Insert row into database with PreparedStatement

问题

I want to insert a row into a table using PreparedStatement. The table got 3 columns(int, String, String). The thing is that the int column is AUTO_INCREMENT, so I want to leave that variable empty and let the database do that job (It's an id). Haven't found out how to do this though!

It's an MySQL database.

回答1:

That's relatively simple, just leave out the autoincrement column from the column list:

insert into mytbl(str1, str2) values (?, ?)

Prepare the statement, set the two parameters, and execute in non query mode.

回答2:

Just provide the String entries in your sql query string and the database will populate the auto_increment field:

String insertSQL = "INSERT INTO MyTable (StrCol1, StrCol2) VALUES (?, ?)";
PreparedStatement preparedStatement = dbConnection.prepareStatement(insertSQL);
preparedStatement.setString(1, "Val 1");
preparedStatement.setString(2, "Val 2");
preparedStatement.executeUpdate();

回答3:

If the field is already autoincrement, it is enough to populate just the other two fields. Here an example

String sql = "INSERT INTO mytableName("
    + "fistStringColumnName,"
    + "secondStringColumnName) "
    +  "VALUES(?,?)";

try (PreparedStatement pstmt = connection.prepareStatement(sql)) {

    // Set the values
    pstmt.setString(1, "firstString");
    pstmt.setString(2, "secondString");

    // Insert 
    pstmt.executeUpdate();

} catch (SQLException e) {

} catch (FileNotFoundException e) {

}

来源：https://stackoverflow.com/questions/11804906/insert-row-into-database-with-preparedstatement

标签

java

mysql

prepared-statement