Jdbc Batch Insert Generated Keys Mysql
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Using auto generated keys.; 2 minutes to read +2; In this article. Download JDBC Driver. The Microsoft JDBC Driver for SQL Server supports the optional JDBC 3.0 APIs to retrieve automatically generated row identifiers. It shows that you have successfully inserted a new candidate into the candidates table with id 134. In this tutorial, we have shown you how to use PreparedStatement object to insert a new record into a MySQL table and get the inserted ID back for further processing. Specifically, this method uses some Spring JDBC classes and methods to (a) execute a SQL INSERT statement, (b) get the generated id from the database for the record I just inserted (i.e., the value of the autoincrement field in a MySQL database table), and (c) return that integer value at.
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Date: February 24, 2016 08:41AM
It shows that you have successfully inserted a new candidate into the candidates table with id 134. In this tutorial, we have shown you how to use PreparedStatement object to insert a new record into a MySQL table and get the inserted ID back for further processing. So you will need to check if your driver actually supports it for batch updates. As indicated in the answer by Philip O., retrieval of generated keys is not supported with batch updates as documented in Oracle 12 JDBC Standards Support: You cannot combine auto-generated keys with batch update.
But in case of batch insert autogenerated ids are not obtained.
I have just check the source code of com.mysql.jdbc.Statement. It contains the field
batchedGeneratedKeys.
After debuging the code using statment.executeBatch(), I found that batchedGeneratedKeys is populated with actual generated ids inside getBatchedGeneratedKeys() method, which is called by executeBatch itself.
Question : Why this class not exposed the field
batchedGeneratedKeys using getGeneratedIds(). This will be useful for calling module. It will reduce one select Query to determine generated ids.
Following is the codesnippet is tried. Used Java reflection to get this ids.
@Test
public void testBatch() throws SQLException, NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
String sqlInsert = 'INSERT INTO AdSize (name,height,width,type,created_at,updated_at) VALUES ';
StringBuilder sqlBatchBuilder = new StringBuilder(sqlInsert);
int width = 1000;
int height = 1000;
for (int i = 0; i < 10; i++) {
if(!sqlBatchBuilder.toString().equals(sqlInsert)) {
sqlBatchBuilder.append(',');
}
String name = width + ' x ' + height + ' (Custom)';
sqlBatchBuilder
.append('(')
.append(name)
.append(',')
.append(height)
.append(',')
.append(width)
.append(',')
.append('custom')
.append(',')
.append('now()')
.append(',')
.append('now())');
width++;
height++;
}
// sqlBatchBuilder.append(')');
System.out.println(sqlBatchBuilder.toString());
Statement stmt = null;
Connection connection = getDataSource().getConnection();
stmt = connection.createStatement();
stmt.addBatch(sqlBatchBuilder.toString());
stmt.executeBatch();
Field batchedGeneratedKeys = com.mysql.jdbc.Statement.class.getDeclaredField('batchedGeneratedKeys');
batchedGeneratedKeys.setAccessible(true);
// get underline statement object _stmt
Field _stmt = stmt.getClass().getDeclaredField('_stmt');
_stmt.setAccessible(true);
com.mysql.jdbc.Statement statement = (com.mysql.jdbc.Statement) _stmt.get(stmt);
ArrayList batchedGeneratedKeysList = (ArrayList) batchedGeneratedKeys.get(statement);
for (Object generatedKey : batchedGeneratedKeysList) {
byte[][] keyArray = (byte[][]) generatedKey;
for (byte[] bs : keyArray) {
System.out.println(new String(bs));
}
// System.out.println();
}
stmt.close();
connection.close();
}
Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.
Date: February 24, 2016 08:41AM
But in case of batch insert autogenerated ids are not obtained.
I have just check the source code of com.mysql.jdbc.Statement. It contains the field
batchedGeneratedKeys.
After debuging the code using statment.executeBatch(), I found that batchedGeneratedKeys is populated with actual generated ids inside getBatchedGeneratedKeys() method, which is called by executeBatch itself.
Question : Why this class not exposed the field
batchedGeneratedKeys using getGeneratedIds(). This will be useful for calling module. It will reduce one select Query to determine generated ids.
Following is the codesnippet is tried. Used Java reflection to get this ids.
@Test
public void testBatch() throws SQLException, NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
String sqlInsert = 'INSERT INTO AdSize (name,height,width,type,created_at,updated_at) VALUES ';
StringBuilder sqlBatchBuilder = new StringBuilder(sqlInsert);
int width = 1000;
int height = 1000;
for (int i = 0; i < 10; i++) {
if(!sqlBatchBuilder.toString().equals(sqlInsert)) {
sqlBatchBuilder.append(',');
}
String name = width + ' x ' + height + ' (Custom)';
sqlBatchBuilder
.append('(')
.append(name)
.append(',')
.append(height)
.append(',')
.append(width)
.append(',')
.append('custom')
.append(',')
.append('now()')
.append(',')
.append('now())');
width++;
height++;
}
// sqlBatchBuilder.append(')');
System.out.println(sqlBatchBuilder.toString());
Statement stmt = null;
Connection connection = getDataSource().getConnection();
stmt = connection.createStatement();
stmt.addBatch(sqlBatchBuilder.toString());
stmt.executeBatch();
Field batchedGeneratedKeys = com.mysql.jdbc.Statement.class.getDeclaredField('batchedGeneratedKeys');
batchedGeneratedKeys.setAccessible(true);
// get underline statement object _stmt
Field _stmt = stmt.getClass().getDeclaredField('_stmt');
_stmt.setAccessible(true);
com.mysql.jdbc.Statement statement = (com.mysql.jdbc.Statement) _stmt.get(stmt);
ArrayList batchedGeneratedKeysList = (ArrayList) batchedGeneratedKeys.get(statement);
for (Object generatedKey : batchedGeneratedKeysList) {
byte[][] keyArray = (byte[][]) generatedKey;
for (byte[] bs : keyArray) {
System.out.println(new String(bs));
}
// System.out.println();
}
stmt.close();
connection.close();
}
Jdbc Batch Insert Generated Keys Mysql Download
Jdbc Batch Insert Generated Keys Mysql 10
Jdbc Batch Select
Jdbc Batch Insert Generated Keys Mysql File
Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.
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