JDBC的批处理操作三种方式
SQL批处理是JDBC性能优化的重要武器，批处理的用法有三种。
package lavasoft.jdbctest;
import lavasoft.common.DBToolkit;
import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.SQLException; import java.sql.Statement;
public class BatchExeSQLTest {
public static void main(String[] args) {
exeBatchStaticSQL();
}
/** * 批量执行预定义模式的SQL */
public static void exeBatchParparedSQL() {
Connection conn = null;
try {
conn = DBToolkit.getConnection();
String sql = "insert into testdb.book (kind, name) values (?,?)";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setString(1, "java");
pstmt.setString(2, "jjjj");
pstmt.addBatch(); //添加一次预定义参数
pstmt.setString(1, "ccc");
pstmt.setString(2, "dddd");
pstmt.addBatch(); //再添加一次预定义参数
//批量执行预定义SQL
pstmt.executeBatch();
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBToolkit.closeConnection(conn);
}
}
/** * 批量执行混合模式的SQL、有预定义的，还有静态的 */
public static void exeBatchMixedSQL() {
Connection conn = null;
try {
conn = DBToolkit.getConnection();
String sql = "insert into testdb.book (kind, name) values (?,?)";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setString(1, "java");
pstmt.setString(2, "jjjj");
pstmt.addBatch(); //添加一次预定义参数
pstmt.setString(1, "ccc");
pstmt.setString(2, "dddd");
pstmt.addBatch(); //再添加一次预定义参数
//添加一次静态SQL
pstmt.addBatch("update testdb.book set kind = ‘JAVA‘ where kind=‘java‘");
//批量执行预定义SQL
pstmt.executeBatch();
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBToolkit.closeConnection(conn);
}
}
/** * 执行批量静态的SQL */
public static void exeBatchStaticSQL() {
Connection conn = null;
try {
conn = DBToolkit.getConnection();
Statement stmt = conn.createStatement(); //连续添加多条静态SQL
stmt.addBatch("insert into testdb.book (kind, name) values (‘java‘, ‘java in aciton‘)");
stmt.addBatch("insert into testdb.book (kind, name) values (‘c‘, ‘c in aciton‘)");
stmt.addBatch("delete from testdb.book where kind =‘C#‘");
stmt.addBatch("update testdb.book set kind = ‘JAVA‘ where kind=‘java‘");
// stmt.addBatch("select count(*) from testdb.book"); //批量执行不支持Select语句
//执行批量执行
stmt.executeBatch();
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBToolkit.closeConnection(conn);
}
}
}
注意：JDBC的批处理不能加入select语句，否则会抛异常：
java.sql.BatchUpdateException: Can not issue SELECT via executeUpdate(). at com.mysql.jdbc.StatementImpl.executeBatch(StatementImpl.java:1007)
本文出自 “熔 岩” 博客，请务必保留此出处http://lavasoft.blog.51cto.com/62575/238651
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