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11.5.7 Populating Spatial Columns

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After you have created spatial columns, you can populate them with spatial data.

Values should be stored in internal geometry format, but you can convert them to that format from either Well-Known Text (WKT) or Well-Known Binary (WKB) format. The following examples demonstrate how to insert geometry values into a table by converting WKT values to internal geometry format:

The following examples insert more complex geometries into the table:

  1. SET @g = 'LINESTRING(0 0,1 1,2 2)';
  2. INSERT INTO geom VALUES (ST_GeomFromText(@g));
  3.  
  4. SET @g = 'POLYGON((0 0,10 0,10 10,0 10,0 0),(5 5,7 5,7 7,5 7, 5 5))';
  5. INSERT INTO geom VALUES (ST_GeomFromText(@g));
  6.  
  7. SET @g =
  8. 'GEOMETRYCOLLECTION(POINT(1 1),LINESTRING(0 0,1 1,2 2,3 3,4 4))';
  9. INSERT INTO geom VALUES (ST_GeomFromText(@g));

The preceding examples use ST_GeomFromText() to create geometry values. You can also use type-specific functions:

  1. SET @g = 'POINT(1 1)';
  2. INSERT INTO geom VALUES (ST_PointFromText(@g));
  3.  
  4. SET @g = 'LINESTRING(0 0,1 1,2 2)';
  5. INSERT INTO geom VALUES (ST_LineStringFromText(@g));
  6.  
  7. SET @g = 'POLYGON((0 0,10 0,10 10,0 10,0 0),(5 5,7 5,7 7,5 7, 5 5))';
  8. INSERT INTO geom VALUES (ST_PolygonFromText(@g));
  9.  
  10. SET @g =
  11. 'GEOMETRYCOLLECTION(POINT(1 1),LINESTRING(0 0,1 1,2 2,3 3,4 4))';
  12. INSERT INTO geom VALUES (ST_GeomCollFromText(@g));

A client application program that wants to use WKB representations of geometry values is responsible for sending correctly formed WKB in queries to the server. There are several ways to satisfy this requirement. For example:


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Document created the 26/06/2006, last modified the 26/10/2018
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References

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