# 插入ClickHouse数据
#### 功能介绍
如下示例代码通过循环batchNum次，构造示例数据并通过PreparedStatement的executeBatch()方法批量插入数据。
其中数据类型为创建的表所指定的三个字段，分别是String、UInt8和Date类型。
#### 样例代码
```
String insertSql = "insert into " + databaseName + "." + tableName + " values (?,?,?)"; 
PreparedStatement preparedStatement = connection.prepareStatement(insertSql); 
long allBatchBegin = System.currentTimeMillis(); 
for (int j = 0; j < batchNum; j++) {
     for (int i = 0; i < batchRows; i++) {
         preparedStatement.setString(1, "xxx_" + (i + j * 10));
         preparedStatement.setInt(2, ((int) (Math.random() * 100)));
         preparedStatement.setDate(3, generateRandomDate("2018-01-01", "2021-12-31"));
         preparedStatement.addBatch();
     }
     long begin = System.currentTimeMillis();
     preparedStatement.executeBatch();
     long end = System.currentTimeMillis();
     log.info("Inert batch time is {} ms", end - begin); 
} 
long allBatchEnd = System.currentTimeMillis(); 
log.info("Inert all batch time is {} ms", allBatchEnd - allBatchBegin);
```