过程；
Ø 微软的数据库连接方式：
Provider=MSDAORA.1;Data Source=allrun;User ID=allrunadmin;Password=allrun;Persist Security Info=True;
建议使用Oracle数据库的连接方式。
二、存储过程，返回多个记录集
Oracle存储过程脚本：
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--包
create or replace
PACKAGE "DESKTOP_PAGE_PACKAGE" as
TYPE T_CURSOR IS REF CURSOR;
procedure GetDesktopPage (RecordTotal OUT NUMBER, curRecordTotal OUT T_CURSOR, curDesktopPage OUT T_CURSOR);
end;
--包体
create or replace
PACKAGE BODY "DESKTOP_PAGE_PACKAGE" as
procedure GetDesktopPage (RecordTotal OUT NUMBER, curRecordTotal OUT T_CURSOR, curDesktopPage OUT T_CURSOR) is
begin
--记录集1
OPEN curRecordTotal FOR
SELECT 1679 FROM DUAL;
--记录集2
OPEN curDesktopPage FOR
SELECT * FROM DESKTOP_PAGE;
--输出参数
RecordTotal := 1688;
end;
end;
--包
create or replace
PACKAGE "DESKTOP_PAGE_PACKAGE" as
TYPE T_CURSOR IS REF CURSOR;
procedure GetDesktopPage (RecordTotal OUT NUMBER, curRecordTotal OUT T_CURSOR, curDesktopPage OUT T_CURSOR);
end;
--包体
create or replace
PACKAGE BODY "DESKTOP_PAGE_PACKAGE" as
procedure GetDesktopPage (RecordTotal OUT NUMBER, curRecordTotal OUT T_CURSOR, curDesktopPage OUT T_CURSOR) is
begin
--记录集1
OPEN curRecordTotal FOR
SELECT 1679 FROM DUAL;
--记录集2
OPEN curDesktopPage FOR
SELECT * FROM DESKTOP_PAGE;
--输出参数
RecordTotal := 1688;
end;
end;
C#程序操作存储过程：
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OleDbCommand store = new OleDbCommand ();
store.Parameters.Clear ();
store.Connection = con;
store.CommandType = CommandType.StoredProcedure;
store.CommandText = "DESKTOP_PAGE_PACKAGE.GetDesktopPage";
store.Parameters.Add ("RecordTotal", OleDbType.Numeric).Value = null;
store.Parameters["RecordTotal"].Size = -1;
store.Parameters["RecordTotal"].Scale = 0;
store.Parameters["RecordTotal"].Precision = 0;
store.Parameters["RecordTotal"].Direction = ParameterDirection.Output;
try
{
OleDbDataAdapter da = new OleDbDataAdapter (store);
DataSet ds = new DataSet ();
da.Fill (ds);
Response.Write ("输出参数返回记录数：" + store.Parameters["RecordTotal"].Value + "
");
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
Response.Write ("记录集1返回记录数：" + ds.Tables[0].Rows[i][0] + "
");
}
Response.Write ("
记录集2返回数据：
");
for (int i = 0; i < ds.Tables[1].Rows.Count; i++)
{
Response.Write (ds.Tables[1].Rows[i][0] + ", " + ds.Tables[1].Rows[i][1] + ", " + ds.Tables[1].Rows[i][2] + "
");
}
}
finally
{
con.Close ();
}
OleDbCommand store = new OleDbCommand ();
store.Parameters.Clear ();
store.Connection = con;
store.CommandType = CommandType.StoredProcedure;
store.CommandText = "DESKTOP_PAGE_PACKAGE.GetDesktopPage";
store.Parameters.Add ("RecordTotal", OleDbType.Numeric).Value = null;
store.Parameters["RecordTotal"].Size = -1;
store.Parameters["RecordTotal"].Scale = 0;
store.Parameters["RecordTotal"].Precision = 0;
store.Parameters["RecordTotal"].Direction = ParameterDirection.Output;
try
{
