java insert data into Mysql database

Question

I translate the function to the flowing application The application use PreparedStatement pstmt to insert String array of two dimention,when i make it start ,problems appeared like the photo

import java.sql.PreparedStatement;

public static void main(String[] args){

java.sql.Connection conn = java.sql.DriverManager.getConnection(
        url, user, password);

the String array to write into databace.

String[][] sheetContent={{"100007"," 钢笔", "200", "xxx"},{"100020", "鞋子","700", "AAA"}};
int rows=2;
int columns = 4;
String sql = "INSERT INTO product(编号,商品名,单价,提供商) VALUES(?,?,?,?)";
PreparedStatement pstmt = conn.prepareStatement(sql); 
        for(int r=0;r<rows;r++){
            for(int c=0;c<columns;c++){
                pstmt.setString(c, sheetContent[r][c]);
            }
        }
pstmt.executeUpdate();

Answer 1

You need to be clever with how you use your column indices:

PreparedStatement pstmt = conn.prepareStatement(sql); 
for (int r=0; r < rows; r++) {
    for (int c=0; c < columns; c++) {
        int index = 1 + (r * columns) + c;
        pstmt.setString(index, sheetContent[r][c]);
    }
}
pstmt.executeUpdate();

Answer 2

you should start Index of preparedStatement from 1 , what you are doing is starting from 0.

index = must starts with index integer 1.

pstmt.setString(index, sheetContent[r][c]);

example: pstmt.setString(1, sheetContent[r][c]); pstmt.setString(2, sheetContent[r][c]);