Android & PostgreSQL (application/pdf - 311.5 KB) - PGCon
Android & PostgreSQL (application/pdf - 311.5 KB) - PGCon
Android & PostgreSQL (application/pdf - 311.5 KB) - PGCon
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Execute a Query with a Bind Value<br />
Building on the previous slide, select the number of all relations from pg class:<br />
S t r i n g s q l = ”SELECT COUNT( ∗ ) FROM p g c l a s s WHERE r e l k i n d = ? ; ”<br />
PreparedStatement ps = conn . c r e a t e S t a t e m e n t ( ) ;<br />
// Bind v a r i a b l e s a r e enumerated s t a r t i n g with 1 ;<br />
ps . s e t S t r i n g ( 1 , ” r ” ) ;<br />
R e s u l t S e t r s = ps . executeQuery ( s q l ) ;<br />
r s . next ( ) ;<br />
Columns a r e enumerated s t a r t i n g with 1 .<br />
long count = r s . getLong ( 1 ) ;<br />
r s . c l o s e ( ) ;<br />
ps . c l o s e ( ) ;<br />
markwkm (<strong>PGCon</strong>2011) <strong>Android</strong> & <strong>PostgreSQL</strong> 20 May 2011 13 / 37
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