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Write an JDBC example for inserting value for Clob data type into a table?
Assume we already have a table named MyData in the database with the following description.
+---------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +---------+--------------+------+-----+---------+-------+ | Name | varchar(255) | YES | | NULL | | | Article | longtext | YES | | NULL | | +---------+--------------+------+-----+---------+-------+
If you need to insert value int to the clob data type using a JDBC program you need to use the methods which reads the contents of a file and sets to the database rows. PreparedStatement interface provides such methods.
The void setCharacterStream(int parameterIndex, Reader reader) method sets the contents of the reader object as a value to the parameter at the given index. Other variant of this method are:
void setCharacterStream(int parameterIndex, Reader reader, int length)
void setCharacterStream(int parameterIndex, Reader reader, long length)
The void setClob(int parameterIndex, Clob x) method sets the given java.sql.Clob object as a value to the parameter at the given index. Other variant of this method are:
void setClob(int parameterIndex, Reader reader)
void setClob(int parameterIndex, Reader reader, long length)
You can set value to the Clob data type using either of these methods.
Example
Following example sets value to a Clob datatype using the setClob() method.
import java.io.FileReader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
public class InsertingValueInClob {
public static void main(String args[]) throws Exception {
//Registering the Driver
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//Getting the connection
String mysqlUrl = "jdbc:mysql://localhost/sampleDB";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//Inserting values
String query = "INSERT INTO MyData(Name, Article ) VALUES (?, ?)";
PreparedStatement pstmt = con.prepareStatement(query);
pstmt.setString(1, "JavaFX");
FileReader reader = new FileReader("E:\images\javafx.txt");
pstmt.setClob(2, reader);
pstmt.execute();
System.out.println("Data inserted");
}
}Output
Connection established...... Table Created...... Contents of the table are: JavaFX E:\images\MyData_clob_output1.txt
If you try to view the clob value in the record using the MySQL work bench you can see the inserted text data as shown below:
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