1.       clob字段的插入

clob類型的數據直接insert可能會因為字符過長而出錯,所以要用對象形式插入.

示例:

首先,創建一個含clob字段的表:

create table test (id integer, content clob);

然后插入空值

string strsql = “insert into test(id,content) values(‘0001’,?) ”;

con.setautocommit(false);  //conn為connection對象

//創建并實例化一個clob對象

clob clob = new clob((oracleconnection)con);

   clob = oracle.sql.clob.createtemporary((oracleconnection)con,true,1);

//對clob對象賦值

   clob.putstring(1,formatesinglequotes(content));

   oracleconnection ocon = (oracleconnection)con;

   oraclepreparedstatement pstmt = (oraclepreparedstatement)ocon.preparecall(strsql);

   pstmt.setclob(1,clob);

   int i  = pstmt.executeupdate();

   pstmt.close();

   ocon.commit();

   ocon = null;

con = null;      

boolean flag = true;

if(i <=0)

 {

      flag = false;

 }

if (flag == true)

 {

       out.print( "<script>alert('成功保存!'); </script>");

}

 else

 {

       out.print( "<script>alert('保存數據時出錯,請檢查你輸入的數據格式是否符合要求');self.history.back ();</script>");

 }

注意：

一定不要忘記引入包：import oracle.sql.*,oracle.jdbc.driver.*

2.       clob類型的修改

對clob字段的修改除了sql語句外其他和插入相同

string strsql = “update test set content=? where id=’0001’ ”;

con.setautocommit(false);  //conn為connection對象

//創建并實例化一個clob對象

clob clob = new clob((oracleconnection)con);

   clob = oracle.sql.clob.createtemporary((oracleconnection)con,true,1);

//對clob對象賦值

   clob.putstring(1,formatesinglequotes(content));

   oracleconnection ocon = (oracleconnection)con;

   oraclepreparedstatement pstmt = (oraclepreparedstatement)ocon.preparecall(strsql);

   pstmt.setclob(1,clob);

   int i  = pstmt.executeupdate();

   pstmt.close();

   ocon.commit();

   ocon = null;

con = null;      

boolean flag = true;

if(i <=0)

 {

      flag = false;

 }

if (flag == true)

 {

       out.print( "<script>alert('成功保存!'); </script>");

}

 else

 {

       out.print( "<script>alert('保存數據時出錯,請檢查你輸入的數據格式是否符合要求');self.history.back ();</script>");

 }