1.在com.alibaba.datax.plugin.writer.oraclewriter.OracleWriter中注释此内容,以让oracle支持writeMode模式
2.在com.alibaba.datax.plugin.rdbms.writer.util.WriterUtil中,增加对oracle的判断,将getWriteTemplate修改为如下内容
public static String getWriteTemplate(List<String> columnHolders, List<String> valueHolders, String writeMode, DataBaseType dataBaseType, boolean forceUseUpdate) {
String mode = writeMode.trim().toLowerCase();
boolean isWriteModeLegal = writeMode.trim().toLowerCase().startsWith("insert")
|| writeMode.trim().toLowerCase().startsWith("replace")
|| writeMode.trim().toLowerCase().startsWith("update");
if (!isWriteModeLegal) {
throw DataXException.asDataXException(DBUtilErrorCode.ILLEGAL_VALUE,
String.format("您所配置的 writeMode:%s 错误. 因为DataX 目前仅支持replace,update 或 insert 方式. 请检查您的配置并作出修改.", writeMode));
}
// && writeMode.trim().toLowerCase().startsWith("replace")
String writeDataSqlTemplate;
if (forceUseUpdate || mode.startsWith("update")) {
//update只在mysql下使用
if((dataBaseType == DataBaseType.MySql || dataBaseType == DataBaseType.Tddl)){
writeDataSqlTemplate = new StringBuilder()
.append("INSERT INTO %s (").append(StringUtils.join(columnHolders, ","))
.append(") VALUES(").append(StringUtils.join(valueHolders, ","))
.append(")")
.append(onDuplicateKeyUpdateString(columnHolders))
.toString();
}if (dataBaseType == DataBaseType.Oracle) {
writeDataSqlTemplate = new StringBuilder().append(onMergeIntoDoString(writeMode, columnHolders, valueHolders)).append("INSERT (")
.append(StringUtils.join(columnHolders, ","))
.append(") VALUES(").append(StringUtils.join(valueHolders, ","))
.append(")").toString();
} else {
throw DataXException.asDataXException(DBUtilErrorCode.ILLEGAL_VALUE,
String.format("当前数据库不支持 writeMode:%s 模式.", writeMode));
}
} else {
//这里是保护,如果其他错误的使用了update,需要更换为replace
if (writeMode.trim().toLowerCase().startsWith("update")) {
writeMode = "replace";
}
writeDataSqlTemplate = new StringBuilder().append(writeMode)
.append(" INTO %s (").append(StringUtils.join(columnHolders, ","))
.append(") VALUES(").append(StringUtils.join(valueHolders, ","))
.append(")").toString();
}
return writeDataSqlTemplate;
}
public static String onMergeIntoDoString(String merge, List<String> columnHolders, List<String> valueHolders) {
String[] sArray = getStrings(merge);
StringBuilder sb = new StringBuilder();
sb.append("MERGE INTO %s A USING ( SELECT ");
boolean first = true;
boolean first1 = true;
StringBuilder str = new StringBuilder();
StringBuilder update = new StringBuilder();
for (String columnHolder : columnHolders) {
if (Arrays.asList(sArray).contains(columnHolder)) {
if (!first) {
sb.append(",");
str.append(" AND ");
} else {
first = false;
}
str.append("TMP.").append(columnHolder);
sb.append("?");
str.append(" = ");
sb.append(" AS ");
str.append("A.").append(columnHolder);
sb.append(columnHolder);
}
}
for (String columnHolder : columnHolders) {
if (!Arrays.asList(sArray).contains(columnHolder)) {
if (!first1) {
update.append(",");
} else {
first1 = false;
}
update.append(columnHolder);
update.append(" = ");
update.append("?");
}
}
sb.append(" FROM DUAL ) TMP ON (");
sb.append(str);
sb.append(" ) WHEN MATCHED THEN UPDATE SET ");
sb.append(update);
sb.append(" WHEN NOT MATCHED THEN ");
return sb.toString();
}
public static String[] getStrings(String merge) {
merge = merge.replace("update", "");
merge = merge.replace("(", "");
merge = merge.replace(")", "");
merge = merge.replace(" ", "");
return merge.split(",");
}3.在com.alibaba.datax.plugin.rdbms.writer.CommonRdbmsWriter中,修改startWriteWithConnection为以下内容
public void startWriteWithConnection(RecordReceiver recordReceiver, TaskPluginCollector taskPluginCollector, Connection connection) {
this.taskPluginCollector = taskPluginCollector;
List<String> columns = new LinkedList<>();
if (this.dataBaseType == DataBaseType.Oracle && writeMode.trim().toLowerCase().startsWith("update") ) {
String merge = this.writeMode;
String[] sArray = WriterUtil.getStrings(merge);
this.columns.forEach(column->{
if (Arrays.asList(sArray).contains(column)) {
columns.add(column);
}
});
this.columns.forEach(column->{
if (!Arrays.asList(sArray).contains(column)) {
columns.add(column);
}
});
}
columns.addAll(this.columns);
// 用于写入数据的时候的类型根据目的表字段类型转换
this.resultSetMetaData = DBUtil.getColumnMetaData(connection,
this.table, StringUtils.join(columns, ","));
// 写数据库的SQL语句
calcWriteRecordSql();
...4.在com.alibaba.datax.plugin.rdbms.writer.CommonRdbmsWriter中,修改doBatchInsert为以下内容
protected void doBatchInsert(Connection connection, List<Record> buffer)
throws SQLException
{
PreparedStatement preparedStatement = null;
try {
connection.setAutoCommit(false);
preparedStatement = connection
.prepareStatement(this.writeRecordSql);
if (this.dataBaseType == DataBaseType.Oracle && !"insert".equalsIgnoreCase(this.writeMode)) {
String merge = this.writeMode;
String[] sArray = WriterUtil.getStrings(merge);
for (Record record : buffer) {
List<Column> recordOne = new ArrayList<>();
for (int j = 0; j < this.columns.size(); j++) {
if (Arrays.asList(sArray).contains(this.columns.get(j))) {
recordOne.add(record.getColumn(j));
}
}
for (int j = 0; j < this.columns.size(); j++) {
if (!Arrays.asList(sArray).contains(this.columns.get(j))) {
recordOne.add(record.getColumn(j));
}
}
for (int j = 0; j < this.columns.size(); j++) {
recordOne.add(record.getColumn(j));
}
for (int j = 0; j < recordOne.size(); j++) {
record.setColumn(j, recordOne.get(j));
}
preparedStatement = fillPreparedStatement(
preparedStatement, record);
preparedStatement.addBatch();
}
}
else {
for (Record record : buffer) {
preparedStatement = fillPreparedStatement(
preparedStatement, record);
preparedStatement.addBatch();
}
}
preparedStatement.executeBatch();
connection.commit();
}
catch (SQLException e) {
LOG.warn("回滚此次写入, 采用每次写入一行方式提交. 因为: {}", e.getMessage());
connection.rollback();
doOneInsert(connection, buffer);
}
catch (Exception e) {
throw DataXException.asDataXException(
DBUtilErrorCode.WRITE_DATA_ERROR, e);
}
finally {
DBUtil.closeDBResources(preparedStatement, null);
}
}5.在com.alibaba.datax.plugin.rdbms.writer.CommonRdbmsWriter中,修改fillPreparedStatement为以下内容
// 直接使用了两个类变量：columnNumber,resultSetMetaData
protected PreparedStatement fillPreparedStatement(PreparedStatement preparedStatement, Record record)
throws SQLException {
for (int i = 0; i < this.resultSetMetaData.getLeft().size(); i++) {
int columnSqlType = this.resultSetMetaData.getMiddle().get(i);
String typeName = this.resultSetMetaData.getRight().get(i);
String column = this.resultSetMetaData.getLeft().get(i);
Column columnValue = record.getColumn(this.columns.indexOf(column));
preparedStatement = fillPreparedStatementColumnType(preparedStatement, i, columnSqlType, typeName,columnValue);
}
return preparedStatement;
}6.至此修改完成,进行测试
{
"core": {
"transport": {
"channel": {
"speed": {
"record": 2000
}
}
}
},
"job": {
"setting": {
"speed": {
"record": 2000,
"errorLimit": {
"record": 0,
"percentage": 0
} },
},
"content": [
{
"reader": {
"name": "oraclereader",
"parameter": {
"username": "xxx",
"password": "xxx",
"connection": [
{
"jdbcUrl": ["jdbc:oracle:thin:@xxx:1521:orcl"],
"querySql": ["select id,user_id,group_id,create_time from test1"]
}
]
}
},
"transformer": [],
"writer": {
"name": "oraclewriter",
"parameter": {
"username": "xxx",
"password": "xxx",
"postSql": [ "" ],
"preSql": [ "" ],
"column": [ "ID", "USER_ID", "GROUP_ID", "CREATE_TIME" ],
"writeMode": "update(ID)",
"connection": [
{
"jdbcUrl": "jdbc:oracle:thin:@xxx:1521:orcl",
"table": [
"TEST2"
]
}
]
}
}
}
]
}
}