OleDbDataAdapter da = new OleDbDataAdapter (store);
DataSet ds = new DataSet ();
da.Fill (ds);
Response.Write ("输出参数返回记录数：" + store.Parameters["RecordTotal"].Value + "
");
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
Response.Write ("记录集1返回记录数：" + ds.Tables[0].Rows[i][0] + "
");
}
Response.Write ("
记录集2返回数据：
");
for (int i = 0; i < ds.Tables[1].Rows.Count; i++)
{
Response.Write (ds.Tables[1].Rows[i][0] + ", " + ds.Tables[1].Rows[i][1] + ", " + ds.Tables[1].Rows[i][2] + "
");
}
}
finally
{
con.Close ();
}
因为主要是介绍操作数据库存储过程的方法，如何连接数据库请自己写；
一、对CLOB字段的增、改、查；
假设表名为：DESKTOP_PAGE，包含2个字段：USERCODE(普通字符串)、CONTENT(CLOB类型)
Oracle存储过程脚本为：
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--包
create or replace
PACKAGE DESKTOP_TEXTLIST_PACKAGE AS
TYPE T_CURSOR IS REF CURSOR;
--CrudAction：0：增；1：读；2：改；3：删；
--IOFields：查、改的字段列表字符串，使用分号分隔
--OrderBys：排序字段
--PageNo：页码
--PageSize：每页记录数
--RecordTotal：总记录数
--RecordSet：返回记录集
procedure DesktopTextListStorer (CrudAction IN INTEGER, fldUserCode IN NVARCHAR2, fldContent IN NCLOB, IOFields IN NVARCHAR2, OrderBys IN NVARCHAR2, PageNo IN INTEGER, PageSize IN INTEGER, RecordTotal OUT NUMBER, RecordSet IN OUT T_CURSOR);
END DESKTOP_TEXTLIST_PACKAGE;
--包体：
create or replace
PACKAGE BODY DESKTOP_TEXTLIST_PACKAGE AS
strFields VARCHAR2 (4000);
strOrderBys VARCHAR2 (4000);
strJoin VARCHAR2 (10);
strCond VARCHAR2 (4000);
strLike VARCHAR2 (500);
strWhere VARCHAR2 (10);
strAnd VARCHAR2 (10);
strSQLCalc VARCHAR2 (4000);
strSQLView VARCHAR2 (4000);
strEscape VARCHAR2 (500);
--CrudAction：0：增；1：读；2：改；3：删；
procedure DesktopTextListStorer (CrudAction IN INTEGER, fldUserCode IN NVARCHAR2, fldContent IN NCLOB, IOFields IN NVARCHAR2, OrderBys IN NVARCHAR2, PageNo IN INTEGER, PageSize IN INTEGER, RecordTotal OUT NUMBER, RecordSet IN OUT T_CURSOR) AS
BEGIN
RecordTotal := 0;
IF CrudAction < 0 OR CrudAction > 3 OR CrudAction IS NULL THEN
RETURN;
END IF;
IF CrudAction = 0 THEN
INSERT INTO DESKTOP_TEXTLIST ("USERCODE", "CONTENT")
VALUES (fldUserCode, fldContent);
RETURN;
END IF;
IF CrudAction = 2 then
IF IOFields IS NULL THEN
UPDATE DESKTOP_TEXTLIST
SET "CONTENT" = FLDCONTENT,
"FUNCODE" = FLDFUNCODE
WHERE "USERCODE" = fldUserCode;
ELSE
strCond := ',' + IOFields + ',';
strCond := REPLACE (strCond, ',USERCODE,', ',USERCODE=' || fldUserCode || ',');
strSQLView := 'UPDATE DESKTOP_PAGE'
|| ' SET ' || strCond
|| ' WHERE USERCODE=''' || fldUserCode || ''';
EXECUTE IMMEDIATE strSQLView;
IF INSTR (IOFIELDS, ',CONTENT,') > 0 THEN
UPDATE DESKTOP_TEXTLIST
SET "CONTENT" = fldContent
WHERE "USERCODE" = FLDUSERCODE;
END IF;
END IF;
RETURN;
END IF;
strCond := NULL;
strJoin := NULL;
strEscape := 'ESCAPE CHR (92 USING NCHAR_CS)';
IF fldUserCode IS NOT NULL THEN
strCond := strCond || strJoin || ' USERCODE = ''' || REPLACE (fldUserCode, '''', '''''') || '''';
strJoin := ' AND';
END IF;
IF FLDCONTENT IS NOT NULL THEN
strLike := REPLACE (fldContent, '''', '''''');
strCond := strCond || strJoin || ' DBMS_LOB.INSTR (CONTENT, ''' || strLike || ''') > 0';
strJoin := ' AND';
END IF;
IF strCond IS NULL THEN
strWhere := '';
strAnd := '';
ELSE
strWhere := ' WHERE';
strAnd := ' AND';
END IF;
IF CrudAction = 1 THEN
IF IOFields IS NULL THEN
strFields := 'DESKTOP_TEXTLIST.*';
ELSE
strFields := IOFields;
END IF;
IF OrderBys IS NULL THEN
strOrderBys := 'USERCODE, PAGECODE, FUNCODE';
ELSE
strOrderBys := REPLACE (OrderBys, ':0', '');
strOrderBys := REPLACE (strOrderBys, ':1', ' DESC');
END IF;
strSQLCalc := 'SELECT COUNT(*)'
|| ' FROM DESKTOP_TEXTLIST'
|| STRWHERE || STRCOND;
EXECUTE IMMEDIATE strSQLCalc INTO RecordTotal;
IF PageNo IS NULL THEN
strSQLView := 'SELECT ' || strFields
|| ' FROM DESKTOP_TEXTLIST'
|| strWhere || strCond
|| ' ORDER BY ' || strOrderBys;
ELSE
strSQLView := 'SELECT * FROM ('
|| ' SELECT ' || strFields || ', rownum rn FROM DESKTOP_TEXTLIST'
|| ' WHERE rownum <= ' || (PageSize * PageNo)
|| ' ORDER BY ' || strOrderBys || ')'
|| ' WHERE rn >= ' || (PageSize * (PageNo -1))
|| strAnd || strCond
|| ' ORDER BY ' || strOrderBys;
END IF;
OPEN RecordSet FOR strSQLView;
return;
ELSE
strSQLView := 'DELETE DESKTOP_TEXTLIST'
|| strWhere || strCond;
EXECUTE IMMEDIATE strSQLView;
END IF;
END DesktopTextListStorer;
END DESKTOP_TEXTLIST_PACKAGE;
--包
create or replace
PACKAGE DESKTOP_TEXTLIST_PACKAGE AS
TYPE T_CURSOR IS REF CURSOR;
--CrudAction：0：增；1：读；2：改；3：删；
--IOFields：查、改的字段列表字符串，使用分号分隔
--OrderBys：排序字段
--PageNo：页码
--PageSize：每页记录数
--RecordTotal：总记录数
--RecordSet：返回记录集
procedure DesktopTextListStorer (CrudAction IN INTEGER, fldUserCode IN NVARCHAR2, fldContent IN NCLOB, IOFields IN NVARCHAR2, OrderBys IN NVARCHAR2, PageNo IN INTEGER, PageSize IN INTEGER, RecordTotal OUT NUMBER, RecordSet IN OUT T_CURSOR);
END DESKTOP_TEXTLIST_PACKAGE;
--包体：
create or replace
PACKAGE BODY DESKTOP_TEXTLIST_PACKAGE AS
strFields VARCHAR2 (4000);
strOrderBys VARCHAR2 (4000);
strJoin VARCHAR2 (10);
strCond VARCHAR2 (4000);
strLike VARCHAR2 (500);
strWhere VARCHAR2 (10);
strAnd VARCHAR2 (10);
strSQLCalc VARCHAR2 (4000);
strSQLView VARCHAR2 (4000);
strEscape VARCHAR2 (500);
--CrudAction：0：增；1：读；2：改；3：删；
procedure DesktopTextListStorer (CrudAction IN INTEGER, fldUserCode IN NVARCHAR2, fldContent IN NCLOB, IOFields IN NVARCHAR2, OrderBys IN NVARCHAR2, PageNo IN INTEGER, PageSize IN INTEGER, RecordTotal OUT NUMBER, RecordSet IN OUT T_CURSOR) AS
BEGIN
RecordTotal := 0;
IF CrudAction < 0 OR CrudAction > 3 OR CrudAction IS NULL THEN
RETURN;
END IF;
IF CrudAction = 0 THEN
INSERT INTO DESKTOP_TEXTLIST ("USERCODE", "CONTENT")
VALUES (fldUserCode, fldContent);
RETURN;
END IF;
IF CrudAction = 2 then
IF IOFields IS NULL THEN
UPDATE DESKTOP_TEXTLIST
SET "CONTENT" = FLDCONTENT,
"FUNCODE" = FLDFUNCODE
WHERE "USERCODE" = fldUserCode;
ELSE
strCond := ',' + IOFields + ',';
