Load Value from File: Opens a file dialog to insert a value from a file. The entire file contents are inserted into the field. Save Value to File: Saves the. The LOAD DATA statement reads rows from a text file into a table at a very high speed. The file can be read from the server host or the client host. The wizard is accessible from the object browser's context menu by right-clicking on a table and choose either Table Data Export Wizard or Table Data Import. ULTRAVNC MOUSE
Input Preprocessing. Column Value Assignment. Partitioned Table Support. Concurrency Considerations. Statement Result Information. Replication Considerations. Miscellaneous Topics. It changes the expected location of the input file; see Input File Location. It changes the statement security requirements; see Security Requirements. LOCAL works only if the server and your client both have been configured to permit it. See Section 6.
The file name must be given as a literal string. On Windows, specify backslashes in path names as forward slashes or doubled backslashes. LOAD DATA interprets all fields in the file as having the same character set, regardless of the data types of the columns into which field values are loaded. For proper interpretation of the file, you must ensure that it was written with the correct character set. It is not possible to load data files that use the ucs2 , utf16 , utf16le , or utf32 character set.
The server reads the file directly, locating it as follows:. If the file name is an absolute path name, the server uses it as given. If the file name is a relative path name with leading components, the server looks for the file relative to its data directory. If the file name has no leading components, the server looks for the file in the database directory of the default database.
The client program reads the file, locating it as follows:. If the file name is an absolute path name, the client program uses it as given. If the file name is a relative path name, the client program looks for the file relative to its invocation directory. The server creates a copy of the file in the directory where it stores temporary files.
See Section B. For a non- LOCAL load operation, the server reads a text file located on the server host, so these security requirements must be satisified:. You must have the FILE privilege. If the variable value is a nonempty directory name, the file must be located in that directory. If the variable value is empty which is insecure , the file need only be readable by the server. Because the file contents are sent over the connection by the client to the server, using LOCAL is a bit slower than when the server accesses the file directly.
On the other hand, you do not need the FILE privilege, and the file can be located in any directory the client program can access. This occurs because the server has no way to stop transmission of the file in the middle of the operation. For examples, see Column Value Assignment. See Section 8. Thus, to specify a literal backslash, you must specify two backslashes for the value to be interpreted as a single backslash. If a line does not include the prefix, the entire line is skipped. Suppose that you issue the following statement:.
The resulting rows are "abc",1 and "def",2. The third row in the file is skipped because it does not contain the prefix. If instead you tried to read the file with the statement shown following, it would not work because it instructs LOAD DATA to look for tabs between fields:. The likely result is that each input line would be interpreted as a single field.
For example, many programs can export data in comma-separated values CSV format, such that lines have fields separated by commas and enclosed within double quotation marks, with an initial line of column names. Any of the field- or line-handling options can specify an empty string ''. An example of such output using a comma as the field delimiter is shown here:.
For example, the preceding output just shown would appear as follows if the escape character is empty. Observe that the second field in the fourth line contains a comma following the quote, which erroneously appears to terminate the field:. Some two-character sequences that are exceptions, where the first character is the escape character. The rules for NULL handling are described later in this section.
It is probably not a good idea to specify an empty escape character, particularly if field values in your data contain any of the characters in the list just given. With fixed-row format, no delimiters are used between fields but you can still have a line terminator.
Instead, column values are read and written using a field width wide enough to hold all values in the field. If a line does not contain all fields, the rest of the columns are set to their default values. If you do not have a line terminator, you should set this to ''. In this case, the text file must contain all fields for each row. Fixed-row format also affects handling of NULL values, as described later. Fixed-size format does not work if you are using a multibyte character set.
This causes both NULL values and empty strings in the table to be indistinguishable when written to the file because both are written as empty strings. If you need to be able to tell the two apart when reading the file back in, you should not use fixed-row format. The following example loads all columns of the persondata table:. If you want to load only some of a table's columns, specify a column list:.
You must also specify a column list if the order of the fields in the input file differs from the order of the columns in the table. Otherwise, MySQL cannot tell how to match input fields with table columns.
With user variables, the SET clause enables you to perform preprocessing transformations on their values before assigning the result to columns. User variables in the SET clause can be used in several ways.
The following example uses the first input column directly for the value of t1. The SET clause can be used to supply values not derived from the input file. The following statement sets column3 to the current date and time:. You can also discard an input value by assigning it to a user variable and not assigning the variable to any table column:.
Assignments in the SET clause should have only column names on the left hand side of assignment operators. You can use subqueries in the right hand side of SET assignments. A subquery that returns a value to be assigned to a column may be a scalar subquery only. Also, you cannot use a subquery to select from the table that is being loaded. User variables cannot be used when loading data with fixed-row format because user variables do not have a display width.
Then the resulting row is inserted into the table. Interpretation of field values and assignment to table columns depends on these factors:. The mode can be nonstrictive, or restrictive in various ways. Businesses can use automated platforms like Hevo Data to set the integration and handle the ETL process. It helps you directly transfer data from a source of your choice to a Data Warehouse, Business Intelligence tools, or any other desired destination in a fully automated and secure manner without having to write any code and will provide you with a hassle-free experience.
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You may use these HTML tags and attributes:. Save my name, email, and website in this browser for the next time I comment. Skip to content. Driver availability : With the help of available drivers, it can easily integrate with many programming languages and modern tools.
Integration : Easy integration with operating systems. Support huge databases : MySQL provides support for large databases, up to 50 million rows or more in a table. Memory Usage : The default file size limit for a table is 4GB, but this can be increased to a limit of 8 million terabytes TB provided the operating system supports it.
This ensures efficient utilization of bandwidth on both ends. Data Transformation: It provides a simple interface to perfect, modify, and enrich the data you want to transfer. Secure: Hevo has a fault-tolerant architecture that ensures that the data is handled in a secure, consistent manner with zero data loss. Simplicity: Using Hevo is easy and intuitive, ensuring that your data is exported in just a few clicks.
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