ConvertJSONToSQL

Description:

Converts a JSON-formatted FlowFile into an UPDATE, INSERT, or DELETE SQL statement. The incoming FlowFile is expected to be "flat" JSON message, meaning that it consists of a single JSON element and each field maps to a simple type. If a field maps to a JSON object, that JSON object will be interpreted as Text. If the input is an array of JSON elements, each element in the array is output as a separate FlowFile to the 'sql' relationship. Upon successful conversion, the original FlowFile is routed to the 'original' relationship and the SQL is routed to the 'sql' relationship.

Tags:

json, sql, database, rdbms, insert, update, delete, relational, flat

Properties:

In the list below, the names of required properties appear in bold. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the NiFi Expression Language.

Display Name	API Name	Default Value	Allowable Values	Description
JDBC Connection Pool	JDBC Connection Pool		Controller Service API: DBCPService Implementations: DBCPConnectionPool PostgreSQLConnectionPool DBCPConnectionPoolLookup HikariCPConnectionPool Hive3ConnectionPool RedshiftConnectionPool SnowflakeComputingConnectionPool HiveConnectionPool HadoopDBCPConnectionPool	Specifies the JDBC Connection Pool to use in order to convert the JSON message to a SQL statement. The Connection Pool is necessary in order to determine the appropriate database column types.
Statement Type	Statement Type		UPDATE INSERT DELETE Use statement.type Attribute	Specifies the type of SQL Statement to generate
Table Name	Table Name			The name of the table that the statement should update Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)
Catalog Name	Catalog Name			The name of the catalog that the statement should update. This may not apply for the database that you are updating. In this case, leave the field empty Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)
Schema Name	Schema Name			The name of the schema that the table belongs to. This may not apply for the database that you are updating. In this case, leave the field empty Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)
Translate Field Names	Translate Field Names	true	true false	If true, the Processor will attempt to translate JSON field names into the appropriate column names for the table specified. If false, the JSON field names must match the column names exactly, or the column will not be updated
Unmatched Field Behavior	Unmatched Field Behavior	Ignore Unmatched Fields	Ignore Unmatched Fields Fail	If an incoming JSON element has a field that does not map to any of the database table's columns, this property specifies how to handle the situation
Unmatched Column Behavior	Unmatched Column Behavior	Fail on Unmatched Columns	Ignore Unmatched Columns Warn on Unmatched Columns Fail on Unmatched Columns	If an incoming JSON element does not have a field mapping for all of the database table's columns, this property specifies how to handle the situation
Update Keys	Update Keys			A comma-separated list of column names that uniquely identifies a row in the database for UPDATE statements. If the Statement Type is UPDATE and this property is not set, the table's Primary Keys are used. In this case, if no Primary Key exists, the conversion to SQL will fail if Unmatched Column Behaviour is set to FAIL. This property is ignored if the Statement Type is INSERT Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)
Quote Column Identifiers	jts-quoted-identifiers	false	true false	Enabling this option will cause all column names to be quoted, allowing you to use reserved words as column names in your tables.
Quote Table Identifiers	jts-quoted-table-identifiers	false	true false	Enabling this option will cause the table name to be quoted to support the use of special characters in the table name
SQL Parameter Attribute Prefix	jts-sql-param-attr-prefix	sql		The string to be prepended to the outgoing flow file attributes, such as <sql>.args.1.value, where <sql> is replaced with the specified value Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)
Table Schema Cache Size	table-schema-cache-size	100		Specifies how many Table Schemas should be cached

Relationships:

Name	Description
sql	A FlowFile is routed to this relationship when its contents have successfully been converted into a SQL statement
failure	A FlowFile is routed to this relationship if it cannot be converted into a SQL statement. Common causes include invalid JSON content or the JSON content missing a required field (if using an INSERT statement type).
original	When a FlowFile is converted to SQL, the original JSON FlowFile is routed to this relationship

Reads Attributes:

None specified.

Writes Attributes:

Name	Description
mime.type	Sets mime.type of FlowFile that is routed to 'sql' to 'text/plain'.
<sql>.table	Sets the <sql>.table attribute of FlowFile that is routed to 'sql' to the name of the table that is updated by the SQL statement. The prefix for this attribute ('sql', e.g.) is determined by the SQL Parameter Attribute Prefix property.
<sql>.catalog	If the Catalog name is set for this database, specifies the name of the catalog that the SQL statement will update. If no catalog is used, this attribute will not be added. The prefix for this attribute ('sql', e.g.) is determined by the SQL Parameter Attribute Prefix property.
fragment.identifier	All FlowFiles routed to the 'sql' relationship for the same incoming FlowFile (multiple will be output for the same incoming FlowFile if the incoming FlowFile is a JSON Array) will have the same value for the fragment.identifier attribute. This can then be used to correlate the results.
fragment.count	The number of SQL FlowFiles that were produced for same incoming FlowFile. This can be used in conjunction with the fragment.identifier attribute in order to know how many FlowFiles belonged to the same incoming FlowFile.
fragment.index	The position of this FlowFile in the list of outgoing FlowFiles that were all derived from the same incoming FlowFile. This can be used in conjunction with the fragment.identifier and fragment.count attributes to know which FlowFiles originated from the same incoming FlowFile and in what order the SQL FlowFiles were produced
<sql>.args.N.type	The output SQL statements are parametrized in order to avoid SQL Injection Attacks. The types of the Parameters to use are stored in attributes named <sql>.args.1.type, <sql>.args.2.type, <sql>.args.3.type, and so on. The type is a number representing a JDBC Type constant. Generally, this is useful only for software to read and interpret but is added so that a processor such as PutSQL can understand how to interpret the values. The prefix for this attribute ('sql', e.g.) is determined by the SQL Parameter Attribute Prefix property.
<sql>.args.N.value	The output SQL statements are parametrized in order to avoid SQL Injection Attacks. The values of the Parameters to use are stored in the attributes named sql.args.1.value, sql.args.2.value, sql.args.3.value, and so on. Each of these attributes has a corresponding <sql>.args.N.type attribute that indicates how the value should be interpreted when inserting it into the database.The prefix for this attribute ('sql', e.g.) is determined by the SQL Parameter Attribute Prefix property.

State management:

This component does not store state.

Restricted:

This component is not restricted.

Input requirement:

This component requires an incoming relationship.

System Resource Considerations: