I have a situation where I need to make Clob object from String. The problem is I can't have ConnectionManager in that method.
I need to some utility like
public Clob getClob(String data){
}
Can any one tell me how can I make this.
I have oralce.sql.CLOB also. however it requires Connection to create object.
那些仍在寻找替代答案的人,可以在不需要连接对象的情况下创建 Clob 对象,如下所示。
Clob myClob = new javax.sql.rowset.serial.SerialClob(stringData.toCharArray());
Throws warning: Clob not initialized.
You need an OracleConnection to create a Clob, using the Oracle Database.
OracleConnection conn; // initialize this first
Clob myClob = conn.createClob();
private OracleConnection conn = null;
public void setConnection( OracleConnection conn )
{
this.conn = conn;
}
void setClob( String cookie ) throws SQLException
{
Clob myClob = conn.createClob();
myClob.setString( 1, cookie);
}
Try this :
OracleConnection conn; // initialize this first
CLOB clob = conn.createClob();
public Clob getClob(String data){
return clob.setString(position, data);
}
In order to initialize the OracleConnection mentioned in the other answers here and if you're doing this for a java stored procedure and the connection is to the database where the procedure is stored, then the Connection can be initialized like this:
Connection conn = DriverManager.getConnection("jdbc:default:connection:");
and this import is needed:
import oracle.jdbc.driver.OracleConnection;
If you're using spring boot and you only have a JdbcTemplate obj you can get an Oracle connection using:
private JdbcTemplate jdbcTemplate; // or NamedParameterJdbcTemplate
Clob myClob = this.jdbcTemplate.getJdbcTemplate().getDataSource().getConnection().createClob();
If you are looking for an opportunity to create a [N]Clob
without a Connection you can use NonContextualLobCreator
from the Hibernate project. Following example shows the create of an NCLob
using a string
String xml = "my blob content";
NClob clob = NonContextualLobCreator.INSTANCE.createNClob(xml);
entity.setXmlclob);
Available from at least Hibernate 4.2 (maybe earlier).
On my side, I use
Clob generateProxy(String string)
From
import org.hibernate.engine.jdbc.ClobProxy;
I had a similar problem like you where I needed to store a JSON in a field. You dont have to use BLOB or CLOB as a java object, but you can store it as one.
to wrap my answer up, if you are using the ORACLE database(which is a database that always causes problems of speaking its language) use bellow format as a guide or best practice, which is based on oracle documentation itself, to solve your problem:
@Lob @Basic(fetch=LAZY)
@Column(name="REPORT")
protected String report;
As you see, the variable you use to wrangle data is in String(no convertion needed) but it will be stored as a LOB.
Good luck!
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