strCond := REPLACE (strCond, ',USERCODE,', ',USERCODE=' || fldUserCode || ',');
strSQLView := 'UPDATE DESKTOP_PAGE'
|| ' SET ' || strCond
|| ' WHERE USERCODE=''' || fldUserCode || ''';
EXECUTE IMMEDIATE strSQLView;
IF INSTR (IOFIELDS, ',CONTENT,') > 0 THEN
UPDATE DESKTOP_TEXTLIST
SET "CONTENT" = fldContent
WHERE "USERCODE" = FLDUSERCODE;
END IF;
END IF;
RETURN;
END IF;
strCond := NULL;
strJoin := NULL;
strEscape := 'ESCAPE CHR (92 USING NCHAR_CS)';
IF fldUserCode IS NOT NULL THEN
strCond := strCond || strJoin || ' USERCODE = ''' || REPLACE (fldUserCode, '''', '''''') || '''';
strJoin := ' AND';
END IF;
IF FLDCONTENT IS NOT NULL THEN
strLike := REPLACE (fldContent, '''', '''''');
strCond := strCond || strJoin || ' DBMS_LOB.INSTR (CONTENT, ''' || strLike || ''') > 0';
strJoin := ' AND';
END IF;
IF strCond IS NULL THEN
strWhere := '';
strAnd := '';
ELSE
strWhere := ' WHERE';
strAnd := ' AND';
END IF;
IF CrudAction = 1 THEN
IF IOFields IS NULL THEN
strFields := 'DESKTOP_TEXTLIST.*';
ELSE
strFields := IOFields;
END IF;
IF OrderBys IS NULL THEN
strOrderBys := 'USERCODE, PAGECODE, FUNCODE';
ELSE
strOrderBys := REPLACE (OrderBys, ':0', '');
strOrderBys := REPLACE (strOrderBys, ':1', ' DESC');
END IF;
strSQLCalc := 'SELECT COUNT(*)'
|| ' FROM DESKTOP_TEXTLIST'
|| STRWHERE || STRCOND;
EXECUTE IMMEDIATE strSQLCalc INTO RecordTotal;
IF PageNo IS NULL THEN
strSQLView := 'SELECT ' || strFields
|| ' FROM DESKTOP_TEXTLIST'
|| strWhere || strCond
|| ' ORDER BY ' || strOrderBys;
ELSE
strSQLView := 'SELECT * FROM ('
|| ' SELECT ' || strFields || ', rownum rn FROM DESKTOP_TEXTLIST'
|| ' WHERE rownum <= ' || (PageSize * PageNo)
|| ' ORDER BY ' || strOrderBys || ')'
|| ' WHERE rn >= ' || (PageSize * (PageNo -1))
|| strAnd || strCond
|| ' ORDER BY ' || strOrderBys;
END IF;
OPEN RecordSet FOR strSQLView;
return;
ELSE
strSQLView := 'DELETE DESKTOP_TEXTLIST'
|| strWhere || strCond;
EXECUTE IMMEDIATE strSQLView;
END IF;
END DesktopTextListStorer;
END DESKTOP_TEXTLIST_PACKAGE;
四、对特殊字符的查询，如查询文本中是否包含“%”、“\”、“’”、“_”等符号；
Oracle脚本：
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strEscape := 'ESCAPE CHR (92 USING NCHAR_CS)';
strLike := REPLACE (fldPageName, '%', '\%');
STRLIKE := REPLACE (STRLIKE, '_', '\_');
strLike := REPLACE (strLike, '\', '\\');
strLike := REPLACE (strLike, '''', '''''');
strCond := strCond || strJoin || ' PAGENAME LIKE ''%' || strLike || '%'' ' || strEscape;
strEscape := 'ESCAPE CHR (92 USING NCHAR_CS)';
strLike := REPLACE (fldPageName, '%', '\%');
STRLIKE := REPLACE (STRLIKE, '_', '\_');
strLike := REPLACE (strLike, '\', '\\');
strLike := REPLACE (strLike, '''', '''''');
strCond := strCond || strJoin || ' PAGENAME LIKE ''%' || strLike || '%'' ' || strEscape;
以上是笔者操作Oracle数据库总结出来的一些经验，然后对大家有所帮助。s
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/cuizm/archive/2011/06/07/6528869.aspx