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prepare_stmt.go
db.Mux.Unlock() // prepare completed defer close(cacheStmt.prepared) // Reason why cannot lock conn.PrepareContext // suppose the maxopen is 1, g1 is creating record and g2 is querying record. // 1. g1 begin tx, g1 is requeue because of waiting for the system call, now `db.ConnPool` db.numOpen == 1. // 2. g2 select lock `conn.PrepareContext(ctx, query)`, now db.numOpen == db.maxOpen , wait for release.
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