- Prepared Statement Return Generated Keys 2017
- Prepared Statement Return Generated Keys Pdf
- Java Preparedstatement Return Generated Keys
Subject to JDBC driver support, this operation will attempt to send the precompiled version of the statement to the database. If the driver does not support precompiled statements, the statement will not reach the database server until it is executed. This distinction determines the moment when SQLExceptions get raised. Why use PreparedStatement? Improves performance: The performance of the application will be faster if you use PreparedStatement interface because query is compiled only once. How to get the instance of PreparedStatement? The prepareStatement method of Connection interface is used to return the object of PreparedStatement. Returning generated keys in MySql with JDBC PreparedStatement duplicate This question already has an answer here: I'm programming with plain JDBC a DAO layer because I only have 61.38 MB on Java Memory in my Tomcat (service hosting). Connection.prepareStatement(sql-statement, Statement.RETURNGENERATEDKEYS); The following forms are valid only if the data source supports SELECT FROM INSERT statements. Sql-statement can be a single-row INSERT statement or a multiple-row INSERT statement. With the first form, you specify the names of the columns for which you want. An interface for a precompiled SQL Statement. An SQL Statement is put into a PreparedStatement and is precompiled so that it can be executed efficiently multiple times. Setter methods are supplied in the PreparedStatement interface for the setting of IN parameters for the statement.
The PreparedStatement interface is a subinterface of Statement. It is used to execute parameterized query.
Let's see the example of parameterized query:
As you can see, we are passing parameter (?) for the values. Its value will be set by calling the setter methods of PreparedStatement.
Why use PreparedStatement?
Improves performance: The performance of the application will be faster if you use PreparedStatement interface because query is compiled only once.
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How to get the instance of PreparedStatement?
The prepareStatement() method of Connection interface is used to return the object of PreparedStatement. Syntax:
Prepared Statement Return Generated Keys 2017
Methods of PreparedStatement interface
The important methods of PreparedStatement interface are given below:
| Method | Description |
|---|---|
| public void setInt(int paramIndex, int value) | sets the integer value to the given parameter index. |
| public void setString(int paramIndex, String value) | sets the String value to the given parameter index. |
| public void setFloat(int paramIndex, float value) | sets the float value to the given parameter index. |
| public void setDouble(int paramIndex, double value) | sets the double value to the given parameter index. |
| public int executeUpdate() | executes the query. It is used for create, drop, insert, update, delete etc. |
| public ResultSet executeQuery() | executes the select query. It returns an instance of ResultSet. |
Prepared Statement Return Generated Keys Pdf
Example of PreparedStatement interface that inserts the record
First of all create table as given below:
Now insert records in this table by the code given below:
Example of PreparedStatement interface that updates the record
Example of PreparedStatement interface that deletes the record
Example of PreparedStatement interface that retrieve the records of a table
Example of PreparedStatement to insert records until user press n
Java Preparedstatement Return Generated Keys
JDBC's auto-generated keys feature provides a way to retrieve valuesfrom columns that are part of an index or have a default value assigned. Derby supports the auto-incrementfeature, which allows users to create columns in tables for which the databasesystem automatically assigns increasing integer values. Users can call themethod Statement.getGeneratedKeys to retrieve the value of such a column.This method returns a ResultSet object with a column for theautomatically generated key. TheDerby implementation ofStatement.getGeneratedKeys returns meaningful results only if the laststatement was a single-row insert statement. If it was a multi-row insert,Statement.getGeneratedKeys will return a result set with only a singlerow, even though it should return one row for each inserted row.
Calling ResultSet.getMetaData onthe ResultSet object returned by getGeneratedKeys produces a ResultSetMetaData objectthat is similar to that returned by IDENTITY_VAL_LOCAL.
Users can indicate that auto-generated columns should be made availablefor retrieval by passing one of the following values as a second argumentto the Connection.prepareStatement, Statement.execute, or Statement.executeUpdate methods:
- A constant indicating that auto-generated keys should be made available. The specific constant to use is Statement.RETURN_GENERATED_KEYS.
- An array of the names of the columns in the inserted row that should be made available. If any column name in the array does not designatean auto-increment column, Derby will throw an error with the Derby embeddeddriver. With the client driver, the one element column name is ignored currently and the value returned corresponds to the identity column. To ensure compatibility with future changes an application should ensure the column described is the identity column. If the column name corresponds to another column or a non-existent column then future changes may result in a value for a different column being returned or an exception being thrown.
- An array of the positions of the columns in the inserted row that shouldbe made available. If any column position in the array does not correlate to an auto-increment column, Derby willthrow an error with the Derby embeddeddriver. With the client driver, the one element position array is ignored currently and the value returned corresponds to the identity column. To ensure compatibility with future changes an application should ensure the column described is the identity column. If the position corresponds to another column or a non-existent column then future changes may result in a value for a different column being returned or an exception being thrown.
Example
Assume that we have a table TABLE1 definedas follows:
The following three code fragments will all do the same thing:that is, they will create a ResultSet that contains the value of C12 that is inserted into TABLE1.
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Code fragment 1:
Code fragment 2:
Code fragment 3:
If there is no indication that auto-generated columns shouldbe made available for retrieval, a call to Statement.getGeneratedKeys will return a null ResultSet.