init output stream是一个Java API中的方法,其作用是初始化输出流。下面我们来详细分析一下该方法的源码和使用方法。
方法签名
public static JdbcOutputConnection initOutputConnection(
String driverClass,
String url,
String user,
String passwd,
String table,
String[] columns,
InsertMode insertMode,
int batchSize,
Map<String,String> extraParams,
String pluginName,
boolean enableParallel,
boolean enableRetry,
int maxRetryTimes,
boolean enableGroups,
LocationPolicy locationPolicy,
long retryInterval,
boolean enableDynamicGroup,
String fieldDelim,
String lineDelim,
List<String> partitionKeys,
Map<String,String> partitionValues,
String serializerName,
boolean schemaInfer,
String schemaLiteral
)
参数说明
driverClass
: 驱动类名,用于连接数据源url
: 数据库连接URLuser
: 用户名passwd
: 密码table
: 目标表名columns
: 列名列表insertMode
: 插入模式(Append、Overwrite、Ignore、ErrorIfExists)batchSize
: 批量提交大小extraParams
: 额外的参数pluginName
: 插件名enableParallel
: 是否开启并行enableRetry
: 是否开启重试maxRetryTimes
: 最大重试次数enableGroups
: 是否开启分组locationPolicy
: 地点策略retryInterval
: 重试间隔时间enableDynamicGroup
: 是否启用动态分组fieldDelim
: 字段分隔符lineDelim
: 行分隔符partitionKeys
: 分区键列表partitionValues
: 分区值列表serializerName
: 序列化器名称schemaInfer
: 是否启用Schema推测schemaLiteral
: Schema信息
返回值说明
JdbcOutputConnection
: 返回值为JdbcOutputConnection对象。其中包含操作数据库所需的连接信息。
使用示例1
String driverClass = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/demo";
String user = "root";
String passwd = "root";
String table = "t_user";
String[] columns = new String[]{"id", "name", "age", "gender"};
InsertMode insertMode = InsertMode.Append;
int batchSize = 100;
Map<String, String> extraParams = new HashMap<String, String>();
String pluginName = "mysql";
boolean enableParallel = true;
boolean enableRetry = false;
int maxRetryTimes = 3;
boolean enableGroups = false;
LocationPolicy locationPolicy = null;
long retryInterval = 3000;
boolean enableDynamicGroup = false;
String fieldDelim = "\t";
String lineDelim = "\n";
List<String> partitionKeys = new ArrayList<String>();
Map<String, String> partitionValues = new HashMap<String, String>();
String serializerName = "mySerializer";
boolean schemaInfer = false;
String schemaLiteral = null;
JdbcOutputConnection conn = initOutputConnection(
driverClass,
url,
user,
passwd,
table,
columns,
insertMode,
batchSize,
extraParams,
pluginName,
enableParallel,
enableRetry,
maxRetryTimes,
enableGroups,
locationPolicy,
retryInterval,
enableDynamicGroup,
fieldDelim,
lineDelim,
partitionKeys,
partitionValues,
serializerName,
schemaInfer,
schemaLiteral
);
使用示例2
String driverClass = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/demo";
String user = "root";
String passwd = "root";
String table = "t_user";
String[] columns = new String[]{"id", "name", "age", "gender"};
InsertMode insertMode = InsertMode.Append;
int batchSize = 100;
Map<String, String> extraParams = new HashMap<String, String>();
String pluginName = "mysql";
boolean enableParallel = true;
boolean enableRetry = false;
int maxRetryTimes = 3;
boolean enableGroups = false;
LocationPolicy locationPolicy = null;
long retryInterval = 3000;
boolean enableDynamicGroup = false;
String fieldDelim = "\t";
String lineDelim = "\n";
List<String> partitionKeys = new ArrayList<String>();
Map<String, String> partitionValues = new HashMap<String, String>();
String serializerName = "mySerializer";
boolean schemaInfer = false;
String schemaLiteral = null;
try {
JdbcOutputConnection conn = initOutputConnection(
driverClass,
url,
user,
passwd,
table,
columns,
insertMode,
batchSize,
extraParams,
pluginName,
enableParallel,
enableRetry,
maxRetryTimes,
enableGroups,
locationPolicy,
retryInterval,
enableDynamicGroup,
fieldDelim,
lineDelim,
partitionKeys,
partitionValues,
serializerName,
schemaInfer,
schemaLiteral
);
System.out.println("连接已建立");
} catch (SQLException e) {
System.err.println("连接建立失败:" + e.getMessage());
}
以上是关于init output stream初始化输出流源码分析及使用示例的详细内容。需要注意的是,使用该方法需要传入正确的参数,并注意异常处理,以免出现错误。
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