[英]JDBC Delete & Insert using batch
我想知道是否可以使用批處理同時執行參數化的DELETE和INSERT語句。 我知道如何插入多行,但是,我首先要執行DELETE語句(需要不同的參數)。 這是我插入多個語句的方式:
String query = "INSERT INTO " + TABLE + "(FOO, BAR) VALUES (?,?);";
PreparedStatement sql = connection.prepareStatement(query);
for(...){
sql.setString(1, fooValue);
sql.setInt(2, barValue);
sql.addBatch();
}
sql.executeBatch();
sql.close();
使用addBatch然后executeBatch:
Statement st = con.createStatement();
st.addBatch("DELETE FROM tbl1");
st.addBatch("DELETE FROM tbl2");
st.addBatch("DELETE FROM tbl3");
int[] results = st.executeBatch();
然后結果將包含一個數組,其中包含從每個表中刪除的行數。
這是一個示例,向您展示如何通過JDBC PreparedStatement在批處理過程中插入幾條記錄。
dbConnection.setAutoCommit(false);//commit trasaction manually
String insertTableSQL = "INSERT INTO DBUSER"
+ "(USER_ID, USERNAME, CREATED_BY, CREATED_DATE) VALUES"
+ "(?,?,?,?)";
PreparedStatement = dbConnection.prepareStatement(insertTableSQL);
preparedStatement.setInt(1, 101);
preparedStatement.setString(2, "mkyong101");
preparedStatement.setString(3, "system");
preparedStatement.setTimestamp(4, getCurrentTimeStamp());
preparedStatement.addBatch();
preparedStatement.setInt(1, 102);
preparedStatement.setString(2, "mkyong102");
preparedStatement.setString(3, "system");
preparedStatement.setTimestamp(4, getCurrentTimeStamp());
preparedStatement.addBatch();
preparedStatement.executeBatch();
dbConnection.commit();
示例/完整程序JDBC-批處理PreparedStatement-使用Java中的PreparedStatement的executeUpdate方法執行DELETE查詢
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
/** Copyright (c), AnkitMittal JavaMadeSoEasy.com */
public class PreparedStatementDeleteExample {
public static void main(String... arg) {
Connection con = null;
PreparedStatement prepStmt = null;
try {
// registering Oracle driver class
Class.forName("oracle.jdbc.driver.OracleDriver");
// getting connection
con = DriverManager.getConnection(
"jdbc:oracle:thin:@localhost:1521:orcl",
"ankit", "Oracle123");
System.out.println("Connection established successfully!");
con.setAutoCommit(false); //Now, transactions won't be committed automatically.
prepStmt = con.prepareStatement("DELETE from EMPLOYEE where ID=? ");
//1) add set of parameters in PreparedStatement's object - BATCH of commands
prepStmt.setInt(1, 7); //substitute first occurrence of ? with 7
prepStmt.addBatch();
//2) add set of parameters in PreparedStatement's object - BATCH of commands
prepStmt.setInt(1, 8); //substitute first occurrence of ? with 8
prepStmt.addBatch();
//Execute PreparedStatement batch
prepStmt.executeBatch();
System.out.println("PreparedStatement Batch executed, DELETE done");
con.commit(); //commit all the transactions
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
finally{
try {
if(prepStmt!=null) prepStmt.close(); //close PreparedStatement
if(con!=null) con.close(); // close connection
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
Connection established successfully!
PreparedStatement Batch executed, DELETE done
在本教程中,我們學習了如何在Java JDBC中使用PreparedStatement的addBatch()
和executeBatch()
方法執行DELETE查詢(DML命令)。
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