如何用jsp處理Oracle中CLOB類型的字段

1.CLOB字段的插入
clob類型的數據直接insert可能會因爲字符過長而出錯,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);

然後插入空值

String strSql = “INSERT INTO TEST(id,content) values(‘0001’,?) ”;
con.setAutoCommit(false); //conn爲Connection對象
//創建並實例化一個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爲Connection對象
//創建並實例化一個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>");

